KR20170086784A - Fabrication of wireless hydrogen gas sensor based on Pt/graphene-immobilized radio frequency identification tag - Google Patents
Fabrication of wireless hydrogen gas sensor based on Pt/graphene-immobilized radio frequency identification tag Download PDFInfo
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- KR20170086784A KR20170086784A KR1020160006215A KR20160006215A KR20170086784A KR 20170086784 A KR20170086784 A KR 20170086784A KR 1020160006215 A KR1020160006215 A KR 1020160006215A KR 20160006215 A KR20160006215 A KR 20160006215A KR 20170086784 A KR20170086784 A KR 20170086784A
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- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 114
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 61
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims abstract description 566
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 465
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 464
- 229910052697 platinum Inorganic materials 0.000 claims abstract description 283
- 239000002131 composite material Substances 0.000 claims abstract description 169
- 239000007864 aqueous solution Substances 0.000 claims abstract description 138
- 238000000034 method Methods 0.000 claims abstract description 103
- FBEIPJNQGITEBL-UHFFFAOYSA-J tetrachloroplatinum Chemical compound Cl[Pt](Cl)(Cl)Cl FBEIPJNQGITEBL-UHFFFAOYSA-J 0.000 claims abstract description 70
- 239000000126 substance Substances 0.000 claims abstract description 47
- 230000003647 oxidation Effects 0.000 claims abstract description 44
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 44
- 238000004528 spin coating Methods 0.000 claims abstract description 12
- 239000002245 particle Substances 0.000 claims description 85
- OAKJQQAXSVQMHS-UHFFFAOYSA-N Hydrazine Chemical compound NN OAKJQQAXSVQMHS-UHFFFAOYSA-N 0.000 claims description 64
- 239000000243 solution Substances 0.000 claims description 59
- 238000002156 mixing Methods 0.000 claims description 32
- 239000012279 sodium borohydride Substances 0.000 claims description 30
- 229910000033 sodium borohydride Inorganic materials 0.000 claims description 30
- 239000002904 solvent Substances 0.000 claims description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 28
- 239000003638 chemical reducing agent Substances 0.000 claims description 20
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 2
- 239000012280 lithium aluminium hydride Substances 0.000 claims description 2
- -1 lithium aluminum hydride Chemical compound 0.000 claims description 2
- 239000012153 distilled water Substances 0.000 claims 1
- 238000005421 electrostatic potential Methods 0.000 claims 1
- 229910052705 radium Inorganic materials 0.000 claims 1
- HCWPIIXVSYCSAN-UHFFFAOYSA-N radium atom Chemical compound [Ra] HCWPIIXVSYCSAN-UHFFFAOYSA-N 0.000 claims 1
- 238000009434 installation Methods 0.000 abstract description 7
- 230000008901 benefit Effects 0.000 abstract description 4
- 239000002086 nanomaterial Substances 0.000 abstract description 3
- 230000035945 sensitivity Effects 0.000 abstract description 2
- 102000004190 Enzymes Human genes 0.000 abstract 1
- 108090000790 Enzymes Proteins 0.000 abstract 1
- 230000001747 exhibiting effect Effects 0.000 abstract 1
- 238000007781 pre-processing Methods 0.000 abstract 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 54
- 238000006243 chemical reaction Methods 0.000 description 54
- 239000000203 mixture Substances 0.000 description 54
- 239000007789 gas Substances 0.000 description 31
- 230000006835 compression Effects 0.000 description 27
- 238000007906 compression Methods 0.000 description 27
- 230000004044 response Effects 0.000 description 27
- 238000003756 stirring Methods 0.000 description 27
- 239000001257 hydrogen Substances 0.000 description 10
- 229910052739 hydrogen Inorganic materials 0.000 description 10
- 230000008859 change Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/403—Cells and electrode assemblies
- G01N27/406—Cells and probes with solid electrolytes
- G01N27/407—Cells and probes with solid electrolytes for investigating or analysing gases
- G01N27/4073—Composition or fabrication of the solid electrolyte
- G01N27/4074—Composition or fabrication of the solid electrolyte for detection of gases other than oxygen
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
- G01N33/005—H2
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- G06—COMPUTING; CALCULATING OR COUNTING
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- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
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Abstract
The present invention relates to a method of manufacturing a hydrogen gas sensor using a radio frequency identification tag having a platinum / graphene composite attached thereto, wherein a platinum tetrachloride aqueous solution is mixed with an aqueous solution of an oxidized graphene, The present invention provides a method of manufacturing a platinum / graphene composite manufactured through a chemical oxidation method and a method for manufacturing a smart sensor for sensing hydrogen gas by fixing the nanomaterial by spin coating on a flexible radio frequency identification tag.
According to the present invention, it is possible to detect hydrogen gas without performing a complicated preprocessing process such as an enzyme. In addition, it has advantages such as inconspicuous installation environment, high density, and low installation cost compared with the case of using a hydrogen gas sensor using a general electrode, and by using a passive sensor tag which does not require a battery, It is possible to operate without the need. In addition, the hydrogen gas sensor using the radio frequency identification tag with the platinum / graphene composite attached thereto, which can be manufactured according to the present invention, has a high sensitivity to detect hydrogen gas at a very low concentration and a high performance Thereby exhibiting excellent reusability.
Description
The present invention relates to a method of manufacturing a hydrogen gas sensor using a radio frequency identification tag having a platinum / graphene composite attached thereto, wherein a platinum tetrachloride aqueous solution is mixed with an aqueous solution of an oxidized graphene, A method of manufacturing a platinum / graphene composite manufactured through a chemical oxidation method, and a method of manufacturing a radio frequency identification tag sensor for hydrogen gas detection wherein the nanomaterial is spin-coated on a flexible radio frequency identification tag, present.
Techniques to detect dangerous and flammable materials are used in a variety of applications, including disaster prevention, health promotion, and improved traceable systems. Sensors based on nanoscale materials can act as highly sensitive sensors capable of selectively sensing a substance based on the surface area increase due to the small size of the substance. Due to these excellent potentials, various studies have been made to apply sensor materials to electrical circuits.
Research on applying nanoscale sensors to wireless networks has received a lot of attention recently. Wireless sensor features such as inconspicuous installation environment, high density, and low installation cost, It can be used in various fields. Of the wireless sensing systems, sensors based on radio frequency identification tags are becoming popular because of their simple and wide range of sensing performance. The sensor system based on radio frequency identification tag consists of two simple structures: a sensor tag, which is a signal transmitter, and a reader, which is a signal receiver. There are two types of sensor tags: active sensor tag, which requires a battery, and passive sensor tag, which does not require a battery. Passive sensor tags have advantages in terms of long lifetime, small size, and cost reduction, but they have a shorter sensing distance than active sensor tags. Recently, sensor research using ultra-high frequency passive radio frequency identification (RFID) tags is under way.
Hydrogen gas is used in various industrial applications such as fossil fuel production, chemical composite synthesis, power plant operation, and fuel cells. Recently, hydrogen energy is attracting attention as a next generation application such as hydrogen-based low-carbon emission transportation. However, due to the wide explosion range from 4 to 75 volume percent, safe storage of hydrogen is essential. Therefore, a sensor that detects the degree of exposure of hydrogen and reacts quickly is needed. In addition, a hydrogen sensing wireless sensor system that covers the entire city is also needed.
Therefore, it is strongly required to develop a technology for manufacturing a radio frequency identification sensor tag based on a nanomaterial and to develop a technology for manufacturing a highly sensitive hydrogen sensor wireless sensor system using the same.
An object of the present invention is to provide a platinum / graphene composite prepared by mixing a platinum tetrachloride aqueous solution with an aqueous solution of a graphene oxide, attaching platinum particles using a reducing agent, and finally producing a platinum / graphene composite by a chemical oxidation method, And a method of fabricating a radio frequency identification sensor tag for hydrogen gas detection in which a flexible radio frequency identification tag is spin-coated and fixed.
The present invention relates to a method for producing a platinum / graphene composite by mixing a platinum tetrachloride aqueous solution with an aqueous solution of a graphene oxide, attaching platinum particles using a reducing agent, and finally producing a platinum / graphene composite by a chemical oxidation method, And a method of manufacturing a radio frequency identification sensor tag for hydrogen gas detection, which is fixed by spin coating on a radio frequency identification tag.
The present invention relates to a method for producing reduced graphene grains having platinum particles attached thereto and fixing the composite to a radio frequency identification tag to construct a sensor and to detect hydrogen in real time using the sensor.
The step of fabricating the hydrogen gas sensor using the radio frequency identification tag with the platinum /
(A) Mixing platinum tetrachloride accepting nuclei with an aqueous solution of an oxidized graphene and preparing a graphene oxide having platinum particles attached thereto using a reducing agent; And
(B) Preparing a platinum / graphene composite finally by using the chemical oxidation method of the graphene oxide having the platinum particles attached thereto; And
(C) Fabricating a radio frequency identification sensor tag by uniformly arranging the platinum / graphene complex on a radio frequency identification tag using spin coating; And
(D) And establishing a radio frequency identification sensor system for sensing hydrogen gas using the radio frequency identification sensor tag and providing a sensing means using the radio frequency identification sensor system. And a step of manufacturing a hydrogen gas sensor using the tag.
The manufacture of a hydrogen gas sensor using a radio frequency identification tag with a platinum / graphene complex attached thereto according to the present invention is an entirely new method of detecting a hydrogen gas. The platinum particle is introduced on the graphene to perform a complicated pre- It is possible to detect hydrogen gas without.
In addition, it has advantages such as inconspicuous installation environment, high density, and low installation cost compared with the case of using a hydrogen gas sensor using a general electrode, and by using a passive sensor tag which does not require a battery, It is possible to operate without the need.
The hydrogen gas sensor using the radio frequency identification tag with the platinum / graphene composite exhibits excellent sensitivity to detect hydrogen gas at a very low concentration and excellent reusability in which the performance is maintained for several times of reuse.
1 is a transmission electron microscope (TEM) photograph of a platinum / graphene composite.
FIG. 2 is a scanning electron microscope (SEM) photograph of a manufacturing process of a radio frequency identification sensor tag having a platinum / graphene complex attached thereto and a sensing range in which a platinum / graphene composite is spin-coated in a radio frequency identification sensor tag.
3 is an actual photograph of a radio frequency identification sensor tag to which a platinum / graphene complex is attached.
4 is a schematic diagram of a radio frequency identification sensor system.
FIG. 5 is a graph showing changes in the amount of reflected waves and the degree of change in the reflected image when the radio frequency identification sensor tag is exposed to different concentrations of hydrogen gas for 2 minutes.
6 is a graph showing changes in the amount of reflected waves and the degree of change in the reflected image when the radio frequency identification sensor tag is exposed to different concentrations of hydrogen gas for 2 minutes.
7 is a graph showing changes in the amount of reflected waves and the degree of change in the reflected image when the radio frequency identification sensor tag is exposed to different concentrations of hydrogen gas for 2 minutes.
Unless otherwise specified herein, numerical ranges such as temperature, content, size and the like refer to ranges within which the manufacturing method of the present invention can be optimized.
Step (A) is a step of mixing an aqueous solution of platinum tetrachloride into an aqueous solution of a graphene oxide and then preparing a graphene oxide having platinum particles attached thereto using a reducing agent.
The amount of the graphene oxide dispersed in the oxidized graphene aqueous solution is preferably from 0.1 to 2 wt%, but is not particularly limited.
When the aqueous solution of platinum tetrachloride is mixed with the aqueous solution containing the graphene oxide dispersed therein, the concentration of the platinum particles can be controlled by changing the concentration of the aqueous solution of platinum tetrachloride from 0.1 to 20 mmol. The concentration conditions are not limited to these ranges and may be smaller or larger than the above range.
In preparing the graphene oxide having platinum particles attached thereto, examples of the reducing agent include sodium borohydride, lithium aluminum hydride, hydrazine and the like. Among them, sodium borohydride is preferably used, but not limited thereto.
The amount of the reducing agent used is in the range of 0.1 to 10 mmol when preparing the graphene oxide with platinum particles. When using a reducing agent, the temperature should be in the range of 1 to 100 ° C. The use time of the reducing agent should be in the range of 5 minutes to 2 hours. The amount, temperature, and time conditions of the reducing agent are not limited to these ranges and may be smaller or larger than the above ranges.
The step (B) is a step of finally producing a platinum / graphene composite by using a chemical oxidation method of the graphene oxide grafted with the platinum particles.
During the preparation of the platinum / graphene complex, the oxidized graphene with platinum particles is chemically oxidized to form reduced oxidized graphene with platinum particles attached thereto.
As a method of using a reducing agent, there are hydrazine, ammonia water and the like. Among them, hydrazine is preferably used, but not limited thereto. Do not.
Step (C) is a step of uniformly arranging the platinum / graphene complex on a radio frequency identification tag using spin coating to manufacture a radio frequency identification sensor tag.
A radio frequency identification tag used for spin coating the platinum / graphene complex uses a passive microwave radio frequency identification tag, and the passive microwave radio frequency identification tag is composed of an IC chip having an antenna and a microcontroller.
The radio frequency identification tag used to spin-coat the platinum / graphene complexes compresses all areas except the 3 x 6 mm 2 area with plastic tape.
When the platinum / graphene composite is spin-coated onto the radio frequency identification tag, the amount of platinum / graphene complex is used in the range of 10 to 100 μL. Also, the concentration of the platinum / graphene complex should be in the range of 0.01 to 1 wt%. The amount and concentration of the platinum / graphene complex is not limited to these ranges and may be smaller or larger than the above range.
When the platinum / graphene composite is spin-coated on the radio frequency identification tag, the number of revolutions per minute is in the range of 200 to 2000 rpm. The rotation time should be in the range of 10 to 100 seconds. The number of revolutions per minute of the spin coating and the rotation time are not limited to these ranges and may be smaller or larger than the above range.
Wherein the step (D) comprises constructing a radio frequency identification sensor system for sensing hydrogen gas using the radio frequency identification sensor tag and providing the sensing means using the radio frequency identification sensor system. And fabricating a hydrogen gas sensor using the attached radio frequency identification tag.
In building a radio frequency identification sensor system, the radio frequency identification sensor system comprises a radio frequency identification antenna and a network analyzer connected thereto. The flow rate of the gas is controlled by a mass flow controller (MFC) . The radio frequency identification sensor system is not limited to these machines and may be smaller or larger than the above range.
When detecting the hydrogen gas using the radio frequency identification sensor system, the network analyzer of the radio frequency identification sensor system outputs the status indicating signal P1. At this time, when the radio frequency identification sensor tag is activated by the hydrogen gas And the backscattered wave P2 is reflected by the radio frequency identification antenna. The reflected wave is read from the network analyzer to detect hydrogen gas. The path for sensing the hydrogen gas using the radio frequency identification sensor system is not limited to this path but may be more various than the path.
In the implementation of the present invention, a hydrogen gas sensor using a radio frequency identification tag with a platinum / graphene complex attached thereto can detect hydrogen gas in a range of 1 to 10,000 ppm at room temperature without a separate pre- Can be detected as a fast reaction time. In addition, the hydrogen gas sensor using the radio frequency identification tag having the platinum / graphene complex attached thereto is less conspicuous than when using a hydrogen gas sensor using a common electrode, and has a high density and a low installation cost And has the advantage of being able to operate without an external energy source by using a passive sensor tag which does not require a battery.
[Example]
Hereinafter, specific examples of the present invention will be described with reference to examples, but the scope of the present invention is not limited thereto.
According to the improved Hummers method, graphene oxide is prepared and 0.25 wt% aqueous solution of graphene oxide is prepared using water as a solvent. To prepare the graphene oxide having the platinum particles attached thereto, 0.1 mmol of the aqueous solution of platinum tetrachloride was added to the prepared aqueous solution of the oxidized graphene, followed by stirring and mixing. 1 mmol of sodium borohydride was added to the resulting mixture, and the mixture was stirred at 25 ° C for one hour to obtain a grafted oxide graphene. When 0.1 wt% hydrazine solution was added to the prepared graphene oxide graphene by chemical oxidation method and then mixed at 95 ° C for one hour, reduced graphene graphene with attached platinum particles was formed To prepare a platinum / graphene composite. In order to manufacture a radio frequency identification sensor tag having a platinum / graphene composite, a passive microwave radio frequency identification tag composed of a micropatterned dipole tag antenna and an IC chip having a built-in microcontroller located at the center thereof is used, Except for an area of 3 x 6 mm 2 on the pattern, it is compression coated with plastic tape. A 50 μL ethanol solution containing 0.1 wt% of the platinum / graphene composite prepared by conducting 0.1 mmol of platinum tetrachloride aqueous solution on the exposed portion of the antenna pattern is dropped and spin-coated at 1000 rpm for 45 seconds. A radio frequency identification sensor system is constructed using a radio frequency identification sensor tag having a platinum / graphene composite attached thereto. The radio frequency identification sensor system comprises a radio frequency identification antenna and a network analyzer connected thereto. The flow rate of the gas is controlled by a mass flow controller (MFC). Sensor response was measured at room temperature using a radio frequency identification sensor system, which detects hydrogen gas at concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm. After placing the radio frequency identification tag with the platinum / graphene composite in the vacuum chamber, the tag and the distance between the antenna and the sensor were set to 10 cm, and hydrogen gas at concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm Expose for 2 minutes to see if a sensing reaction occurs. The sensing reaction is indicated by back scattering between the tag of the sensor and the network analyzer to which the antenna is connected.
According to the improved Hummers method, graphene oxide is prepared and 0.25 wt% aqueous solution of graphene oxide is prepared using water as a solvent. To prepare the graphene oxide having the platinum particles attached thereto, 1 mmol of the aqueous solution of platinum tetrachloride was added to the prepared aqueous solution of the graphene oxide, followed by stirring and mixing. 1 mmol of sodium borohydride was added to the resulting mixture, and the mixture was stirred at 25 ° C for one hour to obtain a grafted oxide graphene. When 0.1 wt% hydrazine solution was added to the prepared graphene oxide graphene by chemical oxidation method and then mixed at 95 ° C for one hour, reduced graphene graphene with attached platinum particles was formed To prepare a platinum / graphene composite. In order to manufacture a radio frequency identification sensor tag having a platinum / graphene composite, a passive microwave radio frequency identification tag composed of a micropatterned dipole tag antenna and an IC chip having a built-in microcontroller located at the center thereof is used, Except for an area of 3 x 6 mm 2 on the pattern, it is compression coated with plastic tape. The 50 μL ethanol solution containing 0.1 wt% of the platinum / graphene composite prepared by conducting the concentration of the platinum tetrachloride aqueous solution at 1 mmol of the antenna pattern exposed portion is dropped and spin-coated at 1000 rpm for 45 seconds. A radio frequency identification sensor system is constructed using a radio frequency identification sensor tag having a platinum / graphene composite attached thereto. The radio frequency identification sensor system comprises a radio frequency identification antenna and a network analyzer connected thereto. The flow rate of the gas is controlled by a mass flow controller (MFC). Sensor response was measured at room temperature using a radio frequency identification sensor system, which detects hydrogen gas at concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm. After placing the radio frequency identification tag with the platinum / graphene composite in the vacuum chamber, the tag and the distance between the antenna and the sensor were set to 10 cm, and hydrogen gas at concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm Expose for 2 minutes to see if a sensing reaction occurs. The sensing reaction is indicated by back scattering between the tag of the sensor and the network analyzer to which the antenna is connected.
According to the improved Hummers method, graphene oxide is prepared and 0.25 wt% aqueous solution of graphene oxide is prepared using water as a solvent. To prepare the graphene oxide having the platinum particles attached thereto, 10 mmol of the aqueous solution of platinum tetrachloride was added to the prepared aqueous solution of the oxidized graphene, followed by stirring and mixing. 1 mmol of sodium borohydride was added to the resulting mixture, and the mixture was stirred at 25 ° C for one hour to obtain a grafted oxide graphene. When 0.1 wt% hydrazine solution was added to the prepared graphene oxide graphene by chemical oxidation method and then mixed at 95 ° C for one hour, reduced graphene graphene with attached platinum particles was formed To prepare a platinum / graphene composite. In order to manufacture a radio frequency identification sensor tag having a platinum / graphene composite, a passive microwave radio frequency identification tag composed of a micropatterned dipole tag antenna and an IC chip having a built-in microcontroller located at the center thereof is used, Except for an area of 3 x 6 mm 2 on the pattern, it is compression coated with plastic tape. The 50 μL ethanol solution containing 0.1 wt% of the platinum / graphene composite prepared by performing the concentration of the platinum tetrachloride aqueous solution at 10 mmol on the exposed portion of the antenna pattern was dropped and spin-coated at 1000 rpm for 45 seconds. A radio frequency identification sensor system is constructed using a radio frequency identification sensor tag having a platinum / graphene composite attached thereto. The radio frequency identification sensor system comprises a radio frequency identification antenna and a network analyzer connected thereto. The flow rate of the gas is controlled by a mass flow controller (MFC). Sensor response was measured at room temperature using a radio frequency identification sensor system, which detects hydrogen gas at concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm. After placing the radio frequency identification tag with the platinum / graphene composite in the vacuum chamber, the tag and the distance between the antenna and the sensor were set to 10 cm, and hydrogen gas at concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm Expose for 2 minutes to see if a sensing reaction occurs. The sensing reaction is indicated by back scattering between the tag of the sensor and the network analyzer to which the antenna is connected.
According to the improved Hummers method, graphene oxide is prepared and 0.25 wt% aqueous solution of graphene oxide is prepared using water as a solvent. To prepare the graphene oxide having the platinum particles attached thereto, 0.1 mmol of the aqueous solution of platinum tetrachloride was added to the prepared aqueous solution of the oxidized graphene, followed by stirring and mixing. 10 mmol of sodium borohydride was added to the mixture, and the mixture was stirred at a temperature of 25 ° C for one hour to obtain a graphene oxide grafted with platinum particles. When 0.1 wt% hydrazine solution was added to the prepared graphene oxide graphene by chemical oxidation method and then mixed at 95 ° C for one hour, reduced graphene graphene with attached platinum particles was formed To prepare a platinum / graphene composite. In order to manufacture a radio frequency identification sensor tag having a platinum / graphene composite, a passive microwave radio frequency identification tag composed of a micropatterned dipole tag antenna and an IC chip having a built-in microcontroller at its center is used, Except for an area of 3 x 6 mm 2 on the pattern, it is compression coated with plastic tape. A 50 μL ethanol solution containing 0.1 wt% of the platinum / graphene composite prepared by conducting 0.1 mmol of platinum tetrachloride aqueous solution on the exposed portion of the antenna pattern is dropped and spin-coated at 1000 rpm for 45 seconds. A radio frequency identification sensor system is constructed using a radio frequency identification sensor tag having a platinum / graphene composite attached thereto. The radio frequency identification sensor system comprises a radio frequency identification antenna and a network analyzer connected thereto. The flow rate of the gas is controlled by a mass flow controller (MFC). Sensor response was measured at room temperature using a radio frequency identification sensor system, which detects hydrogen gas at concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm. After placing the radio frequency identification tag with the platinum / graphene composite in the vacuum chamber, the tag and the distance between the antenna and the sensor were set to 10 cm, and hydrogen gas at concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm Expose for 2 minutes to see if a sensing reaction occurs. The sensing reaction is indicated by back scattering between the tag of the sensor and the network analyzer to which the antenna is connected.
According to the improved Hummers method, graphene oxide is prepared and 0.25 wt% aqueous solution of graphene oxide is prepared using water as a solvent. To prepare the graphene oxide having the platinum particles attached thereto, 1 mmol of the aqueous solution of platinum tetrachloride was added to the prepared aqueous solution of the graphene oxide, followed by stirring and mixing. 10 mmol of sodium borohydride was added to the mixture, and the mixture was stirred at a temperature of 25 ° C for one hour to obtain a graphene oxide grafted with platinum particles. When 0.1 wt% hydrazine solution was added to the prepared graphene oxide graphene by chemical oxidation method and then mixed at 95 ° C for one hour, reduced graphene graphene with attached platinum particles was formed To prepare a platinum / graphene composite. In order to manufacture a radio frequency identification sensor tag having a platinum / graphene composite, a passive microwave radio frequency identification tag composed of a micropatterned dipole tag antenna and an IC chip having a built-in microcontroller located at the center thereof is used, Except for an area of 3 x 6 mm 2 on the pattern, it is compression coated with plastic tape. The 50 μL ethanol solution containing 0.1 wt% of the platinum / graphene composite prepared by conducting the concentration of the platinum tetrachloride aqueous solution at 1 mmol of the antenna pattern exposed portion is dropped and spin-coated at 1000 rpm for 45 seconds. A radio frequency identification sensor system is constructed using a radio frequency identification sensor tag having a platinum / graphene composite attached thereto. The radio frequency identification sensor system comprises a radio frequency identification antenna and a network analyzer connected thereto. The flow rate of the gas is controlled by a mass flow controller (MFC). Sensor response was measured at room temperature using a radio frequency identification sensor system, which detects hydrogen gas at concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm. After placing the radio frequency identification tag with the platinum / graphene composite in the vacuum chamber, the tag and the distance between the antenna and the sensor were set to 10 cm, and hydrogen gas at concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm Expose for 2 minutes to see if a sensing reaction occurs. The sensing reaction is indicated by back scattering between the tag of the sensor and the network analyzer to which the antenna is connected.
According to the improved Hummers method, graphene oxide is prepared and 0.25 wt% aqueous solution of graphene oxide is prepared using water as a solvent. To prepare the graphene oxide having the platinum particles attached thereto, 10 mmol of the aqueous solution of platinum tetrachloride was added to the prepared aqueous solution of the oxidized graphene, followed by stirring and mixing. 10 mmol of sodium borohydride was added to the mixture, and the mixture was stirred at a temperature of 25 ° C for one hour to obtain a graphene oxide grafted with platinum particles. When 0.1 wt% hydrazine solution was added to the prepared graphene oxide graphene by chemical oxidation method and then mixed at 95 ° C for one hour, reduced graphene graphene with attached platinum particles was formed To prepare a platinum / graphene composite. In order to manufacture a radio frequency identification sensor tag having a platinum / graphene composite, a passive microwave radio frequency identification tag composed of a micropatterned dipole tag antenna and an IC chip having a built-in microcontroller located at the center thereof is used, Except for an area of 3 x 6 mm 2 on the pattern, it is compression coated with plastic tape. The 50 μL ethanol solution containing 0.1 wt% of the platinum / graphene composite prepared by performing the concentration of the platinum tetrachloride aqueous solution at 10 mmol on the exposed portion of the antenna pattern was dropped and spin-coated at 1000 rpm for 45 seconds. A radio frequency identification sensor system is constructed using a radio frequency identification sensor tag having a platinum / graphene composite attached thereto. The radio frequency identification sensor system comprises a radio frequency identification antenna and a network analyzer connected thereto. The flow rate of the gas is controlled by a mass flow controller (MFC). Sensor response was measured at room temperature using a radio frequency identification sensor system, which detects hydrogen gas at concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm. After placing the radio frequency identification tag with the platinum / graphene composite in the vacuum chamber, the tag and the distance between the antenna and the sensor were set to 10 cm, and hydrogen gas at concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm Expose for 2 minutes to see if a sensing reaction occurs. The sensing reaction is indicated by back scattering between the tag of the sensor and the network analyzer to which the antenna is connected.
According to the improved Hummers method, graphene oxide is prepared and 0.25 wt% aqueous solution of graphene oxide is prepared using water as a solvent. To prepare the graphene oxide having the platinum particles attached thereto, 0.1 mmol of the aqueous solution of platinum tetrachloride was added to the prepared aqueous solution of the oxidized graphene, followed by stirring and mixing. 1 mmol of sodium borohydride was added to the mixture, and the mixture was stirred at a temperature of 50 ° C for one hour to obtain a graphene oxide grafted with platinum particles. When 0.1 wt% hydrazine solution was added to the prepared graphene oxide graphene by chemical oxidation method and then mixed at 95 ° C for one hour, reduced graphene graphene with attached platinum particles was formed To prepare a platinum / graphene composite. In order to manufacture a radio frequency identification sensor tag having a platinum / graphene composite, a passive microwave radio frequency identification tag composed of a micropatterned dipole tag antenna and an IC chip having a built-in microcontroller located at the center thereof is used, Except for an area of 3 x 6 mm 2 on the pattern, it is compression coated with plastic tape. A 50 μL ethanol solution containing 0.1 wt% of the platinum / graphene composite prepared by conducting 0.1 mmol of platinum tetrachloride aqueous solution on the exposed portion of the antenna pattern is dropped and spin-coated at 1000 rpm for 45 seconds. A radio frequency identification sensor system is constructed using a radio frequency identification sensor tag having a platinum / graphene composite attached thereto. The radio frequency identification sensor system comprises a radio frequency identification antenna and a network analyzer connected thereto. The flow rate of the gas is controlled by a mass flow controller (MFC). Sensor response was measured at room temperature using a radio frequency identification sensor system, which detects hydrogen gas at concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm. After placing the radio frequency identification tag with the platinum / graphene composite in the vacuum chamber, the tag and the distance between the antenna and the sensor were set to 10 cm, and hydrogen gas at concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm Expose for 2 minutes to see if a sensing reaction occurs. The sensing reaction is indicated by back scattering between the tag of the sensor and the network analyzer to which the antenna is connected.
According to the improved Hummers method, graphene oxide is prepared and 0.25 wt% aqueous solution of graphene oxide is prepared using water as a solvent. To prepare the graphene oxide having the platinum particles attached thereto, 1 mmol of the aqueous solution of platinum tetrachloride was added to the prepared aqueous solution of the graphene oxide, followed by stirring and mixing. 1 mmol of sodium borohydride was added to the mixture, and the mixture was stirred at a temperature of 50 ° C for one hour to obtain a graphene oxide grafted with platinum particles. When 0.1 wt% hydrazine solution was added to the prepared graphene oxide graphene by chemical oxidation method and then mixed at 95 ° C for one hour, reduced graphene graphene with attached platinum particles was formed To prepare a platinum / graphene composite. In order to manufacture a radio frequency identification sensor tag having a platinum / graphene composite, a passive microwave radio frequency identification tag composed of a micropatterned dipole tag antenna and an IC chip having a built-in microcontroller located at the center thereof is used, Except for an area of 3 x 6 mm 2 on the pattern, it is compression coated with plastic tape. A 50 μL ethanol solution containing 0.1 wt% of the platinum / graphene composite prepared by conducting the concentration of 1 mmol of platinum tetrachloride aqueous solution on the antenna pattern exposed portion is dropped and spin-coated at 1000 rpm for 45 seconds. A radio frequency identification sensor system is constructed using a radio frequency identification sensor tag having a platinum / graphene composite attached thereto. The radio frequency identification sensor system comprises a radio frequency identification antenna and a network analyzer connected thereto. The flow rate of the gas is controlled by a mass flow controller (MFC). Sensor response was measured at room temperature using a radio frequency identification sensor system, which detects hydrogen gas at concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm. After placing the radio frequency identification tag with the platinum / graphene composite in the vacuum chamber, the tag and the distance between the antenna and the sensor were set to 10 cm, and hydrogen gas at concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm Expose for 2 minutes to see if a sensing reaction occurs. The sensing reaction is indicated by back scattering between the tag of the sensor and the network analyzer to which the antenna is connected.
According to the improved Hummers method, graphene oxide is prepared and 0.25 wt% aqueous solution of graphene oxide is prepared using water as a solvent. To prepare the graphene oxide having the platinum particles attached thereto, 10 mmol of the aqueous solution of platinum tetrachloride was added to the prepared aqueous solution of the oxidized graphene, followed by stirring and mixing. 1 mmol of sodium borohydride was added to the mixture, and the mixture was stirred at a temperature of 50 ° C for one hour to obtain a graphene oxide grafted with platinum particles. When 0.1 wt% hydrazine solution was added to the prepared graphene oxide graphene by chemical oxidation method and then mixed at 95 ° C for one hour, reduced graphene graphene with attached platinum particles was formed To prepare a platinum / graphene composite. In order to manufacture a radio frequency identification sensor tag having a platinum / graphene composite, a passive microwave radio frequency identification tag composed of a micropatterned dipole tag antenna and an IC chip having a built-in microcontroller located at the center thereof is used, Except for an area of 3 x 6 mm 2 on the pattern, it is compression coated with plastic tape. The 50 μL ethanol solution containing 0.1 wt% of the platinum / graphene composite prepared by performing the concentration of the platinum tetrachloride aqueous solution at 10 mmol on the exposed portion of the antenna pattern was dropped and spin-coated at 1000 rpm for 45 seconds. A radio frequency identification sensor system is constructed using a radio frequency identification sensor tag having a platinum / graphene composite attached thereto. The radio frequency identification sensor system comprises a radio frequency identification antenna and a network analyzer connected thereto. The flow rate of the gas is controlled by a mass flow controller (MFC). Sensor response was measured at room temperature using a radio frequency identification sensor system, which detects hydrogen gas at concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm. After placing the radio frequency identification tag with the platinum / graphene composite in the vacuum chamber, the tag and the distance between the antenna and the sensor were set to 10 cm, and hydrogen gas at concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm Expose for 2 minutes to see if a sensing reaction occurs. The sensing reaction is indicated by back scattering between the tag of the sensor and the network analyzer to which the antenna is connected.
According to the improved Hummers method, graphene oxide is prepared and 0.25 wt% aqueous solution of graphene oxide is prepared using water as a solvent. To prepare the graphene oxide having the platinum particles attached thereto, 0.1 mmol of the aqueous solution of platinum tetrachloride was added to the prepared aqueous solution of the oxidized graphene, followed by stirring and mixing. 1 mmol of sodium borohydride was added to the mixture, and the mixture was stirred at a temperature of 25 ° C for 2 hours to obtain a graphene oxide graft having platinum particles. When 0.1 wt% hydrazine solution was added to the prepared graphene oxide graphene by chemical oxidation method and then mixed at 95 ° C for one hour, reduced graphene graphene with attached platinum particles was formed To prepare a platinum / graphene composite. In order to manufacture a radio frequency identification sensor tag having a platinum / graphene composite, a passive microwave radio frequency identification tag composed of a micropatterned dipole tag antenna and an IC chip having a built-in microcontroller located at the center thereof is used, Except for an area of 3 x 6 mm 2 on the pattern, it is compression coated with plastic tape. A 50 μL ethanol solution containing 0.1 wt% of the platinum / graphene composite prepared by conducting 0.1 mmol of platinum tetrachloride aqueous solution on the exposed portion of the antenna pattern is dropped and spin-coated at 1000 rpm for 45 seconds. A radio frequency identification sensor system is constructed using a radio frequency identification sensor tag having a platinum / graphene composite attached thereto. The radio frequency identification sensor system comprises a radio frequency identification antenna and a network analyzer connected thereto. The flow rate of the gas is controlled by a mass flow controller (MFC). Sensor response was measured at room temperature using a radio frequency identification sensor system, which detects hydrogen gas at concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm. After placing the radio frequency identification tag with the platinum / graphene composite in the vacuum chamber, the tag and the distance between the antenna and the sensor were set to 10 cm, and hydrogen gas at concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm Expose for 2 minutes to see if a sensing reaction occurs. The sensing reaction is indicated by back scattering between the tag of the sensor and the network analyzer to which the antenna is connected.
According to the improved Hummers method, graphene oxide is prepared and 0.25 wt% aqueous solution of graphene oxide is prepared using water as a solvent. To prepare the graphene oxide having the platinum particles attached thereto, 1 mmol of the aqueous solution of platinum tetrachloride was added to the prepared aqueous solution of the graphene oxide, followed by stirring and mixing. 1 mmol of sodium borohydride was added to the mixture, and the mixture was stirred at a temperature of 25 ° C for 2 hours to obtain a graphene oxide graft having platinum particles. When 0.1 wt% hydrazine solution was added to the prepared graphene oxide graphene by chemical oxidation method and then mixed at 95 ° C for one hour, reduced graphene graphene with attached platinum particles was formed To prepare a platinum / graphene composite. In order to manufacture a radio frequency identification sensor tag having a platinum / graphene composite, a passive microwave radio frequency identification tag composed of a micropatterned dipole tag antenna and an IC chip having a built-in microcontroller located at the center thereof is used, Except for an area of 3 x 6 mm 2 on the pattern, it is compression coated with plastic tape. The 50 μL ethanol solution containing 0.1 wt% of the platinum / graphene composite prepared by conducting the concentration of the platinum tetrachloride aqueous solution at 1 mmol of the antenna pattern exposed portion is dropped and spin-coated at 1000 rpm for 45 seconds. A radio frequency identification sensor system is constructed using a radio frequency identification sensor tag having a platinum / graphene composite attached thereto. The radio frequency identification sensor system comprises a radio frequency identification antenna and a network analyzer connected thereto. The flow rate of the gas is controlled by a mass flow controller (MFC). Sensor response was measured at room temperature using a radio frequency identification sensor system, which detects hydrogen gas at concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm. After placing the radio frequency identification tag with the platinum / graphene composite in the vacuum chamber, the tag and the distance between the antenna and the sensor were set to 10 cm, and hydrogen gas at concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm Expose for 2 minutes to see if a sensing reaction occurs. The sensing reaction is indicated by back scattering between the tag of the sensor and the network analyzer to which the antenna is connected.
According to the improved Hummers method, graphene oxide is prepared and 0.25 wt% aqueous solution of graphene oxide is prepared using water as a solvent. To prepare the graphene oxide having the platinum particles attached thereto, 10 mmol of the aqueous solution of platinum tetrachloride was added to the prepared aqueous solution of the oxidized graphene, followed by stirring and mixing. 1 mmol of sodium borohydride was added to the mixture, and the mixture was stirred at a temperature of 25 ° C for 2 hours to obtain a graphene oxide graft having platinum particles. When 0.1 wt% hydrazine solution was added to the prepared graphene oxide graphene by chemical oxidation method and then mixed at 95 ° C for one hour, reduced graphene graphene with attached platinum particles was formed To prepare a platinum / graphene composite. In order to manufacture a radio frequency identification sensor tag having a platinum / graphene composite, a passive microwave radio frequency identification tag composed of a micropatterned dipole tag antenna and an IC chip having a built-in microcontroller located at the center thereof is used, Except for an area of 3 x 6 mm 2 on the pattern, it is compression coated with plastic tape. The 50 μL ethanol solution containing 0.1 wt% of the platinum / graphene composite prepared by performing the concentration of the platinum tetrachloride aqueous solution at 10 mmol on the exposed portion of the antenna pattern was dropped and spin-coated at 1000 rpm for 45 seconds. A radio frequency identification sensor system is constructed using a radio frequency identification sensor tag having a platinum / graphene composite attached thereto. The radio frequency identification sensor system comprises a radio frequency identification antenna and a network analyzer connected thereto. The flow rate of the gas is controlled by a mass flow controller (MFC). Sensor response was measured at room temperature using a radio frequency identification sensor system, which detects hydrogen gas at concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm. After placing the radio frequency identification tag with the platinum / graphene composite in the vacuum chamber, the tag and the distance between the antenna and the sensor were set to 10 cm, and hydrogen gas at concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm Expose for 2 minutes to see if a sensing reaction occurs. The sensing reaction is indicated by back scattering between the tag of the sensor and the network analyzer to which the antenna is connected.
According to the improved Hummers method, graphene oxide is prepared and 0.25 wt% aqueous solution of graphene oxide is prepared using water as a solvent. To prepare the graphene oxide having the platinum particles attached thereto, 0.1 mmol of the aqueous solution of platinum tetrachloride was added to the prepared aqueous solution of the oxidized graphene, followed by stirring and mixing. 1 mmol of sodium borohydride was added to the resulting mixture, and the mixture was stirred at 25 ° C for one hour to obtain a grafted oxide graphene. When 0.1 wt% hydrazine solution was added to the prepared graphene oxide graphene by chemical oxidation method and then mixed at 95 ° C for one hour, reduced graphene graphene with attached platinum particles was formed To prepare a platinum / graphene composite. In order to manufacture a radio frequency identification sensor tag having a platinum / graphene composite, a passive microwave radio frequency identification tag composed of a micropatterned dipole tag antenna and an IC chip having a built-in microcontroller located at the center thereof is used, Except for an area of 3 x 6 mm 2 on the pattern, it is compression coated with plastic tape. A 50 μL ethanol solution containing 1 wt% of platinum / graphene composite prepared by conducting 0.1 mmol of platinum tetrachloride aqueous solution was dropped on the exposed portion of the antenna pattern, followed by spin coating at 1000 rpm for 45 seconds. A radio frequency identification sensor system is constructed using a radio frequency identification sensor tag having a platinum / graphene composite attached thereto. The radio frequency identification sensor system comprises a radio frequency identification antenna and a network analyzer connected thereto. The flow rate of the gas is controlled by a mass flow controller (MFC). Sensor response was measured at room temperature using a radio frequency identification sensor system, which detects hydrogen gas at concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm. After placing the radio frequency identification tag with the platinum / graphene composite in the vacuum chamber, the tag and the distance between the antenna and the sensor were set to 10 cm, and hydrogen gas at concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm Expose for 2 minutes to see if a sensing reaction occurs. The sensing reaction is indicated by back scattering between the tag of the sensor and the network analyzer to which the antenna is connected.
According to the improved Hummers method, graphene oxide is prepared and 0.25 wt% aqueous solution of graphene oxide is prepared using water as a solvent. To prepare the graphene oxide having the platinum particles attached thereto, 1 mmol of the aqueous solution of platinum tetrachloride was added to the prepared aqueous solution of the graphene oxide, followed by stirring and mixing. 1 mmol of sodium borohydride was added to the resulting mixture, and the mixture was stirred at 25 ° C for one hour to obtain a grafted oxide graphene. When 0.1 wt% hydrazine solution was added to the prepared graphene oxide graphene by chemical oxidation method and then mixed at 95 ° C for one hour, reduced graphene graphene with attached platinum particles was formed To prepare a platinum / graphene composite. In order to manufacture a radio frequency identification sensor tag having a platinum / graphene composite, a passive microwave radio frequency identification tag composed of a micropatterned dipole tag antenna and an IC chip having a built-in microcontroller located at the center thereof is used, Except for an area of 3 x 6 mm 2 on the pattern, it is compression coated with plastic tape. A 50 μL ethanol solution containing 1 wt% of the platinum / graphene composite prepared by conducting the concentration of the platinum tetrachloride aqueous solution at the exposed portion of the antenna pattern is dropped and spin-coated at 1000 rpm for 45 seconds. A radio frequency identification sensor system is constructed using a radio frequency identification sensor tag having a platinum / graphene composite attached thereto. The radio frequency identification sensor system comprises a radio frequency identification antenna and a network analyzer connected thereto. The flow rate of the gas is controlled by a mass flow controller (MFC). Sensor response was measured at room temperature using a radio frequency identification sensor system, which detects hydrogen gas at concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm. After placing the radio frequency identification tag with the platinum / graphene composite in the vacuum chamber, the tag and the distance between the antenna and the sensor were set to 10 cm, and hydrogen gas at concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm Expose for 2 minutes to see if a sensing reaction occurs. The sensing reaction is indicated by back scattering between the tag of the sensor and the network analyzer to which the antenna is connected.
According to the improved Hummers method, graphene oxide is prepared and 0.25 wt% aqueous solution of graphene oxide is prepared using water as a solvent. To prepare the graphene oxide having the platinum particles attached thereto, 10 mmol of the aqueous solution of platinum tetrachloride was added to the prepared aqueous solution of the oxidized graphene, followed by stirring and mixing. 1 mmol of sodium borohydride was added to the resulting mixture, and the mixture was stirred at 25 ° C for one hour to obtain a grafted oxide graphene. When 0.1 wt% hydrazine solution was added to the prepared graphene oxide graphene by chemical oxidation method and then mixed at 95 ° C for one hour, reduced graphene graphene with attached platinum particles was formed To prepare a platinum / graphene composite. In order to manufacture a radio frequency identification sensor tag having a platinum / graphene composite, a passive microwave radio frequency identification tag composed of a micropatterned dipole tag antenna and an IC chip having a built-in microcontroller located at the center thereof is used, Except for an area of 3 x 6 mm 2 on the pattern, it is compression coated with plastic tape. A 50 μL ethanol solution containing 1 wt% of the platinum / graphene composite prepared by conducting the concentration of the platinum tetrachloride aqueous solution at the exposed portion of the antenna pattern is dropped and spin-coated at 1000 rpm for 45 seconds. A radio frequency identification sensor system is constructed using a radio frequency identification sensor tag having a platinum / graphene composite attached thereto. The radio frequency identification sensor system comprises a radio frequency identification antenna and a network analyzer connected thereto. The flow rate of the gas is controlled by a mass flow controller (MFC). Sensor response was measured at room temperature using a radio frequency identification sensor system, which detects hydrogen gas at concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm. After placing the radio frequency identification tag with the platinum / graphene composite in the vacuum chamber, the tag and the distance between the antenna and the sensor were set to 10 cm, and hydrogen gas at concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm Expose for 2 minutes to see if a sensing reaction occurs. The sensing reaction is indicated by back scattering between the tag of the sensor and the network analyzer to which the antenna is connected.
According to the improved Hummers method, graphene oxide is prepared and 0.25 wt% aqueous solution of graphene oxide is prepared using water as a solvent. To prepare the graphene oxide having the platinum particles attached thereto, 0.1 mmol of the aqueous solution of platinum tetrachloride was added to the prepared aqueous solution of the oxidized graphene, followed by stirring and mixing. 1 mmol of sodium borohydride was added to the resulting mixture, and the mixture was stirred at 25 ° C for one hour to obtain a grafted oxide graphene. When 0.1 wt% hydrazine solution was added to the prepared graphene oxide graphene by chemical oxidation method and then mixed at 95 ° C for one hour, reduced graphene graphene with attached platinum particles was formed To prepare a platinum / graphene composite. In order to manufacture a radio frequency identification sensor tag having a platinum / graphene composite, a passive microwave radio frequency identification tag composed of a micropatterned dipole tag antenna and an IC chip having a built-in microcontroller located at the center thereof is used, Except for an area of 3 x 6 mm 2 on the pattern, it is compression coated with plastic tape. A 50 μL ethanol solution containing 0.1 wt% of the platinum / graphene composite prepared by conducting 0.1 mmol of platinum tetrachloride aqueous solution on the exposed portion of the antenna pattern is dropped and spin-coated at 1000 rpm for 45 seconds. A radio frequency identification sensor system is constructed using a radio frequency identification sensor tag having a platinum / graphene composite attached thereto. The radio frequency identification sensor system comprises a radio frequency identification antenna and a network analyzer connected thereto. The flow rate of the gas is controlled by a mass flow controller (MFC). Sensor response was measured at room temperature using a radio frequency identification sensor system, which detects hydrogen gas at concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm. After placing the radio frequency identification tag with the platinum / graphene composite in the vacuum chamber, the tags and the distance between the antenna and the sensor were set to 50 cm, and hydrogen gas at concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm Expose for 2 minutes to see if a sensing reaction occurs. The sensing reaction is indicated by back scattering between the tag of the sensor and the network analyzer to which the antenna is connected.
According to the improved Hummers method, graphene oxide is prepared and 0.25 wt% aqueous solution of graphene oxide is prepared using water as a solvent. To prepare the graphene oxide having the platinum particles attached thereto, 1 mmol of the aqueous solution of platinum tetrachloride was added to the prepared aqueous solution of the graphene oxide, followed by stirring and mixing. 1 mmol of sodium borohydride was added to the resulting mixture, and the mixture was stirred at 25 ° C for one hour to obtain a grafted oxide graphene. When 0.1 wt% hydrazine solution was added to the prepared graphene oxide graphene by chemical oxidation method and then mixed at 95 ° C for one hour, reduced graphene graphene with attached platinum particles was formed To prepare a platinum / graphene composite. In order to manufacture a radio frequency identification sensor tag having a platinum / graphene composite, a passive microwave radio frequency identification tag composed of a micropatterned dipole tag antenna and an IC chip having a built-in microcontroller located at the center thereof is used, Except for an area of 3 x 6 mm 2 on the pattern, it is compression coated with plastic tape. A 50 μL ethanol solution containing 0.1 wt% of the platinum / graphene composite prepared by conducting the concentration of 1 mmol of platinum tetrachloride aqueous solution on the antenna pattern exposed portion is dropped and spin-coated at 1000 rpm for 45 seconds. A radio frequency identification sensor system is constructed using a radio frequency identification sensor tag having a platinum / graphene composite attached thereto. The radio frequency identification sensor system comprises a radio frequency identification antenna and a network analyzer connected thereto. The flow rate of the gas is controlled by a mass flow controller (MFC). Sensor response was measured at room temperature using a radio frequency identification sensor system, which detects hydrogen gas at concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm. After placing the radio frequency identification tag with the platinum / graphene composite in the vacuum chamber, the tags and the distance between the antenna and the sensor were set to 50 cm, and hydrogen gas at concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm Expose for 2 minutes to see if a sensing reaction occurs. The sensing reaction is indicated by back scattering between the tag of the sensor and the network analyzer to which the antenna is connected.
According to the improved Hummers method, graphene oxide is prepared and 0.25 wt% aqueous solution of graphene oxide is prepared using water as a solvent. To prepare the graphene oxide having the platinum particles attached thereto, 10 mmol of the aqueous solution of platinum tetrachloride was added to the prepared aqueous solution of the oxidized graphene, followed by stirring and mixing. 1 mmol of sodium borohydride was added to the resulting mixture, and the mixture was stirred at 25 ° C for one hour to obtain a grafted oxide graphene. When 0.1 wt% hydrazine solution was added to the prepared graphene oxide graphene by chemical oxidation method and then mixed at 95 ° C for one hour, reduced graphene graphene with attached platinum particles was formed To prepare a platinum / graphene composite. In order to manufacture a radio frequency identification sensor tag having a platinum / graphene composite, a passive microwave radio frequency identification tag composed of a micropatterned dipole tag antenna and an IC chip having a built-in microcontroller located at the center thereof is used, Except for an area of 3 x 6 mm 2 on the pattern, it is compression coated with plastic tape. The 50 μL ethanol solution containing 0.1 wt% of the platinum / graphene composite prepared by performing the concentration of the platinum tetrachloride aqueous solution at 10 mmol on the exposed portion of the antenna pattern was dropped and spin-coated at 1000 rpm for 45 seconds. A radio frequency identification sensor system is constructed using a radio frequency identification sensor tag having a platinum / graphene composite attached thereto. The radio frequency identification sensor system comprises a radio frequency identification antenna and a network analyzer connected thereto. The flow rate of the gas is controlled by a mass flow controller (MFC). Sensor response was measured at room temperature using a radio frequency identification sensor system, which detects hydrogen gas at concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm. After placing the radio frequency identification tag with the platinum / graphene composite in the vacuum chamber, the tags and the distance between the antenna and the sensor were set to 50 cm, and hydrogen gas at concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm Expose for 2 minutes to see if a sensing reaction occurs. The sensing reaction is indicated by back scattering between the tag of the sensor and the network analyzer to which the antenna is connected.
According to the improved Hummers method, graphene oxide is prepared and 0.25 wt% aqueous solution of graphene oxide is prepared using water as a solvent. To prepare the graphene oxide having the platinum particles attached thereto, 0.1 mmol of the aqueous solution of platinum tetrachloride was added to the prepared aqueous solution of the oxidized graphene, followed by stirring and mixing. 1 mmol of sodium borohydride was added to the resulting mixture, and the mixture was stirred at 25 ° C for one hour to obtain a grafted oxide graphene. When 0.1 wt% hydrazine solution was added to the prepared graphene oxide graphene by chemical oxidation method and then mixed at 95 ° C for one hour, reduced graphene graphene with attached platinum particles was formed To prepare a platinum / graphene composite. In order to manufacture a radio frequency identification sensor tag having a platinum / graphene composite, a passive microwave radio frequency identification tag composed of a micropatterned dipole tag antenna and an IC chip having a built-in microcontroller located at the center thereof is used, Except for an area of 3 x 6 mm 2 on the pattern, it is compression coated with plastic tape. A 50 μL ethanol solution containing 0.1 wt% of the platinum / graphene composite prepared by conducting 0.1 mmol of platinum tetrachloride aqueous solution on the exposed portion of the antenna pattern is dropped and spin-coated at 1000 rpm for 45 seconds. A radio frequency identification sensor system is constructed using a radio frequency identification sensor tag having a platinum / graphene composite attached thereto. The radio frequency identification sensor system comprises a radio frequency identification antenna and a network analyzer connected thereto. The flow rate of the gas is controlled by a mass flow controller (MFC). Sensor response was measured at room temperature using a radio frequency identification sensor system, which detects hydrogen gas at concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm. After placing the radio frequency identification tag with the platinum / graphene composite in the vacuum chamber, the tag and distance between the antenna and the sensor were set to 1 m, and hydrogen gas at concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm Expose for 2 minutes to see if a sensing reaction occurs. The sensing reaction is indicated by back scattering between the tag of the sensor and the network analyzer to which the antenna is connected.
According to the improved Hummers method, graphene oxide is prepared and 0.25 wt% aqueous solution of graphene oxide is prepared using water as a solvent. To prepare the graphene oxide having the platinum particles attached thereto, 1 mmol of the aqueous solution of platinum tetrachloride was added to the prepared aqueous solution of the graphene oxide, followed by stirring and mixing. 1 mmol of sodium borohydride was added to the resulting mixture, and the mixture was stirred at 25 ° C for one hour to obtain a grafted oxide graphene. When 0.1 wt% hydrazine solution was added to the prepared graphene oxide graphene by chemical oxidation method and then mixed at 95 ° C for one hour, reduced graphene graphene with attached platinum particles was formed To prepare a platinum / graphene composite. In order to manufacture a radio frequency identification sensor tag having a platinum / graphene composite, a passive microwave radio frequency identification tag composed of a micropatterned dipole tag antenna and an IC chip having a built-in microcontroller located at the center thereof is used, Except for an area of 3 x 6 mm 2 on the pattern, it is compression coated with plastic tape. The 50 μL ethanol solution containing 0.1 wt% of the platinum / graphene composite prepared by conducting the concentration of the platinum tetrachloride aqueous solution at 1 mmol of the antenna pattern exposed portion is dropped and spin-coated at 1000 rpm for 45 seconds. A radio frequency identification sensor system is constructed using a radio frequency identification sensor tag having a platinum / graphene composite attached thereto. The radio frequency identification sensor system comprises a radio frequency identification antenna and a network analyzer connected thereto. The flow rate of the gas is controlled by a mass flow controller (MFC). Sensor response was measured at room temperature using a radio frequency identification sensor system, which detects hydrogen gas at concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm. After placing the radio frequency identification tag with the platinum / graphene composite in the vacuum chamber, the tag and distance between the antenna and the sensor were set to 1 m, and hydrogen gas at concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm Expose for 2 minutes to see if a sensing reaction occurs. The sensing reaction is indicated by back scattering between the tag of the sensor and the network analyzer to which the antenna is connected.
According to the improved Hummers method, graphene oxide is prepared and 0.25 wt% aqueous solution of graphene oxide is prepared using water as a solvent. To prepare the graphene oxide having the platinum particles attached thereto, 10 mmol of the aqueous solution of platinum tetrachloride was added to the prepared aqueous solution of the oxidized graphene, followed by stirring and mixing. 1 mmol of sodium borohydride was added to the resulting mixture, and the mixture was stirred at 25 ° C for one hour to obtain a grafted oxide graphene. When 0.1 wt% hydrazine solution was added to the prepared graphene oxide graphene by chemical oxidation method and then mixed at 95 ° C for one hour, reduced graphene graphene with attached platinum particles was formed To prepare a platinum / graphene composite. In order to manufacture a radio frequency identification sensor tag having a platinum / graphene composite, a passive microwave radio frequency identification tag composed of a micropatterned dipole tag antenna and an IC chip having a built-in microcontroller located at the center thereof is used, Except for an area of 3 x 6 mm 2 on the pattern, it is compression coated with plastic tape. The 50 μL ethanol solution containing 0.1 wt% of the platinum / graphene composite prepared by performing the concentration of the platinum tetrachloride aqueous solution at 10 mmol on the exposed portion of the antenna pattern was dropped and spin-coated at 1000 rpm for 45 seconds. A radio frequency identification sensor system is constructed using a radio frequency identification sensor tag having a platinum / graphene composite attached thereto. The radio frequency identification sensor system comprises a radio frequency identification antenna and a network analyzer connected thereto. The flow rate of the gas is controlled by a mass flow controller (MFC). Sensor response was measured at room temperature using a radio frequency identification sensor system, which detects hydrogen gas at concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm. After placing the radio frequency identification tag with the platinum / graphene composite in the vacuum chamber, the tag and distance between the antenna and the sensor were set to 1 m, and hydrogen gas at concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm Expose for 2 minutes to see if a sensing reaction occurs. The sensing reaction is indicated by back scattering between the tag of the sensor and the network analyzer to which the antenna is connected.
According to the improved Hummers method, graphene oxide is prepared and 0.25 wt% aqueous solution of graphene oxide is prepared using water as a solvent. To prepare the graphene oxide having the platinum particles attached thereto, 0.1 mmol of the aqueous solution of platinum tetrachloride was added to the prepared aqueous solution of the oxidized graphene, followed by stirring and mixing. 1 mmol of sodium borohydride was added to the resulting mixture, and the mixture was stirred at 25 ° C for one hour to obtain a grafted oxide graphene. When 0.1 wt% hydrazine solution was added to the prepared graphene oxide graphene by chemical oxidation method and then mixed at 95 ° C for one hour, reduced graphene graphene with attached platinum particles was formed To prepare a platinum / graphene composite. In order to manufacture a radio frequency identification sensor tag having a platinum / graphene composite, a passive microwave radio frequency identification tag composed of a micropatterned dipole tag antenna and an IC chip having a built-in microcontroller located at the center thereof is used, Except for an area of 3 x 6 mm 2 on the pattern, it is compression coated with plastic tape. A 50 μL ethanol solution containing 0.1 wt% of the platinum / graphene composite prepared by conducting 0.1 mmol of platinum tetrachloride aqueous solution on the exposed portion of the antenna pattern is dropped and spin-coated at 1000 rpm for 45 seconds. A radio frequency identification sensor system is constructed using a radio frequency identification sensor tag having a platinum / graphene composite attached thereto. The radio frequency identification sensor system comprises a radio frequency identification antenna and a network analyzer connected thereto. The flow rate of the gas is controlled by a mass flow controller (MFC). Sensor response was measured at room temperature using a radio frequency identification sensor system, which detects hydrogen gas at concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm. The radio frequency identification tag with the platinum / graphene composite was placed in a vacuum chamber, and the hydrogen and gas concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm Expose for 2 minutes to see if a sensing reaction occurs. The sensing reaction is indicated by back scattering between the tag of the sensor and the network analyzer to which the antenna is connected.
According to the improved Hummers method, graphene oxide is prepared and 0.25 wt% aqueous solution of graphene oxide is prepared using water as a solvent. To prepare the graphene oxide having the platinum particles attached thereto, 1 mmol of the aqueous solution of platinum tetrachloride was added to the prepared aqueous solution of the graphene oxide, followed by stirring and mixing. 1 mmol of sodium borohydride was added to the resulting mixture, and the mixture was stirred at 25 ° C for one hour to obtain a grafted oxide graphene. When 0.1 wt% hydrazine solution was added to the prepared graphene oxide graphene by chemical oxidation method and then mixed at 95 ° C for one hour, reduced graphene graphene with attached platinum particles was formed To prepare a platinum / graphene composite. In order to manufacture a radio frequency identification sensor tag having a platinum / graphene composite, a passive microwave radio frequency identification tag composed of a micropatterned dipole tag antenna and an IC chip having a built-in microcontroller located at the center thereof is used, Except for an area of 3 x 6 mm 2 on the pattern, it is compression coated with plastic tape. The 50 μL ethanol solution containing 0.1 wt% of the platinum / graphene composite prepared by conducting the concentration of the platinum tetrachloride aqueous solution at 1 mmol of the antenna pattern exposed portion is dropped and spin-coated at 1000 rpm for 45 seconds. A radio frequency identification sensor system is constructed using a radio frequency identification sensor tag having a platinum / graphene composite attached thereto. The radio frequency identification sensor system comprises a radio frequency identification antenna and a network analyzer connected thereto. The flow rate of the gas is controlled by a mass flow controller (MFC). Sensor response was measured at room temperature using a radio frequency identification sensor system, which detects hydrogen gas at concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm. The radio frequency identification tag with the platinum / graphene composite was placed in a vacuum chamber, and the hydrogen and gas concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm Expose for 2 minutes to see if a sensing reaction occurs. The sensing reaction is indicated by back scattering between the tag of the sensor and the network analyzer to which the antenna is connected.
According to the improved Hummers method, graphene oxide is prepared and 0.25 wt% aqueous solution of graphene oxide is prepared using water as a solvent. To prepare the graphene oxide having the platinum particles attached thereto, 10 mmol of the aqueous solution of platinum tetrachloride was added to the prepared aqueous solution of the oxidized graphene, followed by stirring and mixing. 1 mmol of sodium borohydride was added to the resulting mixture, and the mixture was stirred at 25 ° C for one hour to obtain a grafted oxide graphene. When 0.1 wt% hydrazine solution was added to the prepared graphene oxide graphene by chemical oxidation method and then mixed at 95 ° C for one hour, reduced graphene graphene with attached platinum particles was formed To prepare a platinum / graphene composite. In order to manufacture a radio frequency identification sensor tag having a platinum / graphene composite, a passive microwave radio frequency identification tag composed of a micropatterned dipole tag antenna and an IC chip having a built-in microcontroller located at the center thereof is used, Except for an area of 3 x 6 mm 2 on the pattern, it is compression coated with plastic tape. The 50 μL ethanol solution containing 0.1 wt% of the platinum / graphene composite prepared by performing the concentration of the platinum tetrachloride aqueous solution at 10 mmol on the exposed portion of the antenna pattern was dropped and spin-coated at 1000 rpm for 45 seconds. A radio frequency identification sensor system is constructed using a radio frequency identification sensor tag having a platinum / graphene composite attached thereto. The radio frequency identification sensor system comprises a radio frequency identification antenna and a network analyzer connected thereto. The flow rate of the gas is controlled by a mass flow controller (MFC). Sensor response was measured at room temperature using a radio frequency identification sensor system, which detects hydrogen gas at concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm. The radio frequency identification tag with the platinum / graphene composite was placed in a vacuum chamber, and the hydrogen and gas concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm Expose for 2 minutes to see if a sensing reaction occurs. The sensing reaction is indicated by back scattering between the tag of the sensor and the network analyzer to which the antenna is connected.
According to the improved Hummers method, graphene oxide is prepared and 0.25 wt% aqueous solution of graphene oxide is prepared using water as a solvent. To prepare the graphene oxide having the platinum particles attached thereto, 0.1 mmol of the aqueous solution of platinum tetrachloride was added to the prepared aqueous solution of the oxidized graphene, followed by stirring and mixing. 1 mmol of sodium borohydride was added to the resulting mixture, and the mixture was stirred at 25 ° C for one hour to obtain a grafted oxide graphene. When 0.1 wt% hydrazine solution was added to the prepared graphene oxide graphene by chemical oxidation method and then mixed at 95 ° C for one hour, reduced graphene graphene with attached platinum particles was formed To prepare a platinum / graphene composite. In order to manufacture a radio frequency identification sensor tag having a platinum / graphene composite, a passive microwave radio frequency identification tag composed of a micropatterned dipole tag antenna and an IC chip having a built-in microcontroller located at the center thereof is used, Except for an area of 3 x 6 mm 2 on the pattern, it is compression coated with plastic tape. A 50 μL ethanol solution containing 0.1 wt% of the platinum / graphene composite prepared by conducting 0.1 mmol of platinum tetrachloride aqueous solution on the exposed portion of the antenna pattern is dropped and spin-coated at 1000 rpm for 45 seconds. A radio frequency identification sensor system is constructed using a radio frequency identification sensor tag having a platinum / graphene composite attached thereto. The radio frequency identification sensor system comprises a radio frequency identification antenna and a network analyzer connected thereto. The flow rate of the gas is controlled by a mass flow controller (MFC). Sensor response was measured at room temperature using a radio frequency identification sensor system, which detects hydrogen gas at concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm. After placing the radio frequency identification tag with the platinum / graphene composite in the vacuum chamber, the tag and the distance between the antenna and the sensor were set to 10 cm, and hydrogen gas at concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm Expose for 30 minutes to see if a sensing reaction occurs. The sensing reaction is indicated by back scattering between the tag of the sensor and the network analyzer to which the antenna is connected.
According to the improved Hummers method, graphene oxide is prepared and 0.25 wt% aqueous solution of graphene oxide is prepared using water as a solvent. To prepare the graphene oxide having the platinum particles attached thereto, 1 mmol of the aqueous solution of platinum tetrachloride was added to the prepared aqueous solution of the graphene oxide, followed by stirring and mixing. 1 mmol of sodium borohydride was added to the resulting mixture, and the mixture was stirred at 25 ° C for one hour to obtain a grafted oxide graphene. When 0.1 wt% hydrazine solution was added to the prepared graphene oxide graphene by chemical oxidation method and then mixed at 95 ° C for one hour, reduced graphene graphene with attached platinum particles was formed To prepare a platinum / graphene composite. In order to manufacture a radio frequency identification sensor tag having a platinum / graphene composite, a passive microwave radio frequency identification tag composed of a micropatterned dipole tag antenna and an IC chip having a built-in microcontroller located at the center thereof is used, Except for an area of 3 x 6 mm 2 on the pattern, it is compression coated with plastic tape. The 50 μL ethanol solution containing 0.1 wt% of the platinum / graphene composite prepared by conducting the concentration of the platinum tetrachloride aqueous solution at 1 mmol of the antenna pattern exposed portion is dropped and spin-coated at 1000 rpm for 45 seconds. A radio frequency identification sensor system is constructed using a radio frequency identification sensor tag having a platinum / graphene composite attached thereto. The radio frequency identification sensor system comprises a radio frequency identification antenna and a network analyzer connected thereto. The flow rate of the gas is controlled by a mass flow controller (MFC). Sensor response was measured at room temperature using a radio frequency identification sensor system, which detects hydrogen gas at concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm. After placing the radio frequency identification tag with the platinum / graphene composite in the vacuum chamber, the tag and distance between the antenna and the sensor were set to 1 m, and hydrogen gas at concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm Expose for 30 minutes to see if a sensing reaction occurs. The sensing reaction is indicated by back scattering between the tag of the sensor and the network analyzer to which the antenna is connected.
According to the improved Hummers method, graphene oxide is prepared and 0.25 wt% aqueous solution of graphene oxide is prepared using water as a solvent. To prepare the graphene oxide having the platinum particles attached thereto, 10 mmol of the aqueous solution of platinum tetrachloride was added to the prepared aqueous solution of the oxidized graphene, followed by stirring and mixing. 1 mmol of sodium borohydride was added to the resulting mixture, and the mixture was stirred at 25 ° C for one hour to obtain a grafted oxide graphene. When 0.1 wt% hydrazine solution was added to the prepared graphene oxide graphene by chemical oxidation method and then mixed at 95 ° C for one hour, reduced graphene graphene with attached platinum particles was formed To prepare a platinum / graphene composite. In order to manufacture a radio frequency identification sensor tag having a platinum / graphene composite, a passive microwave radio frequency identification tag composed of a micropatterned dipole tag antenna and an IC chip having a built-in microcontroller located at the center thereof is used, Except for an area of 3 x 6 mm 2 on the pattern, it is compression coated with plastic tape. The 50 μL ethanol solution containing 0.1 wt% of the platinum / graphene composite prepared by performing the concentration of the platinum tetrachloride aqueous solution at 10 mmol on the exposed portion of the antenna pattern was dropped and spin-coated at 1000 rpm for 45 seconds. A radio frequency identification sensor system is constructed using a radio frequency identification sensor tag having a platinum / graphene composite attached thereto. The radio frequency identification sensor system comprises a radio frequency identification antenna and a network analyzer connected thereto. The flow rate of the gas is controlled by a mass flow controller (MFC). Sensor response was measured at room temperature using a radio frequency identification sensor system, which detects hydrogen gas at concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm. After placing the radio frequency identification tag with the platinum / graphene composite in the vacuum chamber, the tag and distance between the antenna and the sensor were set to 1 m, and hydrogen gas at concentrations of 1 ppm, 10 ppm, 20 ppm, and 50 ppm Expose for 30 minutes to see if a sensing reaction occurs. The sensing reaction is indicated by back scattering between the tag of the sensor and the network analyzer to which the antenna is connected.
none
Claims (17)
Preparing a platinum / graphene composite finally by using the chemical oxidation method of the graphene oxide having the platinum particles attached thereto; And
Fabricating a radio frequency identification sensor tag by uniformly arranging the platinum / graphene complex on a radio frequency identification tag using spin coating; And
And establishing a radio frequency identification sensor system for sensing hydrogen gas using the radio frequency identification sensor tag and providing a sensing means using the radio frequency identification sensor system. Method for manufacturing hydrogen gas sensor using tag
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