CN113686928A - GO/In2O3Composite nano material and preparation and application thereof - Google Patents
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- 239000002086 nanomaterial Substances 0.000 title claims abstract description 44
- 238000002360 preparation method Methods 0.000 title claims description 22
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 84
- PJXISJQVUVHSOJ-UHFFFAOYSA-N indium(iii) oxide Chemical compound [O-2].[O-2].[O-2].[In+3].[In+3] PJXISJQVUVHSOJ-UHFFFAOYSA-N 0.000 claims abstract description 35
- 238000001514 detection method Methods 0.000 claims abstract description 18
- 229910003437 indium oxide Inorganic materials 0.000 claims abstract description 10
- 239000002131 composite material Substances 0.000 claims description 20
- 238000003756 stirring Methods 0.000 claims description 20
- 239000002243 precursor Substances 0.000 claims description 18
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 15
- 238000011068 loading method Methods 0.000 claims description 12
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 11
- 239000000243 solution Substances 0.000 claims description 11
- 239000006185 dispersion Substances 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000001354 calcination Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 5
- 239000013078 crystal Substances 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 229910021389 graphene Inorganic materials 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 239000011259 mixed solution Substances 0.000 claims description 3
- 229910052738 indium Inorganic materials 0.000 claims description 2
- 239000003054 catalyst Substances 0.000 claims 1
- 230000035945 sensitivity Effects 0.000 abstract description 17
- 230000004044 response Effects 0.000 abstract description 10
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 238000004729 solvothermal method Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 30
- 239000008367 deionised water Substances 0.000 description 8
- 229910021641 deionized water Inorganic materials 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 7
- 239000005457 ice water Substances 0.000 description 6
- 239000000919 ceramic Substances 0.000 description 4
- 239000012286 potassium permanganate Substances 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 3
- 230000032683 aging Effects 0.000 description 3
- 238000003912 environmental pollution Methods 0.000 description 3
- 230000036541 health Effects 0.000 description 3
- 229910044991 metal oxide Inorganic materials 0.000 description 3
- 150000004706 metal oxides Chemical class 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
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- 238000004108 freeze drying Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000002114 nanocomposite Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 231100000331 toxic Toxicity 0.000 description 2
- 230000002588 toxic effect Effects 0.000 description 2
- 206010028813 Nausea Diseases 0.000 description 1
- 206010033799 Paralysis Diseases 0.000 description 1
- 206010047700 Vomiting Diseases 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 210000003169 central nervous system Anatomy 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 230000005802 health problem Effects 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 230000007794 irritation Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000013335 mesoporous material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000008693 nausea Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000011540 sensing material Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Inorganic materials [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 208000024891 symptom Diseases 0.000 description 1
- 239000012855 volatile organic compound Substances 0.000 description 1
- 230000008673 vomiting Effects 0.000 description 1
- 229910009112 xH2O Inorganic materials 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/12—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid, for detecting components in the fluid
- G01N27/125—Composition of the body, e.g. the composition of its sensitive layer
- G01N27/127—Composition of the body, e.g. the composition of its sensitive layer comprising nanoparticles
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Abstract
In loaded with GO prepared by solvothermal method2O3The nano material has good sensitivity to the detection of the ethanol gas, reduces the working temperature of the indium oxide to the detection of the ethanol gas, meets the requirement of energy conservation to a certain extent, and prolongs the service life of a sensing device. The manufactured sensing device has smaller volume and lower cost, and In is loaded on the basis of GO provided by the invention2O3The gas sensor made of nano material has good gas-sensitive performance for detecting ethanol, 0.5 percent of GO/In2O3The kit has the highest response value to ethanol at 220 ℃, has good selectivity, reproducibility, stability and ultralow detection limit, is quick in response, and has important significance for detecting ethanol on site in real time.
Description
Technical Field
The invention relates to In loaded by Graphene Oxide (GO)2O3A nano material, a preparation method and application thereof in the field of ethanol detection sensors belong to the technical field of gas sensors.
Background
The continuous progress of social industrialization and urbanization is promoted, and the discharge amount of pollutants such as industrial waste gas and automobile exhaust is increasing day by day. The emission of a large amount of toxic, harmful, flammable and explosive gases not only causes environmental pollution and damage to the ecological system, but also seriously threatens the health of people. The gas sensor is an important part of a chemical sensor, and can be used for detecting toxic and harmful gases in the air in real time as a low-cost and miniaturized sensing element. Gas sensors are currently widely used in various fields including public safety, industrial processes, home safety, underground mining, and vehicle environmental pollution and air quality monitoring.
With the improvement of the living standard of people, people pay more and more attention to the environmental safety and the physical health. Ethanol is the most common volatile organic compound in biomedicine, food and pharmaceutical industry, hygiene, cosmetics and chemical industry, and long-term exposure to ethanol can cause health problems, such as severe irritation to eyes and skin, symptoms of nausea, vomiting and the like, and severe paralysis of central nervous system. Therefore, the real-time detection of the ethanol gas is very important to the health of people and the traffic safety.
The metal oxide semiconductor nano material is considered to be a good gas sensing material by virtue of the unique advantages of high specific surface area, high surface reactivity and the like, and has wide application in the field of gas sensors. In2O3Is considered to be a metal oxide semiconductor material with great development potential. In2O3Has a wider forbidden band width (3.55-3.75 eV), has the advantages of good conductivity and resistivity, and has the characteristics of simple preparation, lower cost, quicker detection and small environmental pollution, and In is compared with the traditional metal oxide2O3Has more excellent sensing performance.
Disclosure of Invention
The invention aims to provide a GO loaded In2O3Nano material, preparation method and application thereofDetecting the application of the ethanol gas.
The GO/In provided by the invention2O3The preparation method of the composite nano material comprises GO preparation and In2O3Preparation of precursor, In loading GO2O3Preparing a nanometer material precursor and calcining.
In the above preparation method, the GO may be prepared by a conventional Hummer method, and specifically, the preparation method may include the following steps:
(1) weighing a certain amount of graphite powder, placing the graphite powder in a beaker, and adding a certain amount of NaNO3And placing in an ice-water bath.
(2) Slowly adding concentrated sulfuric acid under the condition of stirring, and continuing stirring after the concentrated sulfuric acid is added;
(3) weighing a certain amount of potassium permanganate, and slowly adding the potassium permanganate into a beaker under the conditions of stirring and ice-water bath;
(4) then removing the ice water bath, raising the temperature of the reaction system to 30-40 ℃, and continuing stirring;
(5) and slowly adding a certain amount of deionized water into the system, transferring the deionized water into the system at 90-100 ℃ after the addition is finished, and continuously stirring.
(6) Slowly adding the (5) into the deionized water preheated in advance, and continuing stirring.
(7) Adding a certain amount of hydrogen peroxide into the mixture in the step (6), and changing the color. Standing and cooling to room temperature.
(8) And centrifuging and cleaning the product, freeze-drying, and grinding the dried product to obtain the GO.
In the above production method, the In2O3Preparation of the precursor: is In (NO)3)3·xH2Dispersing O in isopropanol, and fully stirring and dissolving; glycerol was added and stirred well until a clear solution was obtained.
In the above preparation method, the precursor of the GO-supported indium oxide nanomaterial is prepared by: which is prepared by mixing GO with In2O3Mixing the precursors and transferring into high-pressure autoclave at 150-250 deg.CHeating for 4-12 hours under the condition of the workpiece, and then carrying out post-treatment to obtain the product. Preferably, the heating time is between 160 ℃ and 200 ℃ for 4 to 6 hours. The post-treatment may include centrifugation, washing, drying of the product.
In the above preparation method, the GO is prepared in advance as GO dispersion, for example, it may be a dispersion of DMF (N, N-dimethylformamide) which is a common solvent.
In the preparation method, the calcining step is to load GO with In2O3The precursor of the nano material is transferred into a muffle furnace and calcined for 2-5h under the conditions that the heating rate is 1-5 ℃/min and the temperature is 300-500 ℃. When the temperature is reduced, the temperature is reduced to the room temperature along with the furnace.
As a more preferable preparation scheme, the following steps can be adopted:
(1) preparing graphene oxide by adopting a traditional Hummer method, and preparing GO dispersion liquid;
(3) 0.4 to 0.6g of In (NO)3)3·xH2Dispersing O in 45-50 mL of isopropanol;
(4) adding 10-20 g of glycerol into the step (3), and fully stirring until a transparent solution is obtained;
(5) adding the GO dispersion liquid into the transparent solution obtained in the step (4), and stirring to form a uniform solution;
(6) transferring the mixed solution in the step (5) into an autoclave, and heating for 5-10 h at 160-200 ℃;
(7) centrifuging, washing and drying the product to obtain a precursor;
(8) transferring the precursor into a muffle furnace, and calcining for 2-5h under the conditions that the heating rate is 2-3 ℃/min and the temperature is 300-400 ℃.
GO/In obtained by the invention2O3The composite nanometer material has GO loading of 0.1-2%, and In loading unchanged2O3The crystal structure of (1). Preferably, the GO loading (mass) is 0.2-1.5%, more preferably 0.3-1.0%, and most preferably about 0.5%.
GO/In of the invention2O3The composite nano material can be applied to ethanol detection, and further, the GO/In2O3The composite nano material can be used as a gas sensitive material to be applied to an ethanol gas sensor. In detection applications, GO is often loaded with In2O3The nano material is dispersed in deionized water and then is dripped on a ceramic tube of a sensing device, so that the material is uniformly coated on the surface of the ceramic tube and is naturally dried. And then placing the sensor coated with the material on an aging table, and aging for 5-12 hours at 200-250 ℃. And then measuring the resistance values of the sensor in the air and ethanol atmosphere by using a gas-sensitive analysis system, thereby realizing the detection of the sensitivity of the ethanol gas, wherein the specific test result is shown in the attached drawing. GO/In2O3The composite nano material has better detection sensitivity to ethanol gas at the temperature of 210-230 ℃, and particularly has the best detection sensitivity to the ethanol gas at the temperature of about 220 ℃.
In loaded with GO prepared by solvothermal method2O3The nano material, graphene oxide, as a novel carbon nano material, has a two-dimensional nano structure, has excellent dispersibility and a larger specific surface area in an aqueous solution, and can provide more active sites of surface oxygen, thereby increasing the sensitivity of the metal oxide semiconductor material. In loaded with GO provided by the invention2O3The nano material has good sensitivity for detecting the ethanol gas, reduces the working temperature of the indium oxide for detecting the ethanol gas (the optimal working temperature of pure indium oxide when the pure indium oxide is used for detecting the ethanol gas is about 280 ℃), meets the requirement of energy conservation to a certain extent, and prolongs the service life of a sensing device. The manufactured sensing device has smaller volume and lower cost, and In is loaded on the basis of GO provided by the invention2O3The gas sensor made of nano material has good gas-sensitive performance for detecting ethanol, 0.5 percent of GO/In2O3The kit has the highest response value to ethanol at 220 ℃, has good selectivity, reproducibility and stability, has an ultralow detection limit (the kit still has good response when the detection limit is 1ppm, and the lowest detection limit is lower than 1ppm), has quick response, and has important significance for detecting ethanol on site in real time.
Drawings
FIG. 1 shows GO/In the present invention2O3X-ray diffraction pattern (XRD) of the composite nanomaterial. As can be seen from the figure, In was produced2O3Nanomaterial and GO-loaded In2O3The diffraction peak of the nano material is similar to that of an indium oxide cubic crystal phase and is well matched with JCPDS PDF 06-0416. And all GO/In2O3The nano-composite materials are all mixed with In2O3The nanomaterials showed similar patterns, indicating that the loading of GO did not alter In2O3The crystal structure of (1).
FIG. 2 shows GO/In the present invention2O3Adsorption and desorption curves (BET) of the composite nanomaterial. It can be seen from the figure that In is pure2O3With 0.5% GO/In2O3The composite nano material conforms to the IV type, which is the adsorption isotherm of the mesoporous material.
FIG. 3 shows GO/In the present invention2O3Composite nano material with different GO loading/In at the optimal working temperature of 220 DEG C2O3The line graph of the sensitivity of the composite nanomaterial to 100ppm ethanol gas. It can be seen from the figure that after GO is loaded, the sensitivity of the GO to ethanol gas is obviously improved, and the sensitivity is highest when the GO loading is 0.5%.
FIG. 4 shows GO/In the present invention2O3The sensitivity of the composite nanomaterial to 100ppm ethanol as a function of temperature it can be seen from the graph that 0.5% GO/In2O3The sensitivity of the nanocomposite to 100ppm ethanol increases and then decreases with increasing temperature and has a response sensitivity of up to 52 ℃ at 220 ℃, so it can be determined that the optimum working temperature of the product obtained in the example is 220 ℃.
FIG. 5 shows GO/In the present invention2O3Response and recovery time, reproducibility, and stability profiles of the composite nanomaterials to 100ppm ethanol at an optimal operating temperature of 220 ℃. As can be seen from the figure, GO/In2O3The response and recovery time of the composite nanomaterial to 100ppm ethanol were 20/135s, respectively, and the composite nanomaterial had better reproducibility among four consecutive measurements over a period of 30 daysHas better stability in measurement.
FIG. 6 shows GO/In the present invention2O3The linear graph of the sensitivity and the ethanol concentration of the composite nano material measured in an ethanol atmosphere with the concentration of 1-200 ppm is obtained, and the graph shows that the material has a good linear relation between the sensitivity and the concentration of ethanol at the working temperature of 220 ℃, and R is20.995. It can be seen that there is still a good response when the concentration of ethanol is 1ppm, from which it can be seen that 0.5% GO/In2O3The lowest detection limit of the composite nano material to ethanol gas is lower than 1 ppm.
Detailed Description
The following examples are further illustrative of the present invention as to the technical content of the present invention, but the essence of the present invention is not limited to the following examples, and one of ordinary skill in the art can and should understand that any simple changes or substitutions based on the essence of the present invention should fall within the protection scope of the present invention.
Example 1
Step 1: 0.6g of graphite powder is weighed into a beaker, and 1.0g of NaNO is added3And placing in an ice-water bath. Slowly adding 35mL of concentrated sulfuric acid under stirring, continuously stirring for 30min after the concentrated sulfuric acid is added, weighing 3.0g of potassium permanganate, slowly adding the potassium permanganate into a beaker under stirring and ice-water bath conditions, removing the ice-water bath, raising the temperature of a reaction system to 35 ℃, continuously stirring for 30min, slowly adding 150mL of deionized water into the system with purple smoke, transferring the deionized water into the system at 98 ℃ after the addition is finished, and continuously stirring for 15 min. It was slowly added to pre-warmed 200mL of deionized water with continued stirring, at which time the product was black. 10mL of hydrogen peroxide solution was added, and the product turned into a brown-yellow liquid. Standing and cooling to room temperature. And centrifugally washing, freeze-drying and grinding to obtain brown-yellow GO powder.
Step 2: 0.03mg of the powder prepared in step 1 was weighed and dispersed in 30mL of DMF to prepare 1mg/L GO dispersion.
And step 3: 0.5g of In (NO)3)3·xH2O is dispersed in 48mL of isopropyl alcohol and dissolved by stirring sufficiently
And 4, step 4: to the mixture of step 3 was added 16g of glycerol and stirred well until a clear solution was obtained.
And 5: 0, 1, 2 and 4mL of the dispersion prepared in step 2 was added to the transparent solution obtained in step 4, and the mixture was stirred to form a uniform solution.
Step 6: the mixed solution of step 5 was transferred to an autoclave and heated at 180 ℃ for 6 hours, respectively.
And 7: and respectively centrifuging, washing and drying the products to obtain the precursor of the GO-loaded indium oxide nano material with different contents.
And 8: and (4) transferring the precursor of the GO-loaded indium oxide nano material with different contents, which is generated in the step (7), into a muffle furnace, and calcining for 3h at the temperature rising rate of 2 ℃/min and the temperature of 350 ℃. Indium oxide nano materials with different GO loads (0, 0.5%, 1% and 2%) can be obtained.
Example 2
In loading GO prepared In example 12O3The nano material is dispersed in deionized water and then is dripped on a ceramic tube of a sensing device, so that the material is uniformly coated on the surface of the ceramic tube and is naturally dried. The sensor coated with the material is placed on an aging table and aged for 10 hours at 220 ℃. And then placing the prepared device in a gas-sensitive analysis system, testing an initial resistance value in the air atmosphere, reacting for 1-2 min, introducing ethanol gas for detection after the resistance value is stable, reacting for 2-4 min, measuring the resistance value in the ethanol atmosphere, opening a gas hood after the resistance value is stable, introducing air, and discharging the ethanol gas. The response sensitivity to ethanol gas is expressed by the ratio of the resistance values of the materials before and after the adsorption of ethanol. Test results showed 0.5% GO loaded In2O3The nano material has the highest detection sensitivity to ethanol gas at 220 ℃, the response sensitivity to 100ppm ethanol is about 52, the lowest detection limit is lower than 1ppm, and the nano material has better selectivity. The results of the tests are shown in FIGS. 3-6.
It should be noted that the technical contents described above are only explained and illustrated to enable those skilled in the art to know the technical spirit of the present invention, and therefore, the technical contents are not to limit the scope of the present invention. The scope of the invention is defined by the appended claims. It should be understood by those skilled in the art that any modification, equivalent replacement, and improvement made based on the spirit of the present invention should be considered to be within the spirit and scope of the present invention.
Claims (9)
1.GO/In2O3The preparation method of the composite nano material comprises GO preparation and In2O3Preparation of precursor, In loading GO2O3Preparing a nanometer material precursor and calcining.
2. The method according to claim 1, wherein the In is2O3Preparation of the precursor: is In (NO)3)3·xH2Dispersing O in isopropanol, and fully stirring and dissolving; then adding glycerol, and fully stirring to obtain a transparent solution.
3. The preparation method of claim 1, wherein the preparation of the precursor of the GO-supported indium oxide nanomaterial is: which is prepared by mixing GO with In2O3Mixing the precursors, transferring the mixture into an autoclave, heating the mixture for 4 to 12 hours at the temperature of between 150 and 250 ℃, and performing post-treatment to obtain the catalyst.
4. The method of claim 1, wherein the GO is pre-configured into a GO dispersion.
5. The method of claim 1, wherein the calcining step is carried out by loading GO with In2O3The precursor of the nano material is transferred into a muffle furnace and calcined for 2-5h under the conditions that the heating rate is 1-5 ℃/min and the temperature is 300-500 ℃.
6. The method of claim 1, comprising the steps of:
(1) preparing graphene oxide by adopting a traditional Hummer method, and preparing GO dispersion liquid;
(3) 0.4 to 0.6g of In (NO)3)3·xH2Dispersing O in 45-50 mL of isopropanol;
(4) adding 10-20 g of glycerol into the step (3), and fully stirring until a transparent solution is obtained;
(5) adding the GO dispersion liquid into the transparent solution obtained in the step (4), and stirring to form a uniform solution;
(6) transferring the mixed solution in the step (5) into an autoclave, and heating for 5-10 h at 160-200 ℃;
(7) centrifuging, washing and drying the product to obtain a precursor;
(8) transferring the precursor into a muffle furnace, and calcining for 2-5h under the conditions that the heating rate is 2-3 ℃/min and the temperature is 300-400 ℃.
7. GO/In obtained by the preparation method of any one of claims 1 to 62O3The composite nanometer material has GO loading of 0.1-2%, and In loading unchanged2O3The crystal structure of (1).
8. The GO/In of claim 72O3The application of the composite nano material in ethanol detection.
9. The use of claim 8, wherein GO/In is present2O3The composite nano material is applied to an ethanol gas sensor as a gas sensitive material.
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| CN114291838A (en) * | 2021-12-10 | 2022-04-08 | 上海理工大学 | In2O3-CNH nano composite material and gas sensor prepared from same |
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