CN1527051A - Organic gas testing nano material method and sensor - Google Patents
Organic gas testing nano material method and sensor Download PDFInfo
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- CN1527051A CN1527051A CNA031600301A CN03160030A CN1527051A CN 1527051 A CN1527051 A CN 1527051A CN A031600301 A CNA031600301 A CN A031600301A CN 03160030 A CN03160030 A CN 03160030A CN 1527051 A CN1527051 A CN 1527051A
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Abstract
The present invention discloses one kind of method and sensor for detecting organic gas with nano material, and belongs to the field of gas sensitive sensor. Based on the principle of nano material with high catalytic activity to produce organic molecular ion and the feature that the electrochemical modification of sensitive material produces no influence on ion measurement, the method determines the concentration of organic gas by means of detecting the current of ions, which is produced in the catalytic reaction process on nano material surface and made to immigrate under electric field in certain direction. The sensor has structure including ceramic substrate, electric heater, electrode with nano catalytic film coated and the opposite electrode. The sensor has high sensitivity, less influence of ambient temperature and humidity, no loss and long service life, and may be produced into miniature device and array by means of filming technology.
Description
Technical field
The invention belongs to the gas sensor field, particularly utilize nano material to detect the method and the sensor of organic gas.
Background technology:
Present gas sensor is many based on electrochemical principle, utilizes the interaction of gas to be measured and sensor material, the variation that causes that electrical properties of sensing material own such as electricity are led etc., thus detect.The weak point of this class sensor is the insufficient sensitivity height, and the galvanochemistry amount of material itself is subjected to the influence of environment temperature and humidity bigger.Ozone and component reaction to be measured that optic ionized sensor utilization ultraviolet ray irradiation produces produce ion, and the electric current that produces under extra electric field by the detection ion detects escaping gas.Because what detect is the directed electric current that moves generation of ion, thereby has very high sensitivity, and can avoid the influence of environment temperature and humidity.But this class sensor needs ultraviolet source, makes sensor construction comparatively complicated; Because the ozone reaction that ion is a sample to be produced with the ultraviolet ray irradiation generates indirectly, so Ionization Efficiency is lower, has influenced the further raising of its sensitivity again.Organic molecule can produce ion when having the solid material surface generation catalytic reaction of catalytic activity.The catalytic activity of nano material is strong, and the catalysis ionized performance is good, and the change of the galvanochemistry amount of nano material own do not influence the measurement of ion, so can avoid the influence of environment temperature and humidity.Similar being operated in reported one piece of microsensor that utilizes carbon nano pipe array electronics emission function to measure some gas on July 10th, 2003 on " Nature " magazine.The high electric field intensity that this sensor utilizes the carbon nano-tube tip to produce under low voltage makes ionization such as helium, argon gas, nitrogen, carbon dioxide, ammonia, air, by detecting two interelectrode strength of current above-mentioned gas is measured.Utilize the catalytic property of nano material to produce ion, the electric current that the detection ion produces under electric field action carries out the research and development of the sensor of organic gas mensuration and also seldom sees.
Summary of the invention
The purpose of this invention is to provide a kind of method and sensor that utilizes nano material to detect organic gas.It is characterized in that: the described method of utilizing nano material to detect organic gas is to utilize organic molecule can produce ion when having the nano-material surface generation catalytic reaction of catalytic activity, by detect ion directed size that moves the electric current that produces under extra electric field that organic molecule produces in nano-material surface-catalyzed course of reaction, determine the concentration of organic gas.Promptly when organic gas is in the organic gas import feeds sensor, bottom electrode above the well heater ceramic bases, making the nano-catalytic film temperature is 100-500 ℃, organic gas and nano-catalytic rete interact, decompose and produce ion, and under applying direct current electric field, make orientation and move, the linear and definite in view of the above organic gas concentration of the size of current of generation and organic gas concentration.
Described nano material is TiO
2, γ-Al
2O
3, Co
3O
4, BaCO
3, SrCO
3In a kind of.
The structure of described sensor is: fix a bottom electrode on the electric heater ceramic bases, the nano-catalytic rete is coated with and constitutes sensitive layer thereon, and other has top electrode relative with it, and in order to detect the ion that produces, the organic gas import is contained in the top electrode middle part.
The invention has the beneficial effects as follows that the characteristics of utilizing the nano material high catalytic activity make the organic molecule ionization, and develop high sensitivity, lossless, long-life gas sensor.Utilize coating technique, can realize the microminiaturization and the array of sensor.Because the catalytic activity of nano material is stronger than similar block materials, the catalysis ionized performance is good, and the change of the galvanochemistry amount of nano material own do not influence the measurement of ion, so the sensor among the present invention can work under lower temperature, and can avoid the influence of environment temperature and humidity.
Description of drawings
Fig. 1 is the sensor construction synoptic diagram with nano-catalytic membrane coat.
Embodiment
Figure 1 shows that sensor construction synoptic diagram with nano-catalytic membrane coat.The formation of sensor: at the center of ceramic bases 1 is resistance heater 3, fixing bottom electrode 2 on substrate 1 surface, and nano-catalytic rete 6 is coated on the bottom electrode 2, at electrode 2 upper fixed top electrodes 4.6 to 100-500 ℃ of heating nano-catalytic membrane coats also add the 200V DC voltage two electrodes 2 and 4, when organic gas is in import 5 feeding sensors, organic gas and 6 interactions of nano-catalytic rete are decomposed the generation ion and are directed mobile under extra electric field, the linear and definite in view of the above organic gas concentration of the size of current of generation and organic gas concentration.Because what detect is the directed electric current that produces that moves of ion, the change of the galvanochemistry amount of nano material own does not influence the measurement of ion, thereby has both had very high sensitivity, can avoid the influence of environment temperature and humidity again.
Several nanosensor examples that material is done of lifting practical application are below again further specified effect of the present invention.
Embodiment one: with nano-TiO
2With the form sintering of powder or film on the electrode on ceramic heater surface.Working temperature is in 200-300 ℃ of scope, and gas of carrier gas is N
2: O
2Combination gas (proportioning is 1: 99-99: in 1 scope), flow velocity is in the 10-100mL/min scope.Get quantitative organic gas, such as 10mL ethanol or acetone or arene compounds, be injected in the carrier gas, take in the reaction chamber and react, the current signal of generation amplifies the back by the automatic record of computer; Perhaps its liquid is positioned in the container, utilizes carrier gas that its steam is taken out of from container, enter into reaction chamber.Current signal is linear change with the variation of gas concentration.As to ethanol liquid, the range of linearity is 0.1-1000 μ g/mL.
Embodiment two: with nanometer γ-Al
2O
3With the form sintering of powder or film on the electrode on ceramic heater surface.Working temperature is in 300-400 ℃ of scope, and gas of carrier gas is N
2: O
2Combination gas (proportioning is 1: 99-99: in 1 scope), flow velocity is in the 10-100mL/min scope.Get quantitative gas, such as 10mL ethanol or acetone or arene compounds, be injected in the carrier gas, take in the reaction chamber and react, the current signal of generation amplifies the back by the automatic record of computer; Perhaps its liquid is positioned in the container, utilizes carrier gas that its steam is taken out of from container, enter into reaction chamber.Current signal is linear change with the variation of gas concentration.As to acetone gas, its range of linearity is 0.10-1000ppm.
Embodiment three: with nano material Co
3O
4With the form sintering of powder or film on the electrode on ceramic heater surface.Working temperature is in 100-200 ℃ of scope, and gas of carrier gas is N
2: O
2Combination gas (proportioning is 1: 99-99: in 1 scope), flow velocity is in the 10-100mL/min scope.Get quantitative gas, such as 10mL ethanol or acetone or arene compounds, be injected in the carrier gas, take in the reaction chamber and react, the current signal of generation amplifies the back by the automatic record of computer; Perhaps its liquid is positioned in the container, utilizes carrier gas that its steam is taken out of from container, enter into reaction chamber.Current signal is linear change with the variation of gas concentration.As to phenylmethane gas, its range of linearity is 1-8000ppm.
Embodiment four: with nano material BaCO
3With the form sintering of powder or film on the electrode on ceramic heater surface.Working temperature is in 200-300 ℃ of scope, and gas of carrier gas is N
2: O
2Combination gas (proportioning is 1: 99-99: in 1 scope), flow velocity is in the 10-100mL/min scope.Get quantitative gas, such as 10mL ethanol or acetone or hydrocarbon gas, be injected in the carrier gas, take in the reaction chamber and react, the current signal of generation amplifies the back by the automatic record of computer; Perhaps its liquid is positioned in the container, utilizes carrier gas that its steam is taken out of from container, enter into reaction chamber.Current signal is linear change with the variation of gas concentration.As to aldehydes gas, its range of linearity is 0.1-1000ppm.
Embodiment five: with nano material SrCO
3With the form sintering of powder or film on the electrode on ceramic heater surface.Working temperature is in 400-500 ℃ of scope, and gas of carrier gas is N
2: O
2Combination gas (proportioning is 1: 99-99: in 1 scope), flow velocity is in the 10-100mL/min scope.Get quantitative gas, such as the 10mL alcohol gas, be injected in the carrier gas, take in the reaction chamber and react, the current signal of generation amplifies the back by the automatic record of computer; Perhaps its liquid is positioned in the container, utilizes carrier gas that its steam is taken out of from container, enter into reaction chamber.Current signal is linear change with the variation of gas concentration.As to alcohol gas, its range of linearity is 0.1-1000ppm.
Claims (3)
1. method of utilizing nano material to detect organic gas, it is characterized in that: utilize organic molecule when nano-material surface generation catalytic reaction, can produce the character of ion, determine the concentration of organic gas according to ion directed size that moves the electric current that produces under extra electric field; Promptly when organic gas is in the organic gas import feeds sensor, bottom electrode above the well heater ceramic bases, making the nano-catalytic film temperature is 100-500 ℃, organic gas and nano-catalytic rete interact, decompose and produce ion, and under applying direct current electric field, make orientation and move, the linear and definite in view of the above organic gas concentration of the size of current of generation and organic gas concentration.
2. according to the described method of utilizing nano material to detect organic gas of claim 1, it is characterized in that: described nano material is TiO
2, γ-Al
2O
3, Co
3O
4, BaCO
3, SrCO
3In a kind of.
3. sensor that utilizes nano material to detect organic gas, it is characterized in that: described sensor construction is to fix a bottom electrode on the electric heater ceramic bases, the nano-catalytic rete is coated with and constitutes sensitive layer thereon, other has top electrode relative with it, and the organic gas import is contained in the top electrode middle part.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03160030 CN1211653C (en) | 2003-09-23 | 2003-09-23 | Organic gas testing nano material method and sensor |
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|---|---|---|---|
| CN 03160030 CN1211653C (en) | 2003-09-23 | 2003-09-23 | Organic gas testing nano material method and sensor |
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|---|---|
| CN1527051A true CN1527051A (en) | 2004-09-08 |
| CN1211653C CN1211653C (en) | 2005-07-20 |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1294414C (en) * | 2005-01-31 | 2007-01-10 | 浙江大学 | Method for producing gas sensor using oriented carbon nano tube layer as gas sensitive layer |
| CN100403021C (en) * | 2005-12-29 | 2008-07-16 | 上海交通大学 | Ionized gas sensor microarray structure based on micro-electronic fabrication technology |
| CN100417939C (en) * | 2005-10-25 | 2008-09-10 | 中国科学院合肥物质科学研究院 | Field-ionization nano gas sensor and manufacturing method |
| CN101793835A (en) * | 2010-03-18 | 2010-08-04 | 中华人民共和国辽宁出入境检验检疫局 | Method for simultaneously detecting hydrogen sulfide and thiol in crude oil by using photoelectric double signals and detector thereof |
| CN101793836A (en) * | 2010-03-18 | 2010-08-04 | 中华人民共和国辽宁出入境检验检疫局 | Method for simultaneously detecting methanol and ethanol in gasoline by using photoelectric double signals and detector thereof |
| CN101799424A (en) * | 2010-03-18 | 2010-08-11 | 中华人民共和国辽宁出入境检验检疫局 | Method for simultaneously detecting ethanol and MTBE (methyl tert-butyl ether) in gasoline by photoelectric double-signal and detector |
| CN103159255A (en) * | 2013-03-15 | 2013-06-19 | 曲阜师范大学 | Lanthanum-yttrium-codoped nano-titanium dioxide gas-sensitive material as well as preparation method and application thereof |
| EP3598120A1 (en) | 2018-07-19 | 2020-01-22 | Hochschule Karlsruhe | Sensor device and method for detecting a hydrocarbon content |
| US20210341406A1 (en) * | 2020-04-22 | 2021-11-04 | University Of Massachusetts | Sensors Comprising Electrically-conductive Protein Nanowires |
| US11823808B2 (en) | 2018-09-19 | 2023-11-21 | University Of Massachusetts | Conductive composite materials fabricated with protein nanowires |
| US11982637B2 (en) * | 2021-04-22 | 2024-05-14 | University Of Massachusetts | Sensors comprising electrically-conductive protein nanowires |
-
2003
- 2003-09-23 CN CN 03160030 patent/CN1211653C/en not_active Expired - Fee Related
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1294414C (en) * | 2005-01-31 | 2007-01-10 | 浙江大学 | Method for producing gas sensor using oriented carbon nano tube layer as gas sensitive layer |
| CN100417939C (en) * | 2005-10-25 | 2008-09-10 | 中国科学院合肥物质科学研究院 | Field-ionization nano gas sensor and manufacturing method |
| CN100403021C (en) * | 2005-12-29 | 2008-07-16 | 上海交通大学 | Ionized gas sensor microarray structure based on micro-electronic fabrication technology |
| CN101793836B (en) * | 2010-03-18 | 2011-09-21 | 中华人民共和国辽宁出入境检验检疫局 | Method for simultaneously detecting methanol and ethanol in gasoline by using photoelectric double signals and detector thereof |
| CN101793836A (en) * | 2010-03-18 | 2010-08-04 | 中华人民共和国辽宁出入境检验检疫局 | Method for simultaneously detecting methanol and ethanol in gasoline by using photoelectric double signals and detector thereof |
| CN101799424A (en) * | 2010-03-18 | 2010-08-11 | 中华人民共和国辽宁出入境检验检疫局 | Method for simultaneously detecting ethanol and MTBE (methyl tert-butyl ether) in gasoline by photoelectric double-signal and detector |
| CN101799424B (en) * | 2010-03-18 | 2011-09-21 | 中华人民共和国辽宁出入境检验检疫局 | Method for simultaneously detecting ethanol and MTBE (methyl tert-butyl ether) in gasoline by photoelectric double-signal and detector |
| CN101793835B (en) * | 2010-03-18 | 2011-09-21 | 中华人民共和国辽宁出入境检验检疫局 | Method for simultaneously detecting hydrogen sulfide and thiol in crude oil by using photoelectric double signals and detector thereof |
| CN101793835A (en) * | 2010-03-18 | 2010-08-04 | 中华人民共和国辽宁出入境检验检疫局 | Method for simultaneously detecting hydrogen sulfide and thiol in crude oil by using photoelectric double signals and detector thereof |
| CN103159255A (en) * | 2013-03-15 | 2013-06-19 | 曲阜师范大学 | Lanthanum-yttrium-codoped nano-titanium dioxide gas-sensitive material as well as preparation method and application thereof |
| CN103159255B (en) * | 2013-03-15 | 2015-03-11 | 曲阜师范大学 | Lanthanum-yttrium-codoped nano-titanium dioxide gas-sensitive material as well as preparation method and application thereof |
| EP3598120A1 (en) | 2018-07-19 | 2020-01-22 | Hochschule Karlsruhe | Sensor device and method for detecting a hydrocarbon content |
| DE102018212089A1 (en) * | 2018-07-19 | 2020-01-23 | Hochschule Karlsruhe | Sensor device and a method for detecting a hydrocarbon fraction |
| US11823808B2 (en) | 2018-09-19 | 2023-11-21 | University Of Massachusetts | Conductive composite materials fabricated with protein nanowires |
| US20210341406A1 (en) * | 2020-04-22 | 2021-11-04 | University Of Massachusetts | Sensors Comprising Electrically-conductive Protein Nanowires |
| US11982637B2 (en) * | 2021-04-22 | 2024-05-14 | University Of Massachusetts | Sensors comprising electrically-conductive protein nanowires |
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| Publication number | Publication date |
|---|---|
| CN1211653C (en) | 2005-07-20 |
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