CN214472936U - Carbon monoxide gas sensor based on graphene aerosol material - Google Patents
Carbon monoxide gas sensor based on graphene aerosol material Download PDFInfo
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- CN214472936U CN214472936U CN202120366191.9U CN202120366191U CN214472936U CN 214472936 U CN214472936 U CN 214472936U CN 202120366191 U CN202120366191 U CN 202120366191U CN 214472936 U CN214472936 U CN 214472936U
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- carbon monoxide
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- monoxide gas
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Abstract
The utility model discloses a carbon monoxide gas sensor based on graphite alkene aerosol material relates to semiconductor gas sensor technical field, include: the bottom layer is a polyimide flexible substrate, the surface layer is a polyurethane coating, the high-precision silver electrode and the surface layer is a TrGO sensing material layer; the surface layer TrGO sensing material layer is prepared by combining graphene and a tin dioxide nano material to form graphene aerosol through a printing electronic process. Through the implementation of the utility model, the thermal stability of the material is improved, the energy consumption of the device is reduced, and the generation of inflammable and explosive gas in a high-temperature ignition monitoring environment is avoided; meanwhile, the thickness of the sensing coating is reduced to the minimum by utilizing the technology of the printed electronic device, so that the sensitivity and the response/recovery time of the sensor are effectively improved; the material cost and the physical volume of the device are reduced, the reliability of the device under physical impact (bending, stretching and the like) is improved, and meanwhile, low-cost large-scale production can be effectively carried out.
Description
Technical Field
The utility model relates to a semiconductor gas sensor field especially relates to a carbon monoxide gas sensor based on graphite alkene aerosol material.
Background
Carbon monoxide is a colorless, odorless and nonirritating gas, generally generated by incomplete combustion of carbon-containing substances or generated in leakage of liquefied gas pipelines, industrial production gas and coal mining, is also a combustible and explosive dangerous gas, has a mixed explosion limit of 12% -75% with air, is combined with hemoglobin in blood, has an affinity which is more than 200 times higher than that of oxygen and hemoglobin, and can cause hypoxia and toxic symptoms when too much carbon monoxide is absorbed in a short time, and can cause serious damage or even death of a nervous system when the carbon monoxide is seriously damaged. Therefore, the detection and monitoring of the concentration of the carbon monoxide gas are required in the fields of daily air quality detection, hazardous chemical transport gas monitoring and industrial environmental safety monitoring.
The traditional semiconductor type gas sensing mainly comes from the electron exchange between adsorbed gas and sensing material, when carbon monoxide gas contacts with tin dioxide nano particles, an electron is given, and the electron can cause the energy band of the tin dioxide semiconductor material to change, so that the resistance value of the tin dioxide semiconductor material changes. The method improves the overall porosity of the tin dioxide material and provides a better channel for the adsorption and desorption of carbon monoxide gas. However, the gas sensor in the prior art has the disadvantages of low sensing performance, low signal strength (low sensitivity) and slow signal response/recovery speed; the energy consumption is high, and the sensing is carried out at the temperature of 200 ℃ and 400 ℃; the service life of the material is short, and the service life of the sensing material is obviously reduced under the high-temperature working condition.
Therefore, those skilled in the art have made efforts to develop a carbon monoxide gas sensor based on a graphene aerosol material, which can improve sensing performance, reduce power consumption, and increase the lifetime of the sensing material.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned defects in the prior art, the technical problem to be solved by the present invention is: the defects of high energy consumption and short service life caused by low sensitivity of the gas sensor and the need of working under a high-temperature condition are overcome.
In order to achieve the above object, the present invention provides a carbon monoxide gas sensor based on graphene aerosol material, including: the bottom layer is a polyimide flexible substrate, the surface layer is a polyurethane coating, the high-precision silver electrode and the surface layer is a TrGO sensing material layer; the surface layer TrGO sensing material layer is prepared by combining graphene and a tin dioxide nano material to form graphene aerosol through a printing electronic process.
Further, the graphene and tin dioxide nano-materials decorate tin dioxide metal oxide particles on the surface of the graphene by using an inorganic chemical synthesis means.
Further, the graphene is a two-dimensional material.
Further, the tin dioxide nano material is tin dioxide nano particles, and the tin dioxide nano particles are synthesized by a high-temperature high-pressure hydrothermal method.
Further, the graphene aerosol has a three-dimensional structure.
Further, the graphene aerosol has large pores inside.
Further, the graphene aerosol is printed on the sensor by adopting a printing electronic process to form a sensing material coating.
Further, the thickness of the sensing material coating is 500 nm.
Further, a pn junction is formed between the tin dioxide nanoparticles and the graphene.
Further, the pn junction forms an electron transfer path.
Compared with the prior art, the utility model discloses following beneficial technological effect has at least:
1. the utility model discloses use graphite alkene to realize the performance that the sensor can work at room temperature. The defect that the working temperature of the traditional carbon monoxide gas sensor is about 200 ℃ is overcome. The thermal stability of the material is improved, the energy consumption of the device is reduced, and the generation of inflammable and explosive gas in a high-temperature ignition monitoring environment is avoided.
2. The utility model utilizes the technology of printed electronic devices, the thickness of the sensing coating is reduced to the minimum, and the sensitivity and the response/recovery time of the sensor are effectively improved; the material cost and the physical volume of the device are reduced, the reliability of the device under physical impact (bending, stretching and the like) is improved, and meanwhile, low-cost large-scale production can be effectively carried out.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings, so as to fully understand the objects, the features and the effects of the present invention.
Drawings
Fig. 1 shows the sensing principle of the TrGO sensing material of the carbon monoxide gas sensor of the present invention;
fig. 2 is a schematic diagram of TrGO sensing material of the carbon monoxide gas sensor of the present invention;
FIG. 3 is a schematic view of the pn junction principle of the carbon monoxide gas sensor of the present invention;
fig. 4 is a schematic structural view of the carbon monoxide gas sensor of the present invention;
wherein: 1-SnO2A nanoparticle; 2-graphene; 3-CO; 4-a bottom layer polyimide flexible substrate; 5-surface layer TrGO sensing material layer; 6-high precision silver electrode.
Detailed Description
The preferred embodiments of the present invention will be described below with reference to the accompanying drawings for clarity and understanding of the technical contents. The present invention may be embodied in many different forms of embodiments, and the scope of the invention is not limited to the embodiments described herein.
In the drawings, structurally identical elements are represented by like reference numerals, and structurally or functionally similar elements are represented by like reference numerals throughout the several views. The size and thickness of each component shown in the drawings are arbitrarily illustrated, and the present invention is not limited to the size and thickness of each component. The thickness of the components may be exaggerated where appropriate in the figures to improve clarity.
As shown in fig. 4, the embodiment of the utility model provides a carbon monoxide gas sensor based on graphite alkene aerosol material, bottom polyimide flexible substrate 4, top layer polyurethane coating, high accuracy silver electrode 6 and top layer TrGO sensing material layer 5, top layer TrGO sensing material layer 5 have promoted sensing performance, and the leading principle is as shown in fig. 1-3.
The semiconductor type gas sensing mainly comes from the electron exchange between the adsorbed gas and the sensing material, when carbon monoxide gas contacts with the tin dioxide nano-particles, an electron is given, and the electron can cause the energy band of the tin dioxide semiconductor material to change, so that the resistance value of the tin dioxide semiconductor material changes. In order to create a better contact environment for carbon monoxide and tin dioxide materials, it is a common practice to synthesize tin dioxide nanoparticles by a high-temperature high-pressure hydrothermal method. The method improves the overall porosity of the tin dioxide material and provides a better channel for the adsorption and desorption of carbon monoxide gas. On the basis of tin dioxide nanoparticles, graphene two-dimensional materials are used. Graphene, another widely used semiconductor material, also undergoes electron exchange when carbon monoxide gas is adsorbed/desorbed on the surface of graphene, thereby causing a change in resistance value. By using an inorganic chemical synthesis means, the graphene and the tin dioxide nano material are combined, and the response strength of the sensing material to carbon monoxide gas is further improved.
After the product obtained by the inorganic chemical synthesis process is frozen and dried, the three-dimensional structure TrGO aerosol can be obtained. The density of the three-dimensional TrGO aerosol is extremely low, the porosity is high, and the adsorption/desorption process of carbon monoxide gas and the TrGO sensing material is further facilitated.
In the semiconductor resistance type gas sensor, the thinner the sensing material is, the stronger the gas response signal is, and the faster the response speed is. The thickness of the sensing material coating of the traditional semiconductor resistance type gas sensor is between 5 and 10 microns. Through a printing electronic process, the coating of the sensing material reaches 500 nanometers, and the coating thickness of the sensing material is reduced to the maximum extent on the premise that the contact among sensing material particles is good, so that the highest gas response signal and the fastest response speed are obtained.
In conventional tin dioxide nano-sensing materials, the flow of electrons between tin dioxide nano-particles is often hindered due to the semiconductor properties of tin dioxide, so in order to achieve the sensing process, the material needs to be heated to an optimum temperature of 200-. The sensing principle of the TrGO sensing material of the embodiment is shown in fig. 3, the semiconductor type gas sensing mainly comes from the electron exchange between the adsorbed gas and the sensing material, when the carbon monoxide gas contacts with the tin dioxide nanoparticles, an electron is given, and the electron can cause the energy band of the tin dioxide semiconductor material to change, so that the resistance value of the tin dioxide semiconductor material changes. After the tin dioxide nanoparticles are decorated on the surface of graphene and form a TrGO sensing material, electrons obtained by the tin dioxide from carbon monoxide gas are further conducted to a graphene two-dimensional layer, and at the moment, a pn junction is formed between the tin dioxide nanoparticles and the graphene material, so that an electron transmission path is optimized. Meanwhile, the electron flow speed on the two-dimensional surface layer of the graphene is extremely high, and the circulation is completely barrier-free. Electrons can smoothly flow to the other end of the electrode from one end of the electrode through the two-dimensional graphene surface layer without any thermodynamic process acceleration. So that the sensing material realizes room temperature sensing.
The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the teachings of this invention without undue experimentation. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. A graphene aerosol material-based carbon monoxide gas sensor, comprising: the bottom layer is a polyimide flexible substrate, the surface layer is a polyurethane coating, the high-precision silver electrode and the surface layer is a TrGO sensing material layer; the surface layer TrGO sensing material layer is prepared by combining graphene and a tin dioxide nano material to form graphene aerosol through a printing electronic process.
2. The carbon monoxide gas sensor according to claim 1, wherein the graphene and tin dioxide nanomaterial is obtained by decorating tin dioxide metal oxide particles on the surface of graphene by using inorganic chemical synthesis means.
3. The carbon monoxide gas sensor of claim 2, wherein the graphene is a two-dimensional material.
4. The carbon monoxide gas sensor according to claim 2, wherein the tin dioxide nanomaterial is tin dioxide nanoparticles, and the tin dioxide nanoparticles are synthesized by a high temperature and high pressure hydrothermal method.
5. The carbon monoxide gas sensor according to claim 2, wherein the graphene aerosol has a three-dimensional structure.
6. The carbon monoxide gas sensor according to claim 5, wherein the graphene aerosol has macropores inside.
7. The carbon monoxide gas sensor of claim 5, wherein the graphene aerosol is printed on the sensor using a printed electronics process to form a sensing material coating.
8. The carbon monoxide gas sensor of claim 7, wherein the sensing material coating thickness is 500 nm.
9. The carbon monoxide gas sensor of claim 7, wherein the tin dioxide nanoparticles form a pn junction with the graphene.
10. The carbon monoxide gas sensor of claim 9, wherein the pn junction forms an electron transmission path.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120366191.9U CN214472936U (en) | 2021-02-09 | 2021-02-09 | Carbon monoxide gas sensor based on graphene aerosol material |
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| CN202120366191.9U CN214472936U (en) | 2021-02-09 | 2021-02-09 | Carbon monoxide gas sensor based on graphene aerosol material |
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