Resistive NO2 sensor based on oxygen-vacancy-rich tin dioxide modified graphene composite material, preparation method and application thereof

A composite material, tin dioxide technology, applied in graphene-based resistive gas sensor, NO2 detection application, resistive NO2 sensor field, can solve the problems of low sensor sensitivity, slow response recovery rate, etc., to improve the specific surface area , Improve the conductivity at room temperature, and the structure is easy to adjust

Active Publication Date: 2019-02-15
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have found that graphene materials can indeed detect gases at room temperature, but the sensors produced have low sensitivity and slow response recovery rate

Method used

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  • Resistive NO2 sensor based on oxygen-vacancy-rich tin dioxide modified graphene composite material, preparation method and application thereof
  • Resistive NO2 sensor based on oxygen-vacancy-rich tin dioxide modified graphene composite material, preparation method and application thereof
  • Resistive NO2 sensor based on oxygen-vacancy-rich tin dioxide modified graphene composite material, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Using a ceramic sheet as a substrate, deposit carbon interdigitated electrodes on the surface of the ceramic sheet by screen printing technology. The thickness of the electrode is 1 μm, the number of pairs of electrodes is 4 pairs, and the width of each electrode is 50 μm;

[0031] (2) ultrasonically clean the surface with ethanol and water successively to prepare the ceramic sheet substrate with carbon interdigitated electrodes, and dry;

[0032] (3) Prepare graphene oxide aqueous solution, the concentration of graphene oxide aqueous solution is 0.1mg / mL, the volume is 30mL above-mentioned solution under 160 ℃ condition hydrothermal reaction 12 hours, makes reduced graphene oxide solution;

[0033] (4) then add the tin tetrachloride of 0.012g in the reduced graphene oxide solution that step (3) prepares, ultrasonic dispersion makes it mix fully, the mass consumption ratio of reduced graphene oxide, tin tetrachloride and water is 1 : 5: 12500; The above solution was...

Embodiment 2

[0036] (1) Using a ceramic sheet as a substrate, deposit carbon interdigitated electrodes on the surface of the ceramic sheet by screen printing technology. The thickness of the electrode is 1 μm, the number of pairs of electrodes is 4 pairs, and the width of each electrode is 50 μm;

[0037] (2) ultrasonically clean the surface with ethanol and water successively to prepare the ceramic sheet substrate with carbon interdigitated electrodes, and dry;

[0038] (3) Prepare graphene oxide aqueous solution, the concentration of graphene oxide aqueous solution is 0.5mg / mL, the volume is 30mL above-mentioned solution under the condition of 160 ℃ of hydrothermal reaction for 12 hours, makes reduced graphene oxide solution;

[0039] (4) then add the tin tetrachloride of 0.024g in the reduced graphene oxide solution prepared in step (3), ultrasonic dispersion makes it mix fully, the mass consumption ratio of reduced graphene oxide, tin tetrachloride and water is 1 : 2: 150~2500; the abo...

Embodiment 3

[0042] (1) Using a ceramic sheet as a substrate, deposit carbon interdigitated electrodes on the surface of the ceramic sheet by screen printing technology. The thickness of the electrode is 1 μm, the number of pairs of electrodes is 5 pairs, and the width of each electrode is 70 μm;

[0043] (2) ultrasonically clean the surface with ethanol and water successively to prepare the ceramic sheet substrate with carbon interdigitated electrodes, and dry;

[0044] (3) Prepare graphene oxide aqueous solution, the concentration of graphene oxide aqueous solution is 1mg / mL, the volume is 30mL above-mentioned solution under the condition of 170 ℃ of hydrothermal reaction for 18 hours, makes reduced graphene oxide solution;

[0045] (4) then add the tin tetrachloride of 0.048g in the reduced graphene oxide solution that step (3) prepares, ultrasonic dispersion makes it mix fully, and the mass consumption ratio of reduced graphene oxide, tin tetrachloride and water is 1 : 2: 470; The abov...

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Abstract

The invention provides a resistive NO2 sensor based on an oxygen-vacancy-rich tin dioxide modified graphene composite material, a preparation method and an application thereof, and belongs to the technical field of gas sensors. In the resistive NO2 sensor, a ceramic wafer is used as a substrate, a carbon interdigital electrode is deposited on the surface of the ceramic wafer substrate by screen printing technology, a lead is connected to the carbon interdigital electrode, and a gas sensitive film is coated on the surface of the ceramic wafer substrate and the carbon interdigital electrode. Thegas sensitive film is an oxygen-vacancy-rich tin dioxide modified graphene composite material. According to the resistive NO2 sensor based on an oxygen-vacancy-rich tin dioxide modified graphene composite material, the preparation method and the application thereof, tin dioxide nanoparticles are generated on the surface of the graphene by a wet chemistry method, thereby significantly improving the combination of the tin dioxide and a carbon-based material, improving the room temperature conductivity of the material, and facilitating the room temperature detection. A prepared composite solution can be coated on the interdigitated electrode by a coating method such as spin coating to form a film, easy to process, and the gas sensor can be conveniently prepared, which solves the problems that the conventional metal oxide gas sensor requires high sintering temperatures and is complicated to process.

Description

technical field [0001] The invention belongs to the technical field of gas sensors, and in particular relates to a graphene-based resistive gas sensor with room temperature gas-sensitive response characteristics and a manufacturing method thereof, in particular to a graphene composite material modified with tin dioxide rich in oxygen vacancies Resistive NO 2 Sensor, preparation method and its performance in detecting NO 2 in the application. Background technique [0002] With the rapid development of industry and agriculture and the continuous growth of the number of motor vehicles, the emission of nitrogen oxides is increasing, which seriously damages the natural environment and human health, and the environmental pollution problems are becoming more and more prominent. Accurate and continuous detection of nitrogen oxides in the environment has become an urgent problem to be solved, which provides a broad space for the application of gas sensors. Gas sensors are an impor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30
CPCG01N27/304
Inventor 刘森张彤王子莹费腾
Owner JILIN UNIV
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