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ZnO nano wall/RGO heterojunction gas-sensitive sensor and preparation method thereof

A gas-sensing sensor, nano-wall technology, applied in instruments, scientific instruments, measuring devices, etc., can solve the problems of high working temperature of the sensor, long response-recovery time, etc., to shorten the response-recovery time, improve the gas-sensing sensitivity, The effect of increasing the electron transfer rate

Active Publication Date: 2015-11-04
XIAN TECHNOLOGICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a ZnO nano-wall / RGO heterojunction gas sensor and its preparation method, to overcome the problems of high sensor operating temperature and long response-recovery time due to poor contact between ZnO and graphene in the prior art question

Method used

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  • ZnO nano wall/RGO heterojunction gas-sensitive sensor and preparation method thereof
  • ZnO nano wall/RGO heterojunction gas-sensitive sensor and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0065] 1. Preparation of reduced graphene film

[0066] 1. Put the interdigital electrode in the mixed solution (deionized water: ammonia water: hydrogen peroxide = 5:1:1), perform ultrasonic cleaning, and then put it on a porcelain boat and wait for it to dry.

[0067] 2. Measure 1ml of graphene oxide solution, add deionized water to dilute to 1000ml, and sonicate for 1h.

[0068] 3. After ultrasonic uniformity, vacuum filter with a 0.45um filter membrane, wash with 1000ml of deionized water, and then use a 0.45um filter membrane for suction filtration.

[0069] 4. Cut the 0.45μm filter membrane to the same size as the interdigital electrode. Drop isopropanol on the interdigital electrode in advance, and then place the filter membrane on the interdigital electrode so that the filter membrane is close to the substrate, and then slowly add acetone dropwise until it is completely saturated.

[0070] 5. Pour 25mL of acetone into the petri dish, drain the air bubbles between the...

Embodiment 2

[0080] 1. Preparation of reduced graphene film

[0081] 1. Put the interdigital electrode in the mixed solution (deionized water: ammonia water: hydrogen peroxide = 5:1:1), perform ultrasonic cleaning, and then put it on a porcelain boat and wait for it to dry.

[0082] 2. Measure 2ml of graphene oxide solution, add deionized water to dilute to 1000ml, and sonicate for 1h.

[0083] 3. After ultrasonic uniformity, vacuum filter with a 0.45μm filter membrane, wash with 1000ml of deionized water, and then filter with a 0.45um filter membrane.

[0084] 4. Cut the 0.45um filter membrane to the same size as the interdigitated electrode. Drop isopropanol on the interdigital electrode in advance, and then place the filter membrane on the interdigital electrode so that the filter membrane is close to the substrate, and then slowly add acetone dropwise until it is completely saturated.

[0085] 5. Pour 25mL of acetone into the petri dish, drain the air bubbles between the filter membr...

Embodiment 3

[0095] 1. Preparation of reduced graphene film

[0096] 1. Put the interdigital electrode in the mixed solution (deionized water: ammonia water: hydrogen peroxide = 5:1:1), perform ultrasonic cleaning, and then put it on a porcelain boat and wait for it to dry.

[0097] 2. Measure 2ml of graphene oxide solution, add deionized water to dilute to 1000ml, and sonicate for 2h.

[0098] 3. After ultrasonication, vacuum filter with 0.45um filter membrane and wash with 1000ml deionized water.

[0099] 4. Cut the 0.45um filter membrane to the same size as the interdigitated electrode. Drop isopropanol on the interdigital electrode in advance, and then place the filter membrane on the interdigital electrode so that the filter membrane is close to the substrate, and then slowly add acetone dropwise until it is completely saturated.

[0100] 5. Pour 25mL of acetone into the petri dish, drain the air bubbles between the filter membrane and the Ag interdigitated electrode, put the electr...

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Abstract

The invention relates to a ZnO nano wall / RGO heterojunction gas-sensitive sensor and a preparation method thereof. In the prior art, problems of high sensor work temperature and long response-recovery time due to poor contact of ZnO and graphene are existed. According to the invention, combination of vacuum pumping filtration and a thermal reduction method is employed for reducing a graphene film on an Ag interdigital electrode; then a monocrystalline ZnO nano wall is performed with in-situ growth on the surface of the graphene film by using an aqueous solution method; the constructed ZnO nano wall / RGO heterojunction are performed with high temperature heat treatment under Ar atmosphere, and the ZnO nano wall / RGO heterojunction gas-sensitive sensor can be obtained. According to the ZnO nano wall / RGO heterojunction, the ZnO nano wall is performed with in-situ growth on the surface of the RGO film, strong active force connection of a covalent bond or a chemical bond can be realized, the unique advantage of the ZnO nano wall on the high sensitivity detection aspect can be performed, and the electronic transmission rate can be increased by taking graphene as a termination electrode.

Description

technical field [0001] The invention belongs to the technical field of gas sensors, and in particular relates to a ZnO nano-wall / RGO heterojunction gas sensor and a preparation method thereof. Background technique [0002] Haze weather is a new kind of disastrous weather that has appeared in recent years. It not only has great harm to traffic, industrial and agricultural production, but also has great harm to human respiratory system and cardiovascular system. NO x It is one of the toxic substances in the exhaust gas of chemical industry, national defense industry, electric power industry, boiler and internal combustion engine, etc. It is also a major factor that directly leads to hazy days, ozone destruction and air pollution in various parts of our country. Therefore, research on room temperature NO with high sensitivity, high selectivity and fast response x Gas sensor, for NO x It is urgent to carry out real-time and accurate detection, control and alarm of emissio...

Claims

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Application Information

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IPC IPC(8): G01N27/00
Inventor 于灵敏刘盛祁立军杨冰郭芬范新会
Owner XIAN TECHNOLOGICAL UNIV
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