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Graphene-modified doped tin oxide composite material and preparation method thereof

A composite material and tin oxide technology, which is applied in the analysis of materials, material analysis by electromagnetic means, and measurement devices, can solve the problems that have not been found and reported, and achieve good gas-sensing properties, simple and easy preparation methods, and uniform particle size Effect

Active Publication Date: 2012-11-14
UNIV OF SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the detection of some dangerous gases by graphene sensors, such as methane, has not been reported so far.

Method used

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  • Graphene-modified doped tin oxide composite material and preparation method thereof
  • Graphene-modified doped tin oxide composite material and preparation method thereof
  • Graphene-modified doped tin oxide composite material and preparation method thereof

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preparation example Construction

[0035] The preparation method of the doped tin oxide composite material modified by graphene provided by the invention can refer to figure 1 The schematic diagram of the preparation process includes the following steps:

[0036] a) disperse graphite oxide containing hydroxyl, carboxyl or epoxy groups into water, preferably ultrasonic dispersion or high-speed dispersion; add tin tetrachloride or crystalline tin tetrachloride and alcohol solution of dopant, dopant is preferably Antimony chloride, indium chloride, palladium chloride, manganese chloride, zinc chloride, ferric chloride or zinc sulfate, the alcohol solvent of the alcohol solution is preferably methanol, ethanol, 1-propanol, 2-propanol, 1 One or more of -butanol or 2-butanol, the mass ratio of graphite oxide to tin tetrachloride or crystalline tin tetrachloride can be 10:1~1:10, tin tetrachloride or crystalline tetrachloride The mass ratio of the tin oxide to the dopant may be 20:1˜1:20.

[0037] Then add ammonia w...

Embodiment 1

[0044] Add 1.0g of tin tetrachloride and 0.1g of antimony chloride to 50ml of ethanol to form a solution, add 0.1g of graphite oxide powder into 100ml of deionized water, and ultrasonically disperse for 1 hour, then add the above-mentioned tin tetrachloride and antimony chloride Ethanol solution, after mixing evenly, add 10ml of ammonia water and 1ml of hydrazine hydrate, react at 60°C for 2h, then raise the temperature to 100°C and continue to react for 4h, cool and centrifuge to obtain the precipitate, wash it with deionized water for 3 times, dry it, and put it in a tube furnace under nitrogen Burn at 400°C for 2 hours under protection to obtain a graphene-modified tin-antimony oxide composite material.

[0045] Mix the graphene-modified tin-antimony oxide composite material and kaolin evenly to make a slurry, coat the slurry on a high-resistance silicon wafer with a conductive electrode and cover the electrode, sinter at 400°C, and connect the leads to obtain Graphene modi...

Embodiment 2

[0048] Add 0.1g of tin tetrachloride and 1.0g of indium chloride into 50ml of ethanol to make a solution, add 0.1g of graphite oxide powder into 100ml of deionized water, ultrasonically disperse for 1 hour, and then add the above-mentioned tin tetrachloride and indium chloride Ethanol solution, after mixing evenly, add 10ml of ammonia water and 1g of sodium borohydride, react at 35°C for 2h, then raise the temperature to 100°C and continue to react for 4h, cool and centrifuge to obtain a precipitate, wash it with deionized water for 3 times, dry it, and put it in a tube furnace Burning at 600°C for 2 hours under the protection of nitrogen, the graphene-modified tin-antimony oxide composite material was obtained.

[0049] Mix the graphene-modified indium tin oxide composite material and silicon dioxide evenly to make a slurry, coat the slurry on a ceramic sheet with a conductive electrode and cover the electrode, sinter at 600°C, connect the lead wires, and obtain graphite Alke...

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Abstract

The invention provides a preparation method of a graphene-modified doped tin oxide composite material, which comprises the following steps: a) dispersing graphite oxide containing hydroxy group, carboxyl group or epoxy group in water, adding tin tetrachloride or crystalline tin tetrachloride and an alcoholic solution of dopant, and adding ammonia water and a reducer to react until a precipitate comes out; and b) filtering out the precipitate, drying, and sintering under inert gas shielding to obtain the graphene-modified doped tin oxide composite material. The invention also provides a gas sensor prepared from the composite material. By introducing the graphene to modify the doped tin oxide, the graphene-modified doped tin oxide composite material has large specific area and uniform nano particle size, and the preparation method is simple and easy to implement; and compared with the doped tin oxide gas sensor, the gas sensor prepared from the composite material provided by the invention has high gas sensitivity, and is suitable for monitoring atmospheric environment and pit gas leakage.

Description

technical field [0001] The invention relates to the field of gas sensors, in particular to a graphene-modified doped tin oxide composite material and a preparation method thereof. Background technique [0002] Nanomaterials have the characteristics of large specific surface area and electrical properties sensitive to surface adsorption. Applying nanotechnology to the field of sensing is expected to produce sensor devices with fast response, high sensitivity and good selectivity. Semiconducting metal oxides, especially tin oxide-based nanomaterials, have attracted extensive attention due to their superior optical, electrical, and gas sensing properties. Studies have shown that doping can further improve the gas sensing performance of tin oxide-based nanomaterials (Microelectronic Engineering 2010, 87, 1467-1470). Although tin oxide-based gas sensors have made some achievements, their sensitivity and selectivity still need to be further improved. Reducing the particle size a...

Claims

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Application Information

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IPC IPC(8): G01N27/00
Inventor 胡源王鑫宋磊邢伟义
Owner UNIV OF SCI & TECH OF CHINA
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