Preparation method of three dimensional rGO / In2O3 composite room temperature gas-sensitive material

A gas-sensing material, in2o3 technology, applied in the field of preparation of composite room-temperature gas-sensing materials, can solve problems such as high-tech deep processing exploration is still in its infancy

Inactive Publication Date: 2017-11-10
UNIV OF JINAN
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

my country is the country with the most abundant graphite resources, and it is also a maj

Method used

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  • Preparation method of three dimensional rGO / In2O3 composite room temperature gas-sensitive material
  • Preparation method of three dimensional rGO / In2O3 composite room temperature gas-sensitive material
  • Preparation method of three dimensional rGO / In2O3 composite room temperature gas-sensitive material

Examples

Experimental program
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Effect test

Embodiment 1

[0012] (1) Weigh 240 mg of graphene oxide GO, and ultrasonically disperse it in 30 mL of deionized water to obtain a GO colloidal solution, in which the concentration of GO is 8 mg / mL;

[0013] (2) Weigh 0.027mol / l indium chloride tetrahydrate, 0.16mol / l trisodium citrate and 0.013mol / l urea, dissolve them into the GO colloidal solution obtained in step (1), stir at room temperature for 1 hour, and control The molar ratio of indium chloride tetrahydrate to trisodium citrate is 1:5.9, and the molar ratio of indium chloride tetrahydrate to urea is 1:0.48;

[0014] (3) Place the mixed solution obtained in step (2) in a reaction kettle and incubate at 140°C for 24 hours in an incubator, collect the solid product by centrifugation, wash with deionized water and absolute ethanol several times, and put it in a freeze-drying box at -50°C Dry at high temperature for 24 hours, and then perform high-temperature calcination in a tube furnace under the protection of Ar atmosphere. The calc...

Embodiment 2

[0016] (1) Weigh 150 mg of graphene oxide GO, and ultrasonically disperse it in 30 mL of deionized water to obtain a GO colloidal solution, in which the concentration of GO is 5 mg / mL;

[0017] (2) Weigh 0.02mol / l indium chloride tetrahydrate, 0.1mol / l trisodium citrate and 0.01mol / l urea, dissolve into the GO colloidal solution obtained in step (1), stir at room temperature for 1 hour, and control The molar ratio of indium chloride tetrahydrate to trisodium citrate is 1:5, and the molar ratio of indium chloride tetrahydrate to urea is 1:0.5;

[0018] (3) Place the mixed solution obtained in step (2) in a reaction kettle and incubate at 160°C for 20 hours in a constant temperature box, collect the solid product by centrifugation, wash it with deionized water and absolute ethanol several times, and put it in a freeze-drying box at -50 Dry at high temperature for 30 hours, and then perform high-temperature calcination in a tube furnace under the protection of Ar atmosphere. The ...

Embodiment 3

[0020] (1) Weigh 300 mg of graphene oxide GO, and ultrasonically disperse it in 30 mL of deionized water to obtain a GO colloidal solution, in which the concentration of GO is 10 mg / mL;

[0021] (2) Weigh 0.025mol / l indium chloride tetrahydrate, 0.15mol / l trisodium citrate and 0.015mol / l urea, dissolve into the GO colloidal solution obtained in step (1), stir at room temperature for 1 hour, and control The molar ratio of indium chloride tetrahydrate to trisodium citrate is 1:6, and the molar ratio of indium chloride tetrahydrate to urea is 1:0.6;

[0022] (3) Put the mixed solution obtained in step (2) in a reaction kettle and incubate at 150°C for 28 hours in a constant temperature box, collect the solid product by centrifugation, wash with deionized water and absolute ethanol several times, and put it in a freeze-drying box at -50°C Dry at high temperature for 38 hours, and then perform high-temperature calcination in a tube furnace under the protection of Ar atmosphere. The...

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Abstract

The invention provides a preparation method of a rGO / In2O3 composite room temperature gas-sensitive material with mesoporous structure cubic In2O3 grown on three dimensional reduction graphene oxide (rGO). The preparation method includes the following steps: using graphene oxide GO, tetrahydrate indium trichloride and urea as raw materials, and using trisodium citrate as a surfactant and a reductant for hydrothermal method and calcinations to obtain the omposite room temperature gas-sensitive material with the mesoporous structure cubic In2O3 uniformly distributed on a three dimensional rGO carrier overlapped into a pore structure. The production process is simple. The prepared mesoporous structure cubic In2O3 is uniformly distributed on the three dimensional rGO carrier overlapped into the pore structure, and the gas-sensitive detection material with sensitivity to trimethylamine gas at room temperature is obtained.

Description

technical field [0001] The invention relates to a three-dimensional rGO / In 2 o 3 The invention discloses a method for preparing a composite room-temperature gas-sensitive material, belonging to the technical field of advanced nanometer material preparation technology. Background technique [0002] In recent years, food safety has attracted much attention. Seafood contains a large amount of trimethylamine oxide, which is easily decomposed into formaldehyde and dimethylamine under the action of biological enzymes, and trimethylamine (Trimethylamine, TMA ), which are precursors of carcinogen nitrosamines. Therefore, as one of the chemical indicators of fish freshness, trimethylamine is related to the safety and health of human beings, and the research on its gas sensitivity has attracted more and more attention. At present, the trimethylamine gas sensor is based on TiO 2 , ZnO is the main gas-sensing material. However, metal oxide semiconductors do not have room temperatur...

Claims

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Application Information

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IPC IPC(8): G01N33/00
CPCG01N33/0004
Inventor 马振壬宋鹏王琦杨中喜李卓起
Owner UNIV OF JINAN
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