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Preparation method of thickness controllable WO3 nano sheet for trimethylamine gas sensor

A gas sensor, nanosheet technology, applied in the fields of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, to achieve the effect of a simple preparation process

Active Publication Date: 2018-09-04
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, WO 3 Nanosheets as a coating material for gas sensors for detecting TEA gas at room temperature have not been reported

Method used

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  • Preparation method of thickness controllable WO3 nano sheet for trimethylamine gas sensor
  • Preparation method of thickness controllable WO3 nano sheet for trimethylamine gas sensor
  • Preparation method of thickness controllable WO3 nano sheet for trimethylamine gas sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1#WO 3 The specific preparation steps of nanosheets are as follows:

[0031] At the initial reaction temperature of 25°C, dissolve 250mg of sodium oleate and 20mg of sodium octanoate into 75mL of nitric acid with a concentration of 4.8mol / L, and add 2mL of sodium tungstate solution with a concentration of 0.1mol / L dropwise under stirring conditions , stirred for 30 minutes, raised the temperature to 60°C, stirred for 2 hours, collected the precipitate, washed and dried to obtain WO 3 Nanosheets.

Embodiment 2

[0033] 2#WO 3 The specific preparation steps of nanosheets are as follows:

[0034] At the initial reaction temperature of 25°C, dissolve 250mg of sodium oleate and 150mg of sodium octanoate into 75mL of nitric acid with a concentration of 4.8mol / L, and add 0.5mL of sodium tungstate with a concentration of 0.1mol / L dropwise under stirring. solution, stirred for 30min, heated to 60°C, stirred for 2 hours, collected the precipitate, washed and dried to obtain WO 3 Nanosheets.

Embodiment 3

[0036] 3#WO 3 The specific preparation steps of nanosheets are as follows:

[0037] At the initial reaction temperature of 10°C, dissolve 250 mg of sodium oleate and 150 mg of sodium octanoate into 75 mL of nitric acid with a concentration of 4.8 mol / L, and add 0.5 mL of sodium tungstate with a concentration of 0.1 mol / L dropwise under stirring. solution, stirred for 30min, heated to 60°C, stirred for 2 hours, collected the precipitate, washed and dried to obtain WO 3 Nanosheets.

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Abstract

The invention discloses a preparation method of a thickness controllable WO3 nano sheet for a trimethylamine gas sensor, and belongs to the field of gas sensors. The thickness of the WO3 nano sheet can be regulated from about 10 nm to about 5nm. According to the invention, a method of adopting dual surfactants is carried out, and the thickness of the WO3 nano sheet can be controlled through the regulation of preparation conditions such as the initial reaction temperature, the usage amounts of sodium oleate and sodium caprylate, the concentration and usage amount of nitric acid and sodium tungstate, the temperature preservation time, the stirring time and the like. The thickness controllable WO3 nano sheet prepared by the method is used as a coating material of a gas sensor and achieves a good effect in detecting trimethylamine. When the thickness of the nano sheet is 5 nm, the response to trimethylamine (TEA) is good at a temperature of 25 DEG C, and when the TEA content is 250 ppm, the response value is 8.2, and the selectivity is good.

Description

technical field [0001] The invention belongs to the field of gas sensors, in particular to a coating material for trimethylamine (TEA) gas sensors - - - - WO 3 Preparation technology of nanosheets, especially a kind of WO with controllable thickness 3 Preparation techniques of nanosheets. Background technique [0002] A gas sensor is a device or device that can detect gas components and concentrations and convert them into electrical signals. With the development of industrial and agricultural production technology, timely and accurate detection and monitoring of flammable, explosive, toxic and harmful gases has become an important issue to be solved urgently in the coal, petroleum, chemical, electric power and other departments. At the same time, with the improvement of people's living standards, the pursuit of high quality of life has become a trend, and it is also urgent to develop a variety of high-sensitivity, ultra-small, multi-functional gas sensors, such as CH 4 ,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/02B82Y30/00G01N33/00
CPCB82Y30/00C01G41/02C01P2002/01C01P2002/72C01P2002/80C01P2004/64G01N33/0047
Inventor 陈国昌储向峰乔红斌叶明富
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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