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Tungsten oxide composite gas sensitive material used for detecting low concentration acetone gas

A gas-sensitive material, tungsten oxide technology, which is applied in the analysis of materials, material resistance, nitrogen compounds, etc., can solve the problems of expensive, time-consuming, poor selectivity of acetone, etc., to improve the sensitivity and selectivity of gas sensitivity , the effect of reducing sensitivity

Active Publication Date: 2018-11-30
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the method for determining the concentration of acetone in the air mainly uses gas chromatography, which requires relatively expensive instruments and equipment, and takes a long time for sampling and analysis
[0003] Tungsten oxide material can be used as a sensitive material for detecting acetone gas, but pure WO 3 The sensitivity of components made of materials to 1000ppm acetone and formaldehyde at 310°C is 4.5 and 9.0 respectively, and its selectivity to acetone is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh out 0.0023 g of C 3 N 4 In 20ml of deionized water, sonicate for 1 hour to obtain C 3 N 4 Suspension, again weighing 0.3298 g Na 2 WO 4 2H 2 O, add to C with stirring 3 N 4 Suspension, fully stirred for 30 minutes, sonicated for 30 minutes, then slowly added dropwise 1mol / L HCl solution to the suspension to adjust the pH of the mixed solution to 1.0, then added deionized water until the volume of the mixture was 70ml, and the reaction solution Move it to a 100ml hydrothermal reaction kettle and react at 200°C for 24 hours. The precipitate obtained is washed three times with absolute ethanol, and the product is baked at 80°C for 24 hours. Composite materials containing 1% C 3 N 4 .

[0021] The material is made into a side-heated element, and the highest sensitivity of the element to 0.1, 1, 10, 100, 1000ppm acetone gas at 310°C is measured to be 1.2, 4.4, 12.2, 33.1, 61.2, respectively. The response time and recovery time for 0.1-1000pp acetone are not ...

Embodiment 2

[0023] Weigh out 0.0046 g of C 3 N 4 In 20ml of deionized water, sonicate for 1 hour to obtain C 3 N 4 Suspension, again weighing 0.3298 g Na 2 WO 4 2H 2 O, add to C with stirring 3 N 4 Suspension, fully stirred for 30 minutes, sonicated for 30 minutes, then slowly added dropwise 1mol / L HCl solution to the suspension to adjust the pH of the mixed solution to 1.0, then added deionized water until the volume of the mixture was 70ml, and the reaction solution Move it to a 100ml hydrothermal reaction kettle and react at 200°C for 24 hours. The precipitate obtained is washed three times with absolute ethanol, and the product is baked at 80°C for 24 hours. Composite materials containing 2% C 3 N 4 .

[0024] The material is made into a side-heated element, and the highest sensitivity of the element to 0.1, 1, 10, 100, 1000ppm acetone gas at a working temperature of 310°C is measured to be 1.4, 6.4, 17.4, 36.1, 83.0, respectively. The response time and recovery time for 0....

Embodiment 3

[0026] Weigh out 0.0092 g of C 3 N 4 In 20ml of deionized water, sonicate for 1 hour to obtain C 3 N 4 Suspension, again weighing 0.3298 g Na 2 WO 4 2H 2 O, add to C with stirring 3 N 4 Suspension, fully stirred for 30 minutes, sonicated for 30 minutes, then slowly added dropwise 1mol / L HCl solution to the suspension to adjust the pH of the mixed solution to 1.0, then added deionized water until the volume of the mixture was 70ml, and the reaction solution Move it to a 100ml hydrothermal reaction kettle and react at 200°C for 24 hours. The precipitate obtained is washed three times with absolute ethanol, and the product is baked at 80°C for 24 hours. Composite materials containing 4% C 3 N 4 .

[0027] The material is made into a side-heating element, and the highest sensitivity of the element to 0.1, 1, 10, 100, 1000ppm acetone gas at a working temperature of 310°C is measured to be 1.6, 5.9, 14.9, 33.8, 74.2, respectively. The response time and recovery time for 0...

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Abstract

The invention discloses a tungsten oxide composite gas sensitive material used for detecting low concentration acetone gas, and belongs to the field of gas sensitive material. The tungsten oxide composite gas sensitive material used for detecting low concentration acetone gas is composed of WO3 and C3N4; the mass amount of C3N4 accounts for 1 to 5% of the total material mass; C3N4 in the tungstenoxide composite gas sensitive material is capable of increasing the sensitivity of tungsten oxide on acetone gas, reducing sensitivity of tungsten oxide on interface gas such as formaldehyde, and improving the gas sensitivity of the tungsten oxide composite gas sensitive material on acetone. A side-heating gas-sensitive element is prepared from the tungsten oxide composite gas sensitive material,at a working temperature of 310 DEG C, the sensitivity of the element on 1000ppm acetone ranges from 61 to 83, the sensitivity on 0.1ppm acetone gas ranges from 1.2 to 1.6, the response time and the recovery time on 0.1 to 1000ppm acetone gas are shorter than 60s, and the response time on 0.1ppm acetone is shorter than 10s. At a same working temperature, the sensitivity of the side-heating gas-sensitive element on 1000ppm formaldehyde is lower than 7, so that it is confirmed that the side-heating gas-sensitive element is high in gas sensitivity on acetone.

Description

technical field [0001] The invention belongs to the field of gas-sensitive materials, and in particular relates to a tungsten oxide composite material for detecting low-concentration acetone gas. The material is used to make gas-sensitive elements of gas sensors, and the gas sensor made has high sensitivity and high sensitivity to low-concentration acetone in the air. High selectivity. technical background [0002] Acetone is a colorless transparent liquid with a special pungent smell. In the industry, it is mainly used as a solvent in explosives, plastics, rubber, fiber, leather, oil, paint and other industries. It can also be used to synthesize ketene, acetic anhydride, iodoform, polyisoprene rubber, and methyl methacrylate. It is an important raw material for substances such as esters, chloroform, and epoxy resins. Acetone has inhibitory and anesthetic effects on the central nervous system, and exposure to high concentrations may cause liver, kidney and pancreas damage ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12C01B21/082
CPCC01B21/0605G01N27/125
Inventor 储向峰白林山董永平刘俊松
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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