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

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 ...