Graphene quantum dot-ZnO composite gas-sensitive material with high sensitivity to acetic acid gas

Abstract

The invention discloses a graphene quantum dot-ZnO composite gas-sensitive material with high sensitivity to acetic acid gas and belongs to the technical field of gas-sensitive materials. The gas-sensitive material is prepared from ZnO and graphene quantum dots, wherein the mass of the graphene quantum dots accounts for 10% to 20% the total mass of the gas-sensitive material. A heater type gas sensor made by using the material as a sensitive material has the sensitivity (the ratio of element resistance in air to element resistance in detected gas) of 2 to 2.6 to 0.01ppm acetic acid at the working temperature of 300 DEG C and the sensitivity of 590 to 620 to 1,000ppm acetic acid, has the average response recovery time shorter than 45 seconds and can achieve rapid detection on concentration of the acetic acid in the air.

Description

technical field

[0001] The invention belongs to the technical field of gas-sensing materials, in particular to a graphene quantum dot-ZnO composite gas-sensing material with high sensitivity to acetic acid gas. The gas sensor made of the gas sensitive material has high sensitivity and good selectivity to low concentration acetic acid in the air. technical background

[0002] Acetic acid is a volatile, colorless liquid with a strong pungent smell. It is highly corrosive and can cause skin and mucous membranes to blister, redness, and swelling. When the concentration is high, it can cause rhinitis and bronchitis. In severe cases, acute chemical reactions may occur. pneumonia. At present, acetic acid is widely used in chemical enterprises, and more and more enterprises are involved in monitoring the concentration of acetic acid in environmental impact assessment and acceptance monitoring. The health standard of the United States, Japan and other countries is 25mg / m 3 (about ...