Abstract
SnO2 film is widely used in the field of coated glass for its excellent transmittance and conductivity of visible light, and its application prospect is very promising. Graphene, as a monolayer of graphite molecules, has many unique properties. With the introduction of graphene in SnO2 film, higher carrier concentration can be produced, and thus a better transparent conductive film can be obtained. Based on the above ideas, graphene doped SnO2 composites were synthesized by hydrothermal method, and their gas sensitivity to three toxic substances, such as ethylamine and formaldehyde, were studied. The aim is to develop an excellent gas sensitive material. The introduction of graphene can significantly improve the gas sensing properties of SnO2 materials. Gas sensing properties of the composite to formaldehyde, acetaldehyde and other volatile organic compounds were better than pure SnO2. In the 120< test temperature, the graphene composite with doping amount of 0.6 wt.% exhibited the best sensing properties to formaldehyde.
