凯发

Graphene is a fascinating material for gas sensing due to its large specific surface area for molecular adsorption and outstanding electrical properties such as low noise level and high carrier mobility. In addition, the oxygen functional groups(C-OH, COOH, C-O-C, C=O) on the surface of GO act as active sites for interaction with gaseous molecules. The type of oxygen functional groups influence on selectivity of gas sensors. In this paper, we studied the influence of gas sensing of graphene oxide with different oxidation degree, reduction degree and thin film thickness. Results showed that with the relative humidity increased from 11.3~93.6%RH, the resistance of the samples were significantly reduced. The response time and recovery time of the humidity sensors were both about 3 s, and the sensitivity approached 99%RH, suggesting the samples were of a good humidity sensing at the room temperature.