The Research on WO3 Nano-Materials' Gas-Sensing

As a N-type semiconductor,WO3 has excellent gas sensitivity to NOX、H2 S、H2 、CH4 、C2H5OH、CO and NH3 . At present,WO3 , as gas-sensing material , has almost sufficed for application of society, but some capabilities would still be improved . In this paper, the gas sensing mechanism has been introduced. The melioration of gas-sensing capability of the WO3 nano-materials whose shape was controlled and the WO3 doped and nano-composited has been summarized. Some opinion of the future research trend of WO3 was proposed. There is a great study space, such as increased sensitivity and lower operating temperatures, especially to improve the selectivity and stability. Preparation of WO3 nano-materials need to overcome the high cost, simple and repetitive exploration of the preparation process, so that earlier used in commercial production, production and living services for the community.