关键词: WO₃纳米晶, 贵金属纳米晶簇, 气敏性能, 气敏机理, 光催化性能, 光催化机理

Abstract: WO₃-based composite nanostructures have been used as the promising materials for gas-sensing and photocatalytic applications. The performance of WO₃ composite nanostructures modified by noble metals can be greatly improved compared to individual WO₃ material. In this paper，the recent progress in the gas-sensing and photocatalytic properties of noble-metal-modified WO₃ composite nanostructures is reviewed. Effects of preparation methods and noble metal dopants on the gas-sensing properties to various gases，such as NO_x，H₂S，H₂ and etc.，have been discussed in detail. The gas sensing mechanisms of noble-metal-modified WO₃ composite nanostructures have been introduced. The photocatalytic properties of noble-metal-modified WO₃ composite nanostructures are reviewed according to the species of noble metals（such as Au，Ag，Pt and Pd nanoclusters）. The recent achievements in improving the photocatalytic performance of noble-metal-modified WO₃ composite nanocatalysts and the related photocatalytic mechanisms have been summarized. Some existing issues and future trends in development of the noble-metal-modified WO₃ compositephotocatalysts have been also included.

Key words: WO₃ nanocrystals, noble metal nanoclusters, gas-sensing properties, gas-sensing mechanism, photocatalytic properties, photocatalytic mechanism