Tungsten trioxide films have been shown to have applications as the sensing element in gas sensors. One of the most important part of the gas sensor is gas sensitive element. The sensor's sensitivity, selectivity, to a large extent dependent, depends on the performance of gas sensitive element. The general gas sensor is thin film material. Study on tungsten trioxide films began 20 years ago, most is on the electrically induced discoloration, photochromic, electrochemistry and gas sensor performance. For hydrogen sensor, tungsten trioxide films have enormous potential. When tungsten trioxide contacts with hydrogen, the most change is the film colour from transparent to blue. At the same time, changes have taken place in film measured by optical instruments. So tungsten trioxide films are good hydrogen sensitive materials. After doping of rare metal, such as platinum and palladium, hydrogen sensitive properties of tungsten trioxide films can greatly improve. Tungsten trioxide films not only can be used for hydrogen sensor, after doping different elements in different conditions, can also be used for other gases sensitive materials, such as NH4, NO2, H2S, O3 and O2.

Tungsten trioxide films material is a kind of wide application of functional materials, has the very broad application prospects. This material can be used in electrically induced discoloration electrochromics, smart Windows, etc. In different field of application of the film materials have different requirements.

 

 

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