Development Status of Using Sol-Gel Method Produces Tungsten Oxide Films

Sol-gel method for manufacture tungsten trioxide films has a lot of advantages, such as it can be produce different crystal structure material, different degrees of dense material, and easy to control the product's composition and particle size. The most important it can produce large area and uniform films. Thanks to these advantages, it is used by mostly researchers to study and continue to develop. In 1999, researchers use sodium tungstate as reaction precursor and in the different PH value to produce WO3 films. Then with the increasing of PH value, tungsten oxide hydrate gradually change to octahedral 12- tungstate, and this is conducive to the low valence W atoms formation and photochromic pheromone occurs. After that researchers who prepared the same way, produced several hybrid multi-metal oxide film in which phosphorus tungsten oxide film after exposure to UV light in the visible and near infrared region to have a strong absorptive capacity. The method for the sol - gel method large tungsten trioxide film has taken an important step. By 2002, using tungsten hexachloride and tungsten acid as raw materials, by changing the alcohol, water and the proportion of PH value polyethylene glycol to obtain a stable sol, and made into a film. The hybrid films which are using WCL6 as raw material to produced and it has fast response, strong absorption advantages.

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