Tungsten oxide nanopowder, which may be applied for preparing window heat insulation film, has photochromic properties. This kind of heat insulation film of tungsten oxide is very thin with the characteristics of good heat insulation effect and high visible light transmittance. And it does not affect indoor lighting. Besides, it is anti-glare. Nano grain size tungsten oxide is an important semiconductor material that has broad application prospects in information storage, fuel cells and chemical sensors, etc.
Nano grain size tungsten oxide (with different oxygen content) that can be used in building glass includes WO3 (yellow tungsten oxide, YTO, tungsten oxide), WO2.9 (blue tungsten oxide, BTO), WO2.72 (violet tungsten oxide, VTO), and so on. Certainly, cesium tungsten bronze can also be used to produce this type of heat insulation film.
Since the temperature, calcination atmosphere and speed of the nano grain size tungsten oxide are strictly controlled in the production, the prepared tungsten oxide has a complete crystal form and a small particle size.
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