Nano tungsten trioxide has unique optical properties so that it can be applied to infrared thermal insulation nano material. And the optical properties of WO3 depend on grain size, morphology and special structure of tungsten trioxide nanomaterial to a large extent.
Nano WO3, as an n-type semiconductor material, has a broad application prospect in the field of information display devices, highly sensitive optical memory materials and the like. In addition, the research on the photochromic properties of tungsten trioxide is focused on sol and thin film currently. And there have been studies on “smart window”, which can control solar input of building. However, less attention has been paid so far to the photochromic properties of WO3 powders. In the very little studies of photochromic tungsten trioxide powders, the requirements for the excitation light source (350W high-pressure mercury lamps) have been restricted harshly on yet. Therefore, the synthesis of tungsten trioxide powder material with special morphology and excellent photochromic properties has become one of the hot spots in current research.
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