Tungsten Trioxide Nanopowder Applied for Smart Glass

Tungsten trioxide nanopowder may be prepared into a WO3 electrochromic film, and then be used to prepare an all-solid electrochromic glass - a smart glass, which is often applied in the field of building for achieving the performance of high thermal insulation, high heat preservation and high transparency. This is because nano particle size tungsten trioxide has excellent electrochromic properties as well as electrochemical stability. Therefore, WO3 has become one of the most studied electrochromic materials.

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The coloring-bleaching phenomenon of electrochromic glass is caused by the fact that the tungsten trioxide electrochromic film undergoes electrochromism under the action of an external electric field, and the other constituent films in the glass do not undergo color change. Although there is no uniform understanding of the electrochromic mechanism of the tungsten trioxide film currently. Generally, it is believed that the WO3 structure is converted into a tungsten bronze structure, causing the color of the film to change.

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