Tungsten trioxide may be tungsten trioxide particles with nano structure, and WO3 electrochromic film composed of WO3 nano particles serve as a smart window film for the automobile. Such smart film can play a role of heat insulation without affecting the line of sight of driving (the visible light transmittance is higher than 70%), and thereby saving energy and protecting environment. And it is also anti-glare and anti-peeping (one-way perspective).
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According to reports, at present, experts have prepared various nanostructured tungsten trioxide electrochromic films such as WO3 nanoclusters, WO3 nanowires, and WO3 nanosheets by hydrothermal method or templateless solvothermal method, and studied their electrochromic performance. Experts have found that all of these tungsten trioxide nano particles are not monodisperse grains of controlled size. In addition, experts have also said that there are not many studies on the effect of the size effect of nanomaterials on electrochromic properties, especially response time.
