Nano crystalline tungsten oxide film is more and more widely applied in smart windows. And it is more and more common for people to know such an environmentally friendly heat insulation material. Therefore, it is imperative to prepare a WO3 electrochromic film with superior electrochromic properties in accordance with the needs of the times. So how to improve the electrochromic properties of the tungsten oxide electrochromic film?
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Experts say that from the material point of view, the electrochromic properties of tungsten oxide nano film is mainly related to the ion diffusion coefficient and diffusion pathway, so the electrochromic properties of such a film can be improved by controlling the structure and morphology of nano particle size tungsten oxide. For example, some experts have synthesized a tungsten oxide film with a nanocrystalline structure by a Langmuir Blodgett self-assembly method. The nano-particles of the film are closely arranged in an orderly manner like pebbles. At the same time, nano-scale pores are generated, which provide more active sites for Li-ion diffusion and shorten the diffusion path. And therefore it is more favorable for ion diffusion. The results show that the tungsten oxide film with nanocrystalline structure has very fast coloring and fading time as well as high coloring efficiency and good cycle stability.
