Tungsten oxide powder, which is an inorganic electrochromic material, may be applied for preparing thermal insulation paper. In recent years, that the nanotechnology improves the discoloration performance through structural adjustment has become increasingly mature. And this technology has led to the study of tungsten oxide being redirected to the crystalline structure that has more compact and stable structure while its discoloration performance relatively poor. This makes it possible to prepare crystalline tungsten oxide with high rate of discoloration while ensuring chemical stability and cycle durability.
But inorganic electrochromic materials such as tungsten oxide are generally inferior to organic electrochromic materials in terms of color change response time. So in the early decades, amorphous tungsten oxide was often used with concern because of its relatively high rate of discoloration. While the chemical and structural stability of the amorphous tungsten oxide is relatively poor, and it is prone to irreversible changes, resulting in a decrease in cycle life. This defect has once again become a new research bottleneck.
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