WO3 is a relatively important photochromic material, but its color change efficiency is not very satisfactory. Therefore, experts use various methods to improve the color change efficiency of tungsten trioxide nanoparticles.
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For example, some experts have used gold nanoparticles to modify the tungsten trioxide film and found that its color change efficiency is nearly doubled. Some experts also used TiO2 to compound with WO3 sol and found that its color change efficiency was improved by nearly 40 times. However, despite this, the color change efficiency of tungsten trioxide nanopowder still needs to be improved. Thus, in recent years, the preparation of metastable tungsten oxide materials for ultrafine tungsten oxide powders, especially pyrochlore and tungsten bronze phases, has attracted extensive attention. Among them, the medium-low temperature hydrothermal synthesis method is a better method for preparing metastable oxide nanomaterials, but its synthesis conditions are limited in scope, which is not conducive to industrial synthesis.
