Porous tungsten trioxide electrochromic film can be prepared by sol-impregnation pulling method. In this regard, experts said that preparing tungsten oxide film by this method has the advantages of simple equipment and low film forming cost. Also, you can prepare an electrochromic thin film of large glass area, which is now the important research direction for smart buildings.
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Besides, the nanocrystalline WO3 film can also be prepared by sol-impregnation pulling. While the experts said that the porous WO3 film has a wider range of visible light adjustment and higher coloring efficiency than the nanocrystalline WO3 film. This is because the voids make it easier for ions to be inserted and extracted. Some experts used the sol-impregnation method to prepare WO3 film. When acetylated tungsten peroxide sol was added to 4% of the mass ratio of oxalic acid dihydrate, nanocrystalline WO3 film could be prepared. Porous WO3 film could be prepared without adding oxalic acid dihydrate.
