Nano tungsten trioxide is suitable for preparing glass curtain wall heat insulating coating. The prepared coating is transparent and environmentally friendly with good electrochromic properties. So, it is believed that nano tungsten trioxide coating is promising in production of smart windows.
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According to the experts, the amorphous tungsten oxide layers can be deposited via the sol-gel route. Aqueous solutions of tungstate salts (Na2WO4) provide cheap and suitable precursors for the synthesis of WO3·nH2O colloidal solutions. Layers of large area can be deposited by spray or dip-coating. They exhibit electrochromic properties and could be used for making smart windows. Their electrochromic properties depend on the structure of the oxide network and the amount of water of the WO3·nH2O layers. Switching time and stability decrease when n increases due to faster ion diffusion. Optical absorption arising from electron delocalization varies with the crystalline structure of the oxide network. Both the structure and the hydration state of the layers depend on the experimental procedure. Therefore, it is possible to optimize the electrochromic properties of sol-gel derived glass curtain wall heat insulating coating layers of nano tungsten trioxide.
