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1 November 1990 Electrochromic properties of sol-gel derived WO3 coatings
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Amorphous tungsten oxide layers are deposited via the sol-gel route. Aqueous solutions of tungstate salts (Na2WO4) or chioroalkoxides (WOC12(OPr')2) provide cheap and suitable precursors for the synthesis of W03, 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 display devices or smart windows. Their elecirochromic properties depend on the structure of the oxide network and the amount of water of the W03, 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. It is therefore possible to optimize the electrochromic properties of sol-gel derived layers.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Patrick Judeinstein and Jacques Livage "Electrochromic properties of sol-gel derived WO3 coatings", Proc. SPIE 1328, Sol-Gel Optics, (1 November 1990);


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