Electrochemical and Optical Properties of WO3 Prepared by Sol-Gel Coating
Electrochromic WO3 thin film was prepared by using tungsten metal solution in hydrogen peroxide as a starting solution and by a sol-gel dip coating method. The thermal analysis was conducted by DSC/TG method. A DSC/TG analysis and the XRD patterns showed that a tungsten oxide crystal phase was formed at 400oC. WO3 thin film when heat-treated at 300oC was amorphous and had a better electrochemical property than that of the crystalline phase. Crystallization of tungsten oxide decreased active sites of ion intercalation so that the current density decreased with heat-treatment temperature.
Hyungsun Kim, Junichi Hojo and Soo Wohn Lee
C. Y. Kim et al., "Electrochemical and Optical Properties of WO3 Prepared by Sol-Gel Coating", Materials Science Forum, Vols. 544-545, pp. 1081-1084, 2007