Electrochromic properties of V2O5-TiO2 thin films prepared by a spin-coating method were strongly dependent on the film compositions and heat-treatment temperatures. It was found that the nearly amorphous film of V2O5-TiO2 (3:7 in molar ratio) heat-treated at 400 °C showed coloration to reddish brown when polarized at −0.8 V vs SCE. This new coloration was concluded to be ascribable to amorphous vanadium oxide.
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Nagase et al. (1992) studied this question.
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