Preparation of Various Laminated TiO₂ Films Acting Under Visible Light Irradiation by Sol-Gel Processing and Their Photocatalytic Properties

Abstract

Laminated TiO₂/Fe₂O₃/ITO and TiO₂/Fe₂O₃/glass films acting under visible light irradiation were prepared by sol-gel processing as well as TiO₂/V₂O₅/ITO or TiO₂/WO₃/ITO films. Under Xenon lamp irradiation, the rate of bleaching of Methylene Blue (M.B.) on TiO₂/Fe₂O₃/ITO or TiO₂/WO₃/ITO was found to become greater than that of the original TiO₂/glass which was the best under black light irradiation. The TiO₂/Fe₂O₃/glass, whose Fe₂O₃ was confirmed to be formed as α-hematite by using Mossbauer measurement, seems to be applicable because of its photocatalytic ability.