Ion-beam modification of TiO2 film to multilayered photocatalyst

We report a dry process to produce a multilayered TiO2 film which has the rutile phase on an anatase substrate, for highly activated photocatalysis. Ar ion beam irradiation changes the anatase surface into rutile at 500 deg. C, which is less than the crystallization temperature of rutile from anatase (600 deg. C). The ion beam modification makes it possible to form rutile thin film on anatase. The multilayered structure should be a promising photocatalyst, theoretically