Abstract
The visible light sensitive TiO 2 thin film photocatalysts can be developed by the application of ion beam techniques, i.e. the combination of an ion-assisted deposition (IAD) method and a metal ion-implantation. The transparent TiO 2 thin film photocatalysts have been prepared on silica glass plate by the IAD method. Then the transition metal ions (V +) were implanted into the TiO 2 thin films at high energy acceleration using a metal ion-implantation technique to improve the electronic properties of the TiO 2 thin film to be able to work effectively as photocatalysts under visible light ( λ>450 nm) and/or solar light irradiation. The investigation using X-ray absorption fine structure analysis and ab initio molecular calculation suggest that the substitution of octahedrally coordinated Ti ions in TiO 2 lattice with implanted metal ions (V +) is important to modify TiO 2 to be able to adsorb visible light and operate under visible light irradiation.
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