Highly nitrogen-substituted TiO2 (N-TiO2) thin film photocatalysts were prepared by aradio-frequency magnetron sputtering (RF-MS) deposition method. N-TiO2 thin films with lownitrogen concentration (0.5%) exhibited a small absorption band as a shoulder in the 400-500 nmwavelength region, indicating that isolated N 2p orbitals are formed above the O 2p orbitals.However, N-TiO2 with higher nitrogen concentration (6%) exhibited a sharp absorption edge at 500nm, indicating that visible light absorption is due to a band gap transition. These N-TiO2 thin filmscould operate as photocatalysts to decompose 2-propanol diluted in water under visible light. Theband structure of N-TiO2 was also determined by photoelectrochemical measurements and H2 and O2evolution was carried out from an aqueous solution involving sacrificial reagents.
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