Photoreactive titanium oxide layer prepared from a titanium naphthenate

Highly transparent titanium oxide thin films were prepared on soda-lime–silica slide glass substrates from a titanium naphthenate precursor. Films prefired at 500 °C for 10 min were finally heat treated at 500 °C for 30 min in air. Crystallinity of the films was analyzed by high resolution X-ray diffraction analysis. A sharp absorption edge of the TiO 2 film was observed. The estimated energy band gap for the film is larger than that of single crystal TiO 2.