Photocatalytic TiO<sub>2</sub> thin film is prepared by sol-gel technique on microstructured silicon substrate produced by femtosecond laser cumulative irradiation. The photocatalytic activity is evaluated by the degradation of methylene blue (MB) solution under ultraviolet (UV) irradiation. For 6-ml MB solution with initial concentration of 3.0 × 10<sup>-5</sup> mol/L, the degradation rate caused by TiO<sub>2</sub> thin film of 2-cm<sup>2</sup> area is higher than 70% after 10-h UV irradiation. Microstructured silicon substrate is found to enhance photocatalytic activity of the TiO<sub>2</sub> thin film remarkably. The femtosecond laser microstructured silicon substrate is suitable to support TiO<sub>2</sub> thin film photocatalysts.
© 2012 Chinese Optics LettersPDF Article