Abstract
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 Letters
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