ゾル-ゲル法により作製した金粒子含有色素増感TiO<sub>2</sub>膜の光電気化学的性質

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  • Photoelectrochemical Properties of Dye-Sensitized TiO<sub>2</sub> Films Containing Dispersed Gold Metal Particles Prepared by Sol-Gel Method
  • Photoelectrochemical Properties of Dye

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Effects of gold nanoparticle incorporation on the photoanodic properties were studied for fluorescein-, rose bengal- and nile blue A-deposited TiO2 film electrodes prepared by the sol-gel method. The incorporation of gold particles decreased the dye-induced photoresponse in the visible region, which was ascribed to the retarded electron transport in the conduction band due to the Schottky barriers at titania/gold interfaces. The extent of decrease in photoresponse, however, was the smallest for the electrode sample with rose bengal, whose optical absorption well overlapped the surface plasma resonance of the gold particles. The dipole-dipole coupling between rose bengal molecules and gold particles was thought to enhance the photochemical processes, resulting in smaller reduction in the photoresponse.

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