Gold (Au) nanoparticles supported on titania (TiO 2 ) and ceria have been applied to a visible-light-responding plasmonic photocatalyst and functionalization of Au/TiO 2 photocatalysts with cocatalysts were achieved by separate loading of Au nanoparticles and cocatalyst nanoparticles without alloying and nanoparticle coagulation. Here we report effectiveness of another functionalization by formation of a core− shell structure in photocatalytic reaction induced by SPR of Au/TiO 2 . Newly functionalized core−shell gold−palladium particles supported on TiO 2 (Au@Pd/TiO 2 ) were successfully prepared by using a two-step photodeposition method, and Au@Pd/TiO 2 with a shell thickness of 1.0 nm quantitatively converted chlorobenzene and 2-propanol to benzene and acetone under irradiation of visible light. Thickness control of the Pd shell was very important for both a satisfactory cocatalyst effect and absorption due to SPR of Au nanoparticles. The results of this study provide useful information for design of functionalization of plasmonic photocatalysts by formation of a core−shell structure.

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