Semiconductor-metal nanocomposites have been widely employed in photo catalysis. In most of the catalytic studies, metal nanoparticles are dispersed on an oxide surface, such a catalyst structure, though effective; result in exposing both to reactants and the surrounding medium. Recently, some metal-core oxide-shell nano structures have been prepared successfully, and a considerable amount of the research has been performed on their crystal structures and morphologies. Yet, the applications such as the application in the photocatalysis have seldom been reported. In the present work, flowerlike Au/TiO2 core-shell nano composite particles were prepared by hydrothermal synthesis process and characterized by XRD, XPS, TEM, FE-SEM and BET measurement.The Au/TiO2 flowerlike core-shell nano composites showed drastic improvement in the photocatalytic activity comparing with the nano TiO2 particles. The authors explained in detail the reason that the flower-like structure plays an important role in the activity increase. In addition, the effects of the Au-core size on the photocatalytic activity were also studied. The higher photocatalytic activity was obtained in the composite catalyst with smaller Au-core size than that composed of larger Au particles.

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