Fabrication of AgAu alloy-TiO₂ core-shell nanoparticles and their photocatalytic properties

Abstract

In this paper, for improving the photocatalytic efficiency of titania (TiO₂) nanoparticles (NPs), AgAu alloy-TiO₂ core-shell NPs are fabricated via a sol-gel (SG) process in the presence of AgAu alloy NPs with block copolymer shells as templates. The photocatalytic activities of the AgAu-TiO₂ NPs on the photodecomposition of methylene blue (MB) are investigated. The AgAu-TiO₂ composite NPs coated with 5.0% titania related to block copolymers show higher photocatalytic activity than the other samples in which the titania contents are larger than 5.0%. The results indicate that the increase of the thickness of the TiO₂ shell leads to the decrease of the photocatalytic activity.

Keywords

Methylene Blue / Block Copolymer / Methylene Blue / High Photocatalytic Activity / Galvanic Replacement Reaction

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This work has been supported by the National Natural Science Foundation of China (Nos.51173069 and 51473068).