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Photodeposition of Pd onto Colloidal Au Nanorods by Surface Plasmon Excitation
Published on: August 15, 2019
Controlling Shape and Plasmon Resonance of Pt-Etched Au@Ag Nanorods
Rongkai Ye1, Yanping Zhang1, Yuyu Chen1
1Key Laboratory of Fuel Cell Technology of Guangdong Province, Department of Chemistry, College of Chemistry and Chemical Engineering , South China University of Technology , Guangzhou 510640 , China.
Abstract:
Pt-based catalysts with novel structure have attracted great attention due to their outstanding performance. In this work, H2PtCl6 was used as both precursor and etching agent to realize the shape-controlled synthesis of Pt-modified Au@Ag nanorods (NRs). During the synthesis, the as-prepared Ag shell played a crucial role in both protecting the Au NRs from being etched away by PtCl62- and leading to an unusual growth mode of Pt component. The site-specified etching and/or growth depended on the concentration of H2PtCl6, where high-yield core-shell structure or dumbbell-like structure could be obtained. The shape-controlled synthesis also led to a tunable longitudinal surface plasmon resonance from ca. 649 to 900 nm. Meanwhile, the core-shell Pt-modified Au@Ag NRs showed approximately 4-fold enhancement in catalytic reduction reaction of p-nitrophenol than that of the Au NRs, suggesting the great potential for photocatalytic reaction.
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