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Controlling Shape and Plasmon Resonance of Pt-Etched Au@Ag Nanorods

Ye, Rongkai, Zhang, Yanping, Chen, Yuyu, Tang, Liangfeng, Wang, Qiong, Wang, Qianyu, Li, Bishan, Zhou, Xuan, Liu, Jianyu, Hu, Jianqiang
Langmuir 2018 v.34 no.20 pp. 5719-5727
catalysts, nanogold, nanorods, p-nitrophenol, photocatalysis, platinum, silver, surface plasmon resonance
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.