Facile Synthesis of Tadpole-like Nanostructures Consisting of Au Heads and Pd Tails

J. Am. Chem. Soc., 129 (50), 15452 -15453, 2007. 10.1021/ja077505a S0002-7863(07)07505-1
Web Release Date: November 21, 2007

Facile Synthesis of Tadpole-like Nanostructures Consisting of Au Heads and Pd Tails

Pedro H. C. Camargo, Yujie Xiong, Li Ji, Jian M. Zuo, and Younan Xia*

Department of Chemistry, University of Washington, Seattle, Washington 98195-1700, and Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801

xia@biomed.wustl.edu

Received September 28, 2007

Abstract:

This communication describes an investigation of the galvanic replacement reaction between single-crystal Pd nanorods and AuCl₄^- ions. We found that the Au atoms resulting from the galvanic replacement reaction did not coat the entire surface of a Pd nanorod to generate a core-sheath or hollow nanostructure. In the earlier stages of the reaction, Au deposition was localized to both ends of the Pd nanorod. Then, a transition from two-end to one-end growth was observed, producing a new type of hybrid nanostructure in the shape of a tadpole consisting of a Au head and a Pd tail. Beyond this point, the Au served as nucleation sites for further Au deposition until the hybrid nanostructure was dismantled into round Au nanoparticles and smaller/shorter Pd fragments.

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