Aqueous-Phase Synthesis of Single-Crystal Pd Seeds 3 nm in Diameter and Their Use for the Growth of Pd Nanocrystals with Different Shapes

Authors

  • Cun Zhu,

    1. The Wallace H. Coulter Department of Biomedical Engineering, School of Chemistry & Biochemistry and School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332 (USA), Fax: (+1) 404-385-3209
    2. State Key Laboratory of Bioelectronics, School of Chemistry and Chemical Engineering, Southeast University, Nanjing, Jiangsu 210096 (P.R. China)
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  • Prof. Jie Zeng,

    1. Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026 (P.R. China)
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  • Dr. Ping Lu,

    1. The Wallace H. Coulter Department of Biomedical Engineering, School of Chemistry & Biochemistry and School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332 (USA), Fax: (+1) 404-385-3209
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  • Prof. Jingyue Liu,

    1. Department of Physics, Arizona State University, Tempe, Arizona 85287 (USA)
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  • Prof. Zhongze Gu,

    1. State Key Laboratory of Bioelectronics, School of Chemistry and Chemical Engineering, Southeast University, Nanjing, Jiangsu 210096 (P.R. China)
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  • Prof. Younan Xia

    Corresponding author
    1. The Wallace H. Coulter Department of Biomedical Engineering, School of Chemistry & Biochemistry and School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332 (USA), Fax: (+1) 404-385-3209
    • The Wallace H. Coulter Department of Biomedical Engineering, School of Chemistry & Biochemistry and School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332 (USA), Fax: (+1) 404-385-3209
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Abstract

This article describes an aqueous method for the synthesis of Pd seeds with a single-crystal structure and a uniform diameter of 3 nm and their use for the growth of Pd nanocrystals with a variety of shapes. We have also investigated the effects of a number of parameters, including the temperature, reducing power of the reductant, and capping agent on the reduction rate of a Pd precursor, and thus the final size, size distribution, and morphology of the Pd seeds. By taking advantage of the coordination effect of Br ions with Pd2+ ions and their selective adsorption on the Pd(100) surface, Pd nanocrystals with a number of distinct shapes could be conveniently produced by varying the concentration of KBr added into the growth solution. This work provides a general and facile method for the green synthesis of Pd nanocrystals with controlled shapes, especially for the preparation of Pd nanocrystals with sizes in the sub-10 nm regime.

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