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Facile synthesis of Pd concave nanocubes: From kinetics to mechanistic understanding and rationally designed protocol

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Abstract

We report a rationally designed one-pot method for the facile synthesis of Pd concave nanocubes in an aqueous solution at room temperature by manipulating the reduction kinetics through the selection of a proper combination of a salt precursor (PdBr42–) and reductant (sodium ascorbate). Our kinetic analysis demonstrates that, through this selection, the nucleation and growth of Pd nanocrystals could be effectively separated into two kinetic regimes involving distinctive reduction pathways: i) solution reduction for the initial formation of single-crystal seeds and ii) surface reduction for the formation of concave nanocrystals via autocatalytic growth from the single-crystal seeds. The suppressed surface diffusion at room temperature, when coupled with the capping effect of bromide ions, ultimately leads to the formation of concave nanocubes with an asymmetric shape and high-index facets, whose synthesis would otherwise require multiple steps and the use of elevated temperatures.

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Acknowledgements

This work was supported in part by a grant from the National Science Foundation (No. DMR-1506018) and startup funds from Georgia Tech. The electron microscopy studies were performed at the Georgia Tech’s Institute for Electronics and Nanotechnology, a member of the National Nanotechnology Coordinated Infrastructure, which is supported by the National Science Foundation (No. ECCS-1542174).

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Authors and Affiliations

  1. School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA, 30132, USA

    Madeline Vara & Younan Xia

  2. The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, GA, 30132, USA

    Younan Xia

Authors
  1. Madeline Vara
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  2. Younan Xia
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Correspondence to Younan Xia.

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Vara, M., Xia, Y. Facile synthesis of Pd concave nanocubes: From kinetics to mechanistic understanding and rationally designed protocol. Nano Res. 11, 3122–3131 (2018). https://doi.org/10.1007/s12274-018-1967-2

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  • DOI: https://doi.org/10.1007/s12274-018-1967-2

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