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Phase-Transfer Identification of Core-Shell Structures in Bimetallic Nanoparticles

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Abstract

On the basis of a combination of previously published experimental procedures, ultraviolet–visible spectroscopy, transmission electron microscopy, and energy-dispersive X-ray measurements, a systematic investigation was carried out on the phase-transfer characteristics of different bimetallic nanoparticles (Ag–Au, Ag–Pt, Ag–Ru, Au–Pt, Au–Ru, and Pt–Ru) formed by the seed-mediated growth reactions. The different phase-transfer characteristics of the monometallic nanoparticles of Au, Ag, Pt, and Ru were used to form the basis of differentiation between various possible structures existing in the bimetallic systems (core-shell particles or a physical mixture of nanoparticles). The experimental results indicate clearly the formation of core-shell nanoparticles of Ag–Au, Ag–Pt, Ru–Ag, Pt–Au, Au–Ru, and Pt–Ru when the nanoparticles of the first metal were used as the seeds in the seed-mediated growth reactions. However, when the order of the synthesis was reversed using the nanoparticles of the second metal as the seeds, only a physical mixture of the two metal nanoparticles was obtained instead.

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Acknowledgements

The authors would like to acknowledge the general financial support from the Singapore-MIT Alliance. J.Y. would like to acknowledge the National University of Singapore for his research scholarship.

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Authors and Affiliations

  1. Department of Chemical and Biomolecular Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore, 119260, Singapore

    Jun Yang & Jim Yang Lee

  2. Singapore-MIT Alliance, 4 Engineering Drive 3, National University of Singapore, Singapore, 117576, Singapore

    Jim Yang Lee & Heng-Phon Too

  3. Department of Biochemistry, National University of Singapore, 10 Kent Ridge Crescent, Singapore, 119260, Singapore

    Heng-Phon Too

Authors
  1. Jun Yang
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  2. Jim Yang Lee
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  3. Heng-Phon Too
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Correspondence to Jim Yang Lee.

Additional information

Parts of the data on Au–Ru and Ag–Pt systems have been published in Analytica Chimica Acta (2005, 537, 279–284) and Journal of Physical Chemistry B (2005, 109, 5468–5472), respectively.

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Yang, J., Yang Lee, J. & Too, HP. Phase-Transfer Identification of Core-Shell Structures in Bimetallic Nanoparticles. Plasmonics 1, 67–78 (2006). https://doi.org/10.1007/s11468-005-9003-2

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