Advanced Materials

Direct observation of chemical reactions in silica-coated gold and silver nanoparticles

Authors

  • Dr. Paul Mulvaney,

    1. Advanced Mineral Products Research Center, School of Chemistry, University of Melbourne Parkville, Victoria 3052 (Australia)
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  • Dr. Michael Giersig,

    1. Advanced Mineral Products Research Center, School of Chemistry, University of Melbourne Parkville, Victoria 3052 (Australia)
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    • Hahn-Meitner Institut, Abt. Physikalische Chemie, Glienickerstr. 100, D-14109 Berlin, Germany

  • Thearith Ung,

    1. Advanced Mineral Products Research Center, School of Chemistry, University of Melbourne Parkville, Victoria 3052 (Australia)
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  • Dr. Luis M. Liz-Marzán

    1. Advanced Mineral Products Research Center, School of Chemistry, University of Melbourne Parkville, Victoria 3052 (Australia)
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    • Department of Physical and Organic Chemistry, Vigo University, Apdo. 874, E-36200 Vigo, Spain


  • The authors thank the Australian Research Council and the Advanced Mineral Products Research Center for support. The awards of a QEII Fellowship to P.M. and of an ARC International Research Fellowship to M.G. are also gratefully acknowledged.

Abstract

The direct observation of chemical reactions of single particles in real time has been achieved using silver nano-particles covered in a 10 nm silica shell (see cover). Transmission electron micrographs reveal how molecular iodine diffuses through the shell and reacts with Ag, giving AgI. A single AgI particle (mid-gray) is shown to form on the surface of the silica while the Ag core shrinks.

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