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Fabrication of optically tunable silica nanocapsules containing Ag/Au nanostructures by confined galvanic replacement reaction

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Abstract

Silica nanocapsules containing Ag/Au alloy nanostructures (SNCAs) are fabricated by galvanic replacement (GR) reactions between silver core nanoparticles within silica shells and aqueous HAuCl4 in a confined nano-space. The structure and morphology of the resulting SNCAs are diversified by controlling the relative amount of Ag/Au, exhibiting tunable optical absorptions in visible region. The GR reactions in a confined nano-space include alloying and de-alloying processes that determine the evolution of morphology and optical absorption of SNCAs.

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Silica nanocapsules containing Ag/Au alloy nanostructures with tunable optical properties are fabricated by confined galvanic replacement reactions between silver core nanoparticles with silica shells and aqueous HAuCl4 in a confined nano-space.

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Acknowledgments

This study was supported by grants-in-aid for the National Core Research Centre Program MOST/KOSEF (R15-2006-022-01001-0), Brain Korea 21 program (BK21), and the World Class University Program (No. R32-2008-000-10174-0).

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Authors and Affiliations

  1. The WCU Center for Synthetic Polymer Bioconjugate Hybrid Materials, Department of Polymer Science and Engineering, Pusan National University, Pusan, 609-735, Korea

    Haiqing Li, Chang-Sik Ha & Il Kim

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  1. Haiqing Li
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  2. Chang-Sik Ha
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  3. Il Kim
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Correspondence to Il Kim.

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Li, H., Ha, CS. & Kim, I. Fabrication of optically tunable silica nanocapsules containing Ag/Au nanostructures by confined galvanic replacement reaction. J Nanopart Res 12, 985–992 (2010). https://doi.org/10.1007/s11051-009-9650-x

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  • DOI: https://doi.org/10.1007/s11051-009-9650-x

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