Fabrication of optically tunable silica nanocapsules containing Ag/Au nanostructures by confined galvanic replacement reaction
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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.
KeywordsAlloys Galvanic replacement reaction Gold/Silver Nanostructures Silica Silver Sol–gel materials Nanomanufacturing
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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