Journal of Nanoparticle Research

, Volume 12, Issue 3, pp 985–992 | Cite as

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

  • Haiqing Li
  • Chang-Sik Ha
  • Il Kim
Research Paper


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.

Graphical abstract

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.


Alloys 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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Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  1. 1.The WCU Center for Synthetic Polymer Bioconjugate Hybrid Materials, Department of Polymer Science and EngineeringPusan National UniversityPusanKorea

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