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Fabrication of Silica Nanocapsules Containing Ag/Au Alloy Nanoparticles by Galvanic Replacement Reaction

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Abstract:

A straightforward method has been developed to generate silica nanocapsules containing Ag/Au alloy nanoparticles (Ag/Au@silica) by in-situ galvanic replacement reaction between the silicacoated silver (Ag@silica) nanoparticles with aqueous chloroauric acid (HAuCl4). Ag/Au@silica exhibits an optical absorbance derived from the surface Plasmon resonance of the encapsulated Ag/Au alloy nanoparticle. The behaviour of chemical diffusion across the silica shells of Ag/Au@silica is also investigated. It is worthy to noting that this facile synthetic strategy could be amenable to the other systems that involve the use of different combination of materials for the core (Pd/Ag, Pt/Ag alloy nanoparticles) and for the shell (titania).

Keywords: AG/AU ALLOY; CHEMICAL DIFFUSION; GALVANIC REPLACEMENT REACTION; NANOPARTICLES; SILICA NANOCAPSULES

Document Type: Research Article

DOI: https://doi.org/10.1166/jnn.2010.2979

Publication date: 2010-10-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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