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Synthesis of Gold Nanoshells and Their Use in Sensing Applications

Published online by Cambridge University Press:  15 February 2011

Yugang Sun  and
Younan Xia
Yugang Sun
Affiliation:
Department of Chemistry, University of Washington, Seattle, WA 98195-1700, U.S.A.
Younan Xia
Affiliation:
Department of Chemistry, University of Washington, Seattle, WA 98195-1700, U.S.A.
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Abstract

A general approach involved template-engaged, galvanic replacement reactions has been developed to prepare metallic nanostructures with hollow interiors by reacting solutions of appropriate salts with metallic solid nanoparticles. The reaction between aqueous chloroauric acid and silver nanoparticles was used as a typical example to demonstrate the synthesis of gold nanoshells. The morphology, void space, and wall thickness of these hollow structures were all determined by the silver templates, which were completely converted into soluble species during the replacement reaction. The extinction peaks of these gold nanoshells were considerably redshifted as compared to solid gold colloids having approximately the same dimensions. In addition, the surface plasmon resonance of gold nanoshells exhibited a much more sensitive response toward environmental changes even when compared with solid colloids with a mean size much smaller than that of gold nanoshells.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 776: Symposium Q – Unconventional Approaches to Nanostructures with Applications in Electronics, Photonics, Information Storage and Sensing , 2003 , Q2.7
Copyright
Copyright © Materials Research Society 2003

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