Keggin ion-mediated synthesis of aqueous phase-pure Au@Pd and Au@Pt core-shell nanoparticles

Mandal, Saikat ; Mandale, Anandrao B. ; Sastry, Murali (2004) Keggin ion-mediated synthesis of aqueous phase-pure Au@Pd and Au@Pt core-shell nanoparticles Journal of Materials Chemistry, 14 (19). pp. 2868-2871. ISSN 0959-9428

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Official URL: http://pubs.rsc.org/en/content/articlelanding/2004...

Related URL: http://dx.doi.org/10.1039/B409033K

Abstract

Development of simple and reliable protocols for the synthesis of phase-pure core-shell metal nanoparticles is an important problem in nanomaterials synthesis; the synthesis of Au core-Pd/Pt shell nanoparticles is described in this paper. This is accomplished by utilizing Keggin ions bound to the surface of gold nanoparticles as UV-switchable reducing agents. Exposure of Keggin ion-capped gold nanoparticles to aqueous solutions of Pd2+ and Pt4+ ions after UV activation of the Keggin ions results in selective reduction of the metal ions only on the surface of the nanoparticles and thus, to phase-pure core-shell nanostructures. The synthesis of the Au@Pd and Au@Pt core-shell nanoparticles was followed by UV-vis spectroscopy, X-ray photoemission spectroscopy and high-resolution transmission electron microscopy measurements.

Item Type:Article
Source:Copyright of this article belongs to Royal Society of Chemistry.
ID Code:47200
Deposited On:07 Jul 2011 05:20
Last Modified:18 May 2016 02:57

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