Keggin ions as UV-switchable reducing agents in the synthesis of Au core-Ag shell nanoparticles

Saikat Mandal, P. R. Selvakannan, Renu Pasricha, Murali Sastry

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231 Citations (Scopus)


Keggin ion-mediated synthesis of Au core-Ag shell bimetallic nanoparticles is described. Exposure of photochemically reduced aqueous (PW12O40)3- Keggin ions to AuCl4- ions leads to the formation of stable gold nanoparticles capped by the Keggin ions. The surface-bound Keggin ions may then be activated by UV irradiation and, upon exposure to Ag+ ions, reduce the metal ions to form a silver shell around the gold core. That the capping agent not only stabilizes the metal nanoparticles but also plays the role of a switchable reducing agent is a highlight of this approach with important implications in nanomaterials synthesis and catalysis.

Original languageEnglish
Pages (from-to)8440-8441
Number of pages2
JournalJournal of the American Chemical Society
Issue number28
Publication statusPublished - 16 Jul 2003
Externally publishedYes

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