Structural rearrangement of bimetallic alloy PdAu nanoparticles within dendrimer templates to yield core/shell configuration

Marc R. Knecht, Michael G. Weir, Anatoly I. Frenkel, Richard M. Crooks

Research output: Contribution to journalArticle

133 Scopus citations

Abstract

Here we present evidence for an oxidation-driven structural conversion of quasi-alloy PdAu dendrimer-encapsulated nanoparticles (DENs) to a Au-core/Pd-shell configuration. The initial quasialloy was prepared by co-complexation of PdCl42- and AuCl4 - within a sixth-generation, poly(amidoamine) dendrimer template followed by chemical reduction. Exposure to air resulted in selective reoxidation of the Pd atoms and subsequent re-reduction led to deposition of a Pd-rich shell on the surface of the remaining Au core. The core/shell nanoparticles were extracted as monolayer-protected clusters (MPCs) from within the dendrimer templates using dodecanethiol. The resulting materials were characterized by UV-vis spectroscopy, transmission electron microscopy, and extended X-ray absorption fine structure (EXAFS) spectroscopy.

Original languageEnglish (US)
Pages (from-to)1019-1028
Number of pages10
JournalChemistry of Materials
Volume20
Issue number3
DOIs
StatePublished - Feb 12 2008
Externally publishedYes

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ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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