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

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

Research output: Contribution to journalArticle

127 Citations (Scopus)

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
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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Dendrimers
Nanoparticles
Extended X ray absorption fine structure spectroscopy
Ultraviolet spectroscopy
Complexation
Monolayers
Transmission electron microscopy
Atoms
Oxidation
Air

ASJC Scopus subject areas

  • Materials Chemistry
  • Materials Science(all)

Cite this

Structural rearrangement of bimetallic alloy PdAu nanoparticles within dendrimer templates to yield core/shell configuration. / Knecht, Marc; Weir, Michael G.; Frenkel, Anatoly I.; Crooks, Richard M.

In: Chemistry of Materials, Vol. 20, No. 3, 12.02.2008, p. 1019-1028.

Research output: Contribution to journalArticle

Knecht, Marc ; Weir, Michael G. ; Frenkel, Anatoly I. ; Crooks, Richard M. / Structural rearrangement of bimetallic alloy PdAu nanoparticles within dendrimer templates to yield core/shell configuration. In: Chemistry of Materials. 2008 ; Vol. 20, No. 3. pp. 1019-1028.
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