Core shell inversion during nucleation and growth of bimetallic Pt/Ru nanoparticles

Michael S. Nashner, Anatoly I. Frenkel, David Somerville, Charles W. Hills, John R. Shapley, Ralph G. Nuzzo

Research output: Contribution to journalArticlepeer-review


The reductive condensation of a carbon-supported molecular cluster precursor, PtRu5C(CO)16, into a bimetallic nanoparticle has been followed by using in situ extended X-ray absorption fine structure spectroscopy, temperature-programmed desorption, and scanning transmission electron microscopy. The data reveal that during activation in hydrogen the metal centers associated with the molecular precursor lose the stabilizing CO shell and assume an increasingly metallic electronic character. This support- mediated condensation process is highly activated. The incipient Pt-Ru nanoparticles initially form a disordered structure at 473 K in which Pt is found preferentially at the core of the condensing particle. After further high-temperature treatment to 673 K, the nanoparticles adopt an inverted structure in which Pt appears preferentially at the surface of the equilibrated bimetallic nanoparticle.

Original languageEnglish (US)
Pages (from-to)8093-8101
Number of pages9
JournalJournal of the American Chemical Society
Issue number32
StatePublished - Aug 19 1998

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry


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