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

doi:10.1021/ja980638z

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 journal › Article › peer-review

Abstract

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 language	English (US)
Pages (from-to)	8093-8101
Number of pages	9
Journal	Journal of the American Chemical Society
Volume	120
Issue number	32
DOIs	https://doi.org/10.1021/ja980638z
State	Published - Aug 19 1998

ASJC Scopus subject areas

Catalysis
Chemistry(all)
Biochemistry
Colloid and Surface Chemistry

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title = "Core shell inversion during nucleation and growth of bimetallic Pt/Ru nanoparticles",

abstract = "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.",

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T1 - Core shell inversion during nucleation and growth of bimetallic Pt/Ru nanoparticles

AU - Nashner, Michael S.

AU - Frenkel, Anatoly I.

AU - Somerville, David

AU - Hills, Charles W.

AU - Shapley, John R.

AU - Nuzzo, Ralph G.

PY - 1998/8/19

Y1 - 1998/8/19

N2 - 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.

AB - 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.

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

Abstract

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