Core Shell Inversion during Nucleation and Growth of Bimetallic Pt/Ru Nanoparticles

Core Shell Inversion during Nucleation and Growth of Bimetallic Pt/Ru Nanoparticles

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 d...

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Veröffentlicht in:Journal of the American Chemical Society 1998-08, Vol.120 (32), p.8093-8101
Hauptverfasser: Nashner, Michael S, Frenkel, Anatoly I, Somerville, David, Hills, Charles W, Shapley, John R, Nuzzo, Ralph G
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container_end_page 8101
container_issue 32
container_start_page 8093
container_title Journal of the American Chemical Society
container_volume 120
creator Nashner, Michael S
Frenkel, Anatoly I
Somerville, David
Hills, Charles W
Shapley, John R
Nuzzo, Ralph G
description 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.
doi_str_mv 10.1021/ja980638z
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title Core Shell Inversion during Nucleation and Growth of Bimetallic Pt/Ru Nanoparticles
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