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

Materials Science and Engineering

University of Illinois at Urbana-Champaign

Research output: Contribution to journal › Article › peer-review

221 Scopus citations

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
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

Access to Document

10.1021/ja980638z

Cite this

@article{e1b532e51ef74f3fa161428679342c47,

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.",

author = "Nashner, \{Michael S.\} and Frenkel, \{Anatoly I.\} and David Somerville and Hills, \{Charles W.\} and Shapley, \{John R.\} and Nuzzo, \{Ralph G.\}",

year = "1998",

month = aug,

day = "19",

doi = "10.1021/ja980638z",

language = "English",

volume = "120",

pages = "8093--8101",

journal = "Journal of the American Chemical Society",

issn = "0002-7863",

number = "32",

}

TY - JOUR

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.

UR - https://www.scopus.com/pages/publications/0032547278

U2 - 10.1021/ja980638z

DO - 10.1021/ja980638z

M3 - Article

AN - SCOPUS:0032547278

SN - 0002-7863

VL - 120

SP - 8093

EP - 8101

JO - Journal of the American Chemical Society

JF - Journal of the American Chemical Society

IS - 32

ER -

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

Abstract

Access to Document

Other files and links

Fingerprint

Cite this