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Title:Structural Characterization and Phase Behavior in Supported Metallic Nanoparticles
Author(s):Hills, Charles West
Doctoral Committee Chair(s):Nuzzo, Ralph G.
Department / Program:Chemistry
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Chemistry, Analytical
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 stabilizing CO shell is lost, and the metal centers assume an increasingly metallic electronic character. 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. (Abstract shortened by UMI.).
Issue Date:2001
Description:157 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2001.
Other Identifier(s):(MiAaPQ)AAI3023073
Date Available in IDEALS:2015-09-25
Date Deposited:2001

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