BIMETALLIC AGGREGATES AT SURFACES - SPECTROMICROSCOPY STUDY OF PT-AG INTERACTION ON GRAPHITE

Authors
CASALIS L GUNTHER S KOVAC J MARSI M KISKINOVA M BIFONE A
Citation
L. Casalis et al., BIMETALLIC AGGREGATES AT SURFACES - SPECTROMICROSCOPY STUDY OF PT-AG INTERACTION ON GRAPHITE, Chemical physics letters, 290(1-3), 1998, pp. 245-250
Citations number
24
Categorie Soggetti
Physics, Atomic, Molecular & Chemical
Journal title
Chemical physics letters → ACNP
ISSN journal
00092614
Volume
290
Issue
1-3
Year of publication
1998
Pages
245 - 250
Database
ISI
SICI code
0009-2614(1998)290:1-3<245:BAAS-S>2.0.ZU;2-7
Abstract
The formation of bimetallic Pt/Ag alloy in an amorphous Ag film suppor ted on highly oriented pyrolitic graphite has been investigated with s canning photoemission and scanning tunneling microscopy. This spatiall y resolved study reveals that alloying strongly depends on the morphol ogy of the deposited metal. Whereas little metal intermixing is found in small Ag clusters (50 Angstrom), efficient alloying is observed in much larger heterogeneous structures. Subsequent annealing results in a decrease of the exposed alloy component, due to segregation of the t wo metal species. (C) 1998 Elsevier Science B.V. All rights reserved.