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          Institute: Fritz-Haber-Institut     Collection: Physical Chemistry     Display Documents

ID: 256747.0, Fritz-Haber-Institut / Physical Chemistry
The epitaxial growth of Pd electrodeposition on Au(100) studied by LEED and RHEED
Authors:Pinheiro, Alexei L. N.; Zei, Mau-Scheng; Luo, Meng-Fan; Ertl, Gerhard
Date of Publication (YYYY-MM-DD):2006-02-01
Title of Journal:Surface Science
Journal Abbrev.:Surf. Sci.
Issue / Number:3
Start Page:641
End Page:650
Copyright:© 2005 Elsevier B.V. All rights reserved.
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:The epitaxial growth of Pd adlayers electrochemically deposited onto Au(100) has been studied by LEED, RHEED and AES. For the first 6 ML, the Pd deposits grow pseudomorphically on Au(100) with a lateral expansion of 4.5% with respect to bulk Pd. The strain in the expanded commensurate (I x 1) Pd layers on Au(100) begins to be relieved at the Pd coverage between 6 and 9 ML range by formation of a compressed Pd film with respect to Au(100) surface and the compression increases continuously with thickness. At ca. 20 ML Pd the lattice constant of the film approaches to the bulk Pd and three-dimensional Pd islands develop since around 30 ML coverage. No superstructure due to the Pd-Au surface alloy can be found for coverages from monolayer up to 30 ML Pd on Au(100). A c(2 x 2) phase has been observed on the Pd-deposited Au(100) electrodes, which is ascribed to ordered Cl adlayers adsorbed on Pd adlayers rather than a Pd-Au surface alloy.
Free Keywords:Auger electron spectroscopy; Palladium; Reflection high-energy electron diffraction (RHEED); Metal-electrolyte interfaces; Cyclic voltammetry; Single crystal epitaxy; Underpotentially deposited copper; Surface alloy; Ultrathin films; Initial-stages; Au(111); Monolayer; Overlayers; Oxidation; Au(hkl); Layer
External Publication Status:published
Document Type:Article
Communicated by:Gerhard Ertl
Affiliations:Fritz-Haber-Institut/Physical Chemistry
External Affiliations:Zei MS (zei@phy.ncu.edu.tw), Luo MF, Natl Cent Univ, Dept Phys & Nanocatalyst Res Ctr., Chungli, 32054 Taiwan
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