The epitaxial growth of Pd electrodeposition on Au(1 0 0) studied by LEED and RHEED

A. L.N. Pinheiro, M. S. Zei, M. F. Luo, G. Ertl

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The epitaxial growth of Pd adlayers electrochemically deposited onto Au(1 0 0) has been studied by LEED, RHEED and AES. For the first 6 ML, the Pd deposits grow pseudomorphically on Au(1 0 0) with a lateral expansion of 4.5% with respect to bulk Pd. The strain in the expanded commensurate (1 × 1) Pd layers on Au(1 0 0) 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(1 0 0) 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(1 0 0). A c(2 × 2) phase has been observed on the Pd-deposited Au(1 0 0) electrodes, which is ascribed to an ordered Cl adlayers adsorbed on Pd adlayers rather than a Pd-Au surface alloy.

Original languageEnglish
Pages (from-to)641-650
Number of pages10
JournalSurface Science
Issue number3
StatePublished - 1 Feb 2006


  • Auger electron spectroscopy
  • Cyclic voltammetry
  • Metal-electrolyte interfaces
  • Palladium
  • Reflection high-energy electron diffraction (RHEED)
  • Single crystal epitaxy


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