Structural and electronic properties of Sn overlayers and Pd/Sn surface alloys on Pd(111)

AF Lee, Christopher John Baddeley, MS Tikhov, RM Lambert

Research output: Contribution to journalArticlepeer-review

49 Citations (Scopus)

Abstract

The first two layers of Sn deposited on Pd(lll) at 300 K grow in layer-by-layer fashion after which crystallite formation commences. The electronic properties of these overlayers are dependent on the size of the 3D sn islands. The occurrence of Sn --> Pd Valence charge-transfer is inferred, due allowance being made for initial and final state effects in the photoemission data. Evidence is presented for a significant Pd surface core-level shift enhancement by Sn of approximate to 0.7 eV. Depending on the initial Sn loading, heating generates stable monolayer (Pd,Sn) or multilayer (Pd,Sn) surface alloys exhibiting root 3 and (2 x 2) periodicities, respectively. The very different CO adsorption capacity of these two phases indicates that on Pd/Sn alloy surfaces, only pure Pd threefold hollow-sites are capable of strongly chemisorbing CO. (C) 1997 Elsevier Science B.V.

Original languageEnglish
Pages (from-to)195
Number of pages195
JournalSurface Science
Volume373
Publication statusPublished - 1 Mar 1997

Keywords

  • auger electron spectroscopy
  • carbon monoxide
  • catalysis
  • growth
  • low energy electron diffraction (leed)
  • palladium
  • tin
  • X-ray photoelectron spectroscopy
  • ALKALI-ION-SCATTERING
  • CORE-LEVEL SHIFTS
  • CHEMICAL-PROPERTIES
  • PT(111)
  • ADSORPTION
  • ACETYLENE
  • BENZENE
  • NI(111)
  • CHEMISORPTION
  • CONVERSION

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