Potassium and potassium oxide monolayers on the platinum (111) and stepped (755) crystal surfaces: A LEED, AES, and TDS study

E. L. Garfunkel, G. A. Somorjai

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Abstract

The adsorption of potassium and the coadsorption of potassium and oxygen on the Pt(111) and stepped Pt(755) crystal surfaces were studied by AES, LEED, and TDS. Pure potassium adlayers were found by LEED to be hexagonally ordered on Pt(111) at coverages of θ = K0.9-;1. The monolayer coverage was 5.4 × 1014K atoms/cm2 (0.36 times the atomic density of the Pt(111) surface). Orientational reordering of the adlayers, similar to the behavior of noble gas phase transitions on metals, was observed. The heat of desorption of K decreased, due to depolarization effects, from 60 kcal/mole at θK <0.1, to 25 kcal/mole at θK = 1 on both Pt(111) and Pt(755). Exposure to oxygen thermally stabilizes a potassium monolayer, increasing the heat of desorption from 25 to 50 kcal/mole. Both potassium and oxygen were found to desorb simultaneously indicating strong interactions in the adsorbed overlayer. LEED results on Pt(111) further indicate that a planar K2O layer may be formed by annealing coadsorbed potassium and oxygen to 750 K.

Original languageEnglish
Pages (from-to)441-454
Number of pages14
JournalSurface Science
Volume115
Issue number2
DOIs
Publication statusPublished - Mar 1 1982

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ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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