Oxygen-induced nano-faceting of Ir(2 1 0)

Ivan Ermanoski, Kalman Pelhos, Wenhua Chen, Jamie S. Quinton, Theodore E. Madey

Research output: Contribution to journalArticle

50 Scopus citations

Abstract

The adsorption of oxygen and the nanometer-scale faceting induced by oxygen have been studied on Ir(210). Oxygen is found to chemisorb dissociatively on Ir(210) at room temperature. The molecular desorption process is complex, as revealed by a detailed kinetic analysis of desorption spectra. Pyramid-shaped facets with {311} and (110) orientations are formed on the oxygen-covered Ir(210) surface when annealed to T ≥ 600 K. The surface remains faceted for substrate temperatures T < 850 K. For T > 850 K, the substrate structure reverts to the oxygen-covered (210) planar state and does so reversibly, provided that oxygen is not lost due to desorption or via chemical reactions upon which the planar (210) structure remains. A clean faceted surface was prepared through the use of low temperature surface cleaning methods: using CO oxidation, or reaction of H2 to form H2O, oxygen can be removed from the surface while preserving ("freezing") the faceted structure. The resulting clean faceted surface remains stable for T < 600 K. For temperatures above this value, the surface irreversibly relaxes to the planar state.

Original languageEnglish (US)
Pages (from-to)1-23
Number of pages23
JournalSurface Science
Volume549
Issue number1
DOIs
StatePublished - Jan 10 2004
Externally publishedYes

Keywords

  • Auger electron spectroscopy
  • Chemisorption
  • Faceting
  • Iridium
  • Low energy electron diffraction (LEED)
  • Oxygen
  • Thermal desorption

ASJC Scopus subject areas

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

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  • Cite this

    Ermanoski, I., Pelhos, K., Chen, W., Quinton, J. S., & Madey, T. E. (2004). Oxygen-induced nano-faceting of Ir(2 1 0). Surface Science, 549(1), 1-23. https://doi.org/10.1016/j.susc.2003.10.052