Adsorption of CO and NO on NiO (111)/Ni(111) surface studied by infrared-visible sum frequency generation spectroscopy

Athula Bandara, Shinsaku Dobashi, Jun Kubota, Ken Onda, Akihide Wada, Kazunari Domen, Chiaki Hirose, Satoru S. Kano

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Abstract

Adsorption of CO and NO on NiO(111) thin films epitaxially grown on Ni(111) substrate has been studied by infrared-visible sum frequency generation (SFG) and the results were compared with those of infrared reflection absorption spectroscopy. From SFG measurements, the C-O stretching band of adsorbed CO was observed at 2144 cm-1 for both p- and s-polarized visible (532 nm) light whereas the adsorbed NO gave the N-O stretching band at 1800 cm-1 only for the p-polarized visible light. These observations suggested that the CO molecule was inclined to the surface whereas the tilt angle of NO from the surface normal was smaller than that of CO. The adsorption sites of CO and NO molecules are located on the slopes of trigonal microfacets formed by the reconstruction of the NiO(111) surface. CO adsorbed on Ni(111) instead of NiO(111) was also examined: the SFG signal corresponding to the C-O stretching mode of linearly bonded CO was observed at 2076 cm-1 only for the p-polarized visible light, but that of the bridge-bonded one (at saturation coverage) was not detected by SFG.

Original languageEnglish
Pages (from-to)312-319
Number of pages8
JournalSurface Science
Volume387
Issue number1-3
DOIs
Publication statusPublished - Oct 8 1997
Externally publishedYes

All Science Journal Classification (ASJC) codes

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

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