Infrared reflection absorption study for carbon monoxide adsorption on chromium deposited Cu(100) surfaces

T. Wadayama, H. Yoshida, S. Oda, N. Todoroki

Research output: Contribution to journalArticlepeer-review

Abstract

This study investigates carbon monoxide (CO) adsorption and desorption behaviors on 0.1-0.6-nm-thick Cr-deposited Cu(100) surfaces using infrared reflection absorption (IRRAS) and temperature-programmed desorption (TPD) spectroscopic methods. The low-energy electron diffraction (LEED) pattern for the 0.1-nm-thick Cr-deposited Cu(100) surface indicates that distorted bcc-Cr(110) grows on fcc-Cu(100). The CO exposure to a clean Cu( 100) at 90 K produces a single and sharp IR absorption band at 2090 cm-1 that is attributable to adsorbed CO on the on-top site of the Cu atoms' on the surface. Two absorption bands are located at 2085 and 2105 cm-1 on the IRRAS spectrum for the COsaturated 0.1-nm-thick Cr/Cu(110) surface. The former might originate from linearly bonded CO on the uncovered Cu substrate surface. With increasing Cr thickness, the latter high-frequency band becomes prominent. For the 0.3-nm-thick Cr surface, the band at 2117 cm-1 dominates all spectra through CO exposure. The TPD spectra of the Cr-deposited Cu surfaces show two remarkable features at 220-250 and 320-390 K, which are ascribable respectively to Cu-CO and Cr-CO bonds. Lower desorption peaks shift to higher temperatures with increasing Cr thickness. Based on TPD and IRRAS results, adsorption-desorption behaviors of CO on the Cr-deposited Cu(100) surfaces are discussed herein.

Original languageEnglish
Pages (from-to)819-824
Number of pages6
JournalMaterials Transactions
Volume50
Issue number4
DOIs
Publication statusPublished - 2009 Apr

Keywords

  • Chromium
  • Copper
  • Infrared absorption spectroscopy
  • Lowenergy electron diffraction
  • Reflection high-energy electron diffraction
  • Surface alloy
  • Temperature-programmed desorption spectroscopy

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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