IRRAS and TPD investigations of carbon monoxide adsorption on MBE grown Fe on Pt(100)

Toshimasa Wadayama, Hirosato Yoshida, Naoto Todoroki, Shogo Oda

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Infrared reflection absorption spectroscopy (IRRAS) and temperature programmed desorption (TPD) were used to investigate carbon monoxide (CO) adsorption on 0.25-1.0 monolayer (ML)-thick Fe deposited Pt(100) (Fe ∞(∞=0:25-1:0ML)/Pt(100)). The cleaned Pt(100) surface shows 5×20 reconstruction (Pt(100)-hex). The 1.0-LCO exposure to the Pt(100)-hex at 300 K yields linearly bonded CO-Pt bands at 2089 and 2081 cm -1. They are ascribable respectively to adsorbed CO on 1×1 and hex domains. Low-energy electron diffraction (LEED) patterns for the 343-K-deposited Fe/Pt(100) change from blurred hex (0.25 ML) to 1×1 (>0.5 ML), indicating that the outermost surface structures changed through Fe thickness. Regarding the Fe0:25ML/Pt(100), two bands are located at 2082 and 2069 cm-1 for the 1.0-L-CO exposed surface. The Fe0:5ML/Pt(100), however, reveals a single absorption band at 2050 cm-1. The CO exposure to the Fe1:0ML/Pt(100) generates a broad and more red-shifted band at 2027 cm-1. In contrast, the LEED pattern for Fe0:5ML/Pt(100) fabricated at 873 K shows hex reconstruction. The IRRAS spectrum recorded after 1.0-L-CO exposure for the 873 K deposited Fe0:5ML/Pt(100) shows an absorption band at 2073 cm-1 with narrow bandwidth. The CO desorption temperature for the Pt(100)-hex (about 520 K) was shifted to a lower temperature by Fe deposition: the temperatures are about 470 and 430 K for the Fe 0:5ML/Pt(100) fabricated substrate temperatures of 343 and 873 K. Based on IRRAS and TPD results, CO adsorption behavior on the Fex/Pt(100) is discussed.

Original languageEnglish
Pages (from-to)245-248
Number of pages4
Journale-Journal of Surface Science and Nanotechnology
Volume7
DOIs
Publication statusPublished - 2009 Apr 4

Keywords

  • Carbon monoxide
  • Infrared absorption spectroscopy
  • Iron
  • Platinum
  • Surface alloy
  • Temperature programmed desorption

ASJC Scopus subject areas

  • Biotechnology
  • Bioengineering
  • Condensed Matter Physics
  • Mechanics of Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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