Carbon monoxide adsorption on Ni/Pt(111) surfaces investigated by infrared reflection absorption spectroscopy

Toshimasa Wadayama, Hirosato Yoshida, Naoto Todoroki, Shogo Oda

研究成果: Article査読

5 被引用数 (Scopus)

抄録

Infrared reflection absorption spectroscopic (IRRAS) measurements were conducted for carbon monoxide (CO) adsorption on Pt(111) bimetallic surfaces with various thicknesses of deposited Ni, i.e., Nix/Pt(111) (x, Ni thickness in nanometer units), which were fabricated using molecular beam epitaxy at substrate temperatures of 343-473 K. The reflection high-energy electron diffraction (RHEED) patterns for the 343-K-deposited Ni 0:1nm-0:6nm /Pt(111) reveal Ni epitaxial growth on Pt(111). The CO exposure to the clean Pt(111) surface at 323 K engenders linearly bonded and bridge-bonded CO-Pt bands at 2093 and 1858 cm-1. The 343-K-deposited Ni0:1nm /Pt(111) gives rise to a new band at 2070 cm-1 in addition to the CO-Pt(111) bands. T he new band is most prominent for the Ni0:3nm /Pt(111), on which the bridge-bonded CO on the Ni admetal layer appears at 1874 cm-1. For the Ni0:6nm /Pt(111), the 2070 cm-1 band decreases in intensity and the bridge-bonded CO on the Ni admetal-layerdominates the spectrum, with accompanying weak absorption at 2035 cm-1 caused by linearly adsorbed CO on the Ni layer. The low-energy electron diffraction (LEED) pattern for the 343-K-deposited Ni 0:3nm /Pt(111) shows incommensurate higher-order extra spots surrounding integer spots. In contrast, the incommensurate pattern changes to its original six-fold symmetry for the 473-K-deposited Ni0:3nm /Pt(111). In contrast, the RHEED pattern for the 473-K-deposited Ni 0:3nm /Pt(111) revealed streaks having slightly wider separations than those for the clean Pt(111). The IRRAS spectrum for the 1.0-L-CO exposed 473-K-deposited Ni0:3nm /Pt(111) reveals single-absorption at 2074 cm-1. We discuss the CO adsorption behavior of Nix/Pt(111) .

本文言語English
ページ(範囲)230-233
ページ数4
ジャーナルe-Journal of Surface Science and Nanotechnology
7
DOI
出版ステータスPublished - 2009 4月 4

ASJC Scopus subject areas

  • バイオテクノロジー
  • バイオエンジニアリング
  • 凝縮系物理学
  • 材料力学
  • 表面および界面
  • 表面、皮膜および薄膜

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