Infrared reflection-absorption study of carbon monoxide adsorption on Fe/Pt(111) bimetallic surfaces

Toshimasa Wadayama; Hiroshi Osano; Toshiaki Maeyama; Hirosato Yoshida; Koji Murakami; Naoki Todoroki; Shogo Oda

doi:10.1021/jp712095w

Infrared reflection-absorption study of carbon monoxide adsorption on Fe/Pt(111) bimetallic surfaces

Toshimasa Wadayama, Hiroshi Osano, Toshiaki Maeyama, Hirosato Yoshida, Koji Murakami, Naoki Todoroki, Shogo Oda

ENV - Frontier Science for Advanced Environment

Research output: Contribution to journal › Article › peer-review

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Abstract

Infrared reflection-absorption spectroscopy (IRRAS) was used to investigate carbon monoxide (CO) adsorption on sub-monolayer (ML)-thick to 1.0 ML-thick Fe deposited Pt(111) bimetallic surfaces, that is, Fe_x/Pt(111) (x, Fe thickness in ML units), fabricated using molecular beam epitaxy at substrate temperatures of 343, 403, and 473 K. The 1.0 L CO exposure to a clean Pt(111) at room temperature yielded linearly bonded and bridge-bonded CO-Pt bands at 2093 and 1855 cm^-1. The CO-Pt band intensities for the CO-exposed surfaces of the Fe_x/Pt(111) decreased with increasing Fe thickness. The CO-Pt bands almost disappeared, and the bridge-bonded CO-Fe band at 1950 cm ^-1 dominated the spectra for the Fe_1.0ML/Pt(111) deposited at 343 K. In addition, the Fe deposition brought about a new absorption band at around 2060 cm^-1; this band is predominant for the Fe _0.5MI/Pt(111) deposited at 473 K. The 1 ML-thick Fe deposition onto the 473 K Pt(111) engenders less-intense, rather broad absorption at 2050 cm^-1, accompanied by a weak band attributable to bridge adsorption of CO on the surface Fe atoms. The IRRAS spectra for CO adsorption on the 0.6 nm and 0.3 nm-thick Pt grown on the Fe_1.0ML/Pt(111), that is, Pt _y/Fe_1.0ML/Pt(111) (y, Pt thickness in nm units), respectively, showed single absorption bands at 2080 and 2070 cm^-1. The reflection high-energy electron diffraction (RHEED) patterns for the Fe _1.0ML/Pt(111) deposited at 343 K gave rise to new RHEED streaks, outside the original streaks, attributable to the substrate Pt(111). In contrast, for Pt_y/Fe_1.0ML/Pt(111) "sandwich" structures, the new streaks disappeared, leaving streaks that had slightly wider separation than that of the clean Pt(111). The Fe_0.5ML/Pt(111) deposited at 473 K showed similar streaks to those of the Pt/Fe_1.0ML/ Pt(111). The temperature-programmed desorption (TPD) spectrum of adsorbed CO on the Fe_0.5ML/Pt(111) deposited at 473 K revealed a 40% weaker and 10 K lower desorption signal than those for the clean Pt(111). We discuss the CO adsorption behavior on the well-defined Fe deposited Pt(111) bimetallic surfaces.

Original language	English
Pages (from-to)	8944-8950
Number of pages	7
Journal	Journal of Physical Chemistry C
Volume	112
Issue number	24
DOIs	https://doi.org/10.1021/jp712095w
Publication status	Published - 2008 Jun 19

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Energy(all)
Physical and Theoretical Chemistry
Surfaces, Coatings and Films

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@article{2c98c452604a456cb1235dd6f75f2f44,

title = "Infrared reflection-absorption study of carbon monoxide adsorption on Fe/Pt(111) bimetallic surfaces",

abstract = "Infrared reflection-absorption spectroscopy (IRRAS) was used to investigate carbon monoxide (CO) adsorption on sub-monolayer (ML)-thick to 1.0 ML-thick Fe deposited Pt(111) bimetallic surfaces, that is, Fex/Pt(111) (x, Fe thickness in ML units), fabricated using molecular beam epitaxy at substrate temperatures of 343, 403, and 473 K. The 1.0 L CO exposure to a clean Pt(111) at room temperature yielded linearly bonded and bridge-bonded CO-Pt bands at 2093 and 1855 cm-1. The CO-Pt band intensities for the CO-exposed surfaces of the Fex/Pt(111) decreased with increasing Fe thickness. The CO-Pt bands almost disappeared, and the bridge-bonded CO-Fe band at 1950 cm -1 dominated the spectra for the Fe1.0ML/Pt(111) deposited at 343 K. In addition, the Fe deposition brought about a new absorption band at around 2060 cm-1; this band is predominant for the Fe 0.5MI/Pt(111) deposited at 473 K. The 1 ML-thick Fe deposition onto the 473 K Pt(111) engenders less-intense, rather broad absorption at 2050 cm-1, accompanied by a weak band attributable to bridge adsorption of CO on the surface Fe atoms. The IRRAS spectra for CO adsorption on the 0.6 nm and 0.3 nm-thick Pt grown on the Fe1.0ML/Pt(111), that is, Pt y/Fe1.0ML/Pt(111) (y, Pt thickness in nm units), respectively, showed single absorption bands at 2080 and 2070 cm-1. The reflection high-energy electron diffraction (RHEED) patterns for the Fe 1.0ML/Pt(111) deposited at 343 K gave rise to new RHEED streaks, outside the original streaks, attributable to the substrate Pt(111). In contrast, for Pty/Fe1.0ML/Pt(111) {"}sandwich{"} structures, the new streaks disappeared, leaving streaks that had slightly wider separation than that of the clean Pt(111). The Fe0.5ML/Pt(111) deposited at 473 K showed similar streaks to those of the Pt/Fe1.0ML/ Pt(111). The temperature-programmed desorption (TPD) spectrum of adsorbed CO on the Fe0.5ML/Pt(111) deposited at 473 K revealed a 40% weaker and 10 K lower desorption signal than those for the clean Pt(111). We discuss the CO adsorption behavior on the well-defined Fe deposited Pt(111) bimetallic surfaces.",

author = "Toshimasa Wadayama and Hiroshi Osano and Toshiaki Maeyama and Hirosato Yoshida and Koji Murakami and Naoki Todoroki and Shogo Oda",

year = "2008",

month = jun,

day = "19",

doi = "10.1021/jp712095w",

language = "English",

volume = "112",

pages = "8944--8950",

journal = "Journal of Physical Chemistry C",

issn = "1932-7447",

publisher = "American Chemical Society",

number = "24",

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TY - JOUR

T1 - Infrared reflection-absorption study of carbon monoxide adsorption on Fe/Pt(111) bimetallic surfaces

AU - Wadayama, Toshimasa

AU - Osano, Hiroshi

AU - Maeyama, Toshiaki

AU - Yoshida, Hirosato

AU - Murakami, Koji

AU - Todoroki, Naoki

AU - Oda, Shogo

PY - 2008/6/19

Y1 - 2008/6/19

N2 - Infrared reflection-absorption spectroscopy (IRRAS) was used to investigate carbon monoxide (CO) adsorption on sub-monolayer (ML)-thick to 1.0 ML-thick Fe deposited Pt(111) bimetallic surfaces, that is, Fex/Pt(111) (x, Fe thickness in ML units), fabricated using molecular beam epitaxy at substrate temperatures of 343, 403, and 473 K. The 1.0 L CO exposure to a clean Pt(111) at room temperature yielded linearly bonded and bridge-bonded CO-Pt bands at 2093 and 1855 cm-1. The CO-Pt band intensities for the CO-exposed surfaces of the Fex/Pt(111) decreased with increasing Fe thickness. The CO-Pt bands almost disappeared, and the bridge-bonded CO-Fe band at 1950 cm -1 dominated the spectra for the Fe1.0ML/Pt(111) deposited at 343 K. In addition, the Fe deposition brought about a new absorption band at around 2060 cm-1; this band is predominant for the Fe 0.5MI/Pt(111) deposited at 473 K. The 1 ML-thick Fe deposition onto the 473 K Pt(111) engenders less-intense, rather broad absorption at 2050 cm-1, accompanied by a weak band attributable to bridge adsorption of CO on the surface Fe atoms. The IRRAS spectra for CO adsorption on the 0.6 nm and 0.3 nm-thick Pt grown on the Fe1.0ML/Pt(111), that is, Pt y/Fe1.0ML/Pt(111) (y, Pt thickness in nm units), respectively, showed single absorption bands at 2080 and 2070 cm-1. The reflection high-energy electron diffraction (RHEED) patterns for the Fe 1.0ML/Pt(111) deposited at 343 K gave rise to new RHEED streaks, outside the original streaks, attributable to the substrate Pt(111). In contrast, for Pty/Fe1.0ML/Pt(111) "sandwich" structures, the new streaks disappeared, leaving streaks that had slightly wider separation than that of the clean Pt(111). The Fe0.5ML/Pt(111) deposited at 473 K showed similar streaks to those of the Pt/Fe1.0ML/ Pt(111). The temperature-programmed desorption (TPD) spectrum of adsorbed CO on the Fe0.5ML/Pt(111) deposited at 473 K revealed a 40% weaker and 10 K lower desorption signal than those for the clean Pt(111). We discuss the CO adsorption behavior on the well-defined Fe deposited Pt(111) bimetallic surfaces.

AB - Infrared reflection-absorption spectroscopy (IRRAS) was used to investigate carbon monoxide (CO) adsorption on sub-monolayer (ML)-thick to 1.0 ML-thick Fe deposited Pt(111) bimetallic surfaces, that is, Fex/Pt(111) (x, Fe thickness in ML units), fabricated using molecular beam epitaxy at substrate temperatures of 343, 403, and 473 K. The 1.0 L CO exposure to a clean Pt(111) at room temperature yielded linearly bonded and bridge-bonded CO-Pt bands at 2093 and 1855 cm-1. The CO-Pt band intensities for the CO-exposed surfaces of the Fex/Pt(111) decreased with increasing Fe thickness. The CO-Pt bands almost disappeared, and the bridge-bonded CO-Fe band at 1950 cm -1 dominated the spectra for the Fe1.0ML/Pt(111) deposited at 343 K. In addition, the Fe deposition brought about a new absorption band at around 2060 cm-1; this band is predominant for the Fe 0.5MI/Pt(111) deposited at 473 K. The 1 ML-thick Fe deposition onto the 473 K Pt(111) engenders less-intense, rather broad absorption at 2050 cm-1, accompanied by a weak band attributable to bridge adsorption of CO on the surface Fe atoms. The IRRAS spectra for CO adsorption on the 0.6 nm and 0.3 nm-thick Pt grown on the Fe1.0ML/Pt(111), that is, Pt y/Fe1.0ML/Pt(111) (y, Pt thickness in nm units), respectively, showed single absorption bands at 2080 and 2070 cm-1. The reflection high-energy electron diffraction (RHEED) patterns for the Fe 1.0ML/Pt(111) deposited at 343 K gave rise to new RHEED streaks, outside the original streaks, attributable to the substrate Pt(111). In contrast, for Pty/Fe1.0ML/Pt(111) "sandwich" structures, the new streaks disappeared, leaving streaks that had slightly wider separation than that of the clean Pt(111). The Fe0.5ML/Pt(111) deposited at 473 K showed similar streaks to those of the Pt/Fe1.0ML/ Pt(111). The temperature-programmed desorption (TPD) spectrum of adsorbed CO on the Fe0.5ML/Pt(111) deposited at 473 K revealed a 40% weaker and 10 K lower desorption signal than those for the clean Pt(111). We discuss the CO adsorption behavior on the well-defined Fe deposited Pt(111) bimetallic surfaces.

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U2 - 10.1021/jp712095w

DO - 10.1021/jp712095w

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VL - 112

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JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

IS - 24

ER -

Infrared reflection-absorption study of carbon monoxide adsorption on Fe/Pt(111) bimetallic surfaces

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