Hydrogen superstructures on Co nanoislands and Cu(1 1 1)

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Abstract

Surface structures and related electronic properties of flat Co nanoislands supported on Cu(1 1 1) are studied before and after adsorbing different doses of molecular hydrogen at 10 K by low-temperature scanning tunneling microscopy/spectroscopy (STM/STS) at 5 K. It is found that the adsorption process on Co consists in two steps. First, H2 dissociatively chemisorbs on Co forming an atomic H adlayer. Subsequently, molecules impinging on that H-terminated Co surface are physisorbed. When adsorbing a low dose of hydrogen on the Co/Cu(1 1 1) system, STM analysis shows that the chemisorbed hydrogen adlayer on Co forms a p(2 × 2) superstructure. On Cu surface however, no superstructure is observed. When adsorbing a high dose of H2, hydrogen-induced superstructures are observed on both Co and Cu surfaces. These superstructures are ascribed to the presence of physisorbed molecules as revealed by the STS spectra. A (3 × 3) superstructure is observed on Co and a mixture of (2 × 2) and (3 × 3) is identified on Cu. A model describing the adsorption sites of molecules is proposed: H2 molecules occupy on-top sites when arranged as a (2 × 2) phase and they occupy on-top and bridge sites when arranged as a (3 × 3) phase. Besides, STM-induced desorption is used to desorb atomic hydrogen from selected Co nanoisland surface. The desorption is visualized in terms of a disappearance of the p(2 × 2) superstructure.
LanguageEnglish
Pages3667-3673
JournalSurface Science
Volume602
Issue number24
DOIs
StatePublished - 2008

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Hydrogen
hydrogen
Molecules
dosage
molecules
Desorption
desorption
Adsorption
space transportation system
adsorption
systems analysis
Scanning tunneling microscopy
Surface structure
Electronic properties
scanning tunneling microscopy
Spectroscopy
electronics
spectroscopy
Temperature

Cite this

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title = "Hydrogen superstructures on Co nanoislands and Cu(1 1 1)",
abstract = "Surface structures and related electronic properties of flat Co nanoislands supported on Cu(1 1 1) are studied before and after adsorbing different doses of molecular hydrogen at 10 K by low-temperature scanning tunneling microscopy/spectroscopy (STM/STS) at 5 K. It is found that the adsorption process on Co consists in two steps. First, H2 dissociatively chemisorbs on Co forming an atomic H adlayer. Subsequently, molecules impinging on that H-terminated Co surface are physisorbed. When adsorbing a low dose of hydrogen on the Co/Cu(1 1 1) system, STM analysis shows that the chemisorbed hydrogen adlayer on Co forms a p(2 × 2) superstructure. On Cu surface however, no superstructure is observed. When adsorbing a high dose of H2, hydrogen-induced superstructures are observed on both Co and Cu surfaces. These superstructures are ascribed to the presence of physisorbed molecules as revealed by the STS spectra. A (3 × 3) superstructure is observed on Co and a mixture of (2 × 2) and (3 × 3) is identified on Cu. A model describing the adsorption sites of molecules is proposed: H2 molecules occupy on-top sites when arranged as a (2 × 2) phase and they occupy on-top and bridge sites when arranged as a (3 × 3) phase. Besides, STM-induced desorption is used to desorb atomic hydrogen from selected Co nanoisland surface. The desorption is visualized in terms of a disappearance of the p(2 × 2) superstructure.",
author = "M.V. Sicot and O. Kurnosikov and H.J.M. Swagten and B. Koopmans",
year = "2008",
doi = "10.1016/j.susc.2008.10.012",
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pages = "3667--3673",
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Hydrogen superstructures on Co nanoislands and Cu(1 1 1). / Sicot, M.V.; Kurnosikov, O.; Swagten, H.J.M.; Koopmans, B.

In: Surface Science, Vol. 602, No. 24, 2008, p. 3667-3673.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Hydrogen superstructures on Co nanoislands and Cu(1 1 1)

AU - Sicot,M.V.

AU - Kurnosikov,O.

AU - Swagten,H.J.M.

AU - Koopmans,B.

PY - 2008

Y1 - 2008

N2 - Surface structures and related electronic properties of flat Co nanoislands supported on Cu(1 1 1) are studied before and after adsorbing different doses of molecular hydrogen at 10 K by low-temperature scanning tunneling microscopy/spectroscopy (STM/STS) at 5 K. It is found that the adsorption process on Co consists in two steps. First, H2 dissociatively chemisorbs on Co forming an atomic H adlayer. Subsequently, molecules impinging on that H-terminated Co surface are physisorbed. When adsorbing a low dose of hydrogen on the Co/Cu(1 1 1) system, STM analysis shows that the chemisorbed hydrogen adlayer on Co forms a p(2 × 2) superstructure. On Cu surface however, no superstructure is observed. When adsorbing a high dose of H2, hydrogen-induced superstructures are observed on both Co and Cu surfaces. These superstructures are ascribed to the presence of physisorbed molecules as revealed by the STS spectra. A (3 × 3) superstructure is observed on Co and a mixture of (2 × 2) and (3 × 3) is identified on Cu. A model describing the adsorption sites of molecules is proposed: H2 molecules occupy on-top sites when arranged as a (2 × 2) phase and they occupy on-top and bridge sites when arranged as a (3 × 3) phase. Besides, STM-induced desorption is used to desorb atomic hydrogen from selected Co nanoisland surface. The desorption is visualized in terms of a disappearance of the p(2 × 2) superstructure.

AB - Surface structures and related electronic properties of flat Co nanoislands supported on Cu(1 1 1) are studied before and after adsorbing different doses of molecular hydrogen at 10 K by low-temperature scanning tunneling microscopy/spectroscopy (STM/STS) at 5 K. It is found that the adsorption process on Co consists in two steps. First, H2 dissociatively chemisorbs on Co forming an atomic H adlayer. Subsequently, molecules impinging on that H-terminated Co surface are physisorbed. When adsorbing a low dose of hydrogen on the Co/Cu(1 1 1) system, STM analysis shows that the chemisorbed hydrogen adlayer on Co forms a p(2 × 2) superstructure. On Cu surface however, no superstructure is observed. When adsorbing a high dose of H2, hydrogen-induced superstructures are observed on both Co and Cu surfaces. These superstructures are ascribed to the presence of physisorbed molecules as revealed by the STS spectra. A (3 × 3) superstructure is observed on Co and a mixture of (2 × 2) and (3 × 3) is identified on Cu. A model describing the adsorption sites of molecules is proposed: H2 molecules occupy on-top sites when arranged as a (2 × 2) phase and they occupy on-top and bridge sites when arranged as a (3 × 3) phase. Besides, STM-induced desorption is used to desorb atomic hydrogen from selected Co nanoisland surface. The desorption is visualized in terms of a disappearance of the p(2 × 2) superstructure.

U2 - 10.1016/j.susc.2008.10.012

DO - 10.1016/j.susc.2008.10.012

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T2 - Surface Science

JF - Surface Science

SN - 0039-6028

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ER -