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

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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.
Originele taal-2Engels
Pagina's (van-tot)3667-3673
TijdschriftSurface Science
Volume602
Nummer van het tijdschrift24
DOI's
StatusGepubliceerd - 2008

Vingerafdruk

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

Citeer dit

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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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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, Nr. 24, 2008, blz. 3667-3673.

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer 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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SP - 3667

EP - 3673

JO - Surface Science

JF - Surface Science

SN - 0039-6028

IS - 24

ER -