Photoemission study of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>CO</mml:mi></mml:mrow></mml:math>adsorption on ordered<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>Pb</mml:mi><mml:mo>∕</mml:mo><mml:mi>Ni</mml:mi><mml:mspace width="0.3em" /><mml:mo>(</mml:mo><mml:mn>111</mml:mn><mml:mo>)</mml:mo></mml:mrow></mml:math>surface phases

Matolín, Vladimı́r; Matolı́nová, Iva; Tsud, Nataliya; Fabík, S.; Libra, J.; Dudr, V.; Cháb, V.

doi:10.1103/physrevb.74.075416

Cited by 12 publications

(7 citation statements)

References 22 publications

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“…The lack of new components and chemical shifts within the core level peaks is consistent with the immiscibility of Pb and Al. 9,10 We now describe observations of the self-assembly of the Pb monolayer at the atomic level. Figure 2 shows the AlPd-Mn surface after the adsorption of 0.2 ML of Pb.…”

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confidence: 99%

Self-assembly, structure, and electronic properties of a quasiperiodic lead monolayer

et al. 2008

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A quasiperiodic Pb monolayer has been formed on the five-fold surface of the Al-Pd-Mn quasicrystal. Growth of the monolayer proceeds via self-assembly of an interconnected network of pentagonal Pb stars, which are shown to be τ -inflated compared to similar structural elements of the quasiperiodic substrate. Measurements of the electronic structure of the system using scanning tunnelling spectroscopy and ultra-violet photoemission spectroscopy reveal that the Pb monolayer displays a pseudo-gap at the Fermi level which is directly related to its quasiperiodic structure.

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confidence: 99%

Self-assembly, structure, and electronic properties of a quasiperiodic lead monolayer

et al. 2008

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“…The amplitude of the surface alloy rumpling was found to be 0.73 Å. In our previous work, 11 we have shown that the transformation to the ͑ ͱ 3 ϫ ͱ 3͒R30°structure was accompanied by the appearance of a strong photoelectron diffraction effect, confirming the embedding of Pb atoms in the Ni͑111͒ first surface layer. The Pb 5d core level shift indicated charge transfer from Pb to the surface, particularly for ͑4 ϫ 4͒ and ͑ ͱ 3 ϫ ͱ 3͒R30°structures.…”

Section: Introductionmentioning

confidence: 64%

“…5, as well as from a weaker bonding of CO on the surface. 11 This band shift leads to a decrease of the spin polarization of the itinerant d electrons ͑n ↑ -n ↓ per atom͒. The shift to higher binding energy can explain why the collapsed band of the alloy is located at the same energy of 0.2 eV as the majority band of the clean Ni in Fig.…”

Section: Discussionmentioning

confidence: 93%

“…Cleaning was performed by cycles of sputtering and flashing to 970 K until no contamination was detected by XPS. The Pb metal was evaporated from a Knudsen cell onto the clean Ni͑111͒ surface at 300 K. 11 Pb deposition for 6 min corresponded to the formation of a complete ͑3 ϫ 3͒ structure, i.e., to the formation of one close packed monolayer of lead. This result was used to calibrate the evaporation time in terms of coverage.…”

Section: Methodsmentioning

confidence: 99%

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Angle-resolved photoemission of orderedPb∕Ni(111)surface phases

2007

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Pb/ Ni͑111͒ surface phases were investigated by angle-resolved photoemission spectroscopy. Annealing of the Pb/ Ni͑111͒ surface led to the formation of the ͑ ͱ 3 ϫ ͱ 3͒R30°reconstruction characterized by a topmost layer consisting of a substitutional alloy. The transformation to the ͑ ͱ 3 ϫ ͱ 3͒R30°structure was accompanied by a modification of the surface band structure confirming the formation of a new phase in the Ni͑111͒ surface layer, characterized by a transformation from ferromagnetic to a nonmagnetic state. The modification was displayed as a disappearance of the k-dependent exchange splitting in the topmost alloy layer that was observed on the clean Ni surface due to the energy difference between spin-up and spin-down states. Fermi surface mapping showed partial disappearance of splitting of bands crossing the Fermi level.

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“…On valence band spectra of clean Ni crystal taken with primary energy 62 eV (upper spectrum) it is possible to distinguish very low contributions at 9 and 11.5 eV, which corresponds to CO molecular orbitals. [15] A new broad peak around 5 eV was observed, which could be assigned to methoxy. For further low contribution at 14.5 eV, we did not find any reference.…”

Section: Resultsmentioning

confidence: 97%

Photoemission study of methanol decomposition on Pt/Ni(111) surface alloy

Veltruská

Cabala

Libra

et al. 2010

Surface & Interface Analysis

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a Platinum shows excellent catalytic activity in electrochemical oxidation of methanol. It is widely used in direct methanol fuel cells, but it is readily poisoned by CO-like intermediates generated in methanol activation process. To increase Pt CO tolerance, oxophilic metals such as Ru or Ni are incorporated into Pt.In our model study we present results of the adsorption and decomposition of methanol on a Pt-Ni ordered surface alloy prepared by Pt evaporation on Ni(111) surface, examined by conventional and synchrotron radiation XPS. Methanol adsorbed at low temperature formed adsorbate multilayers, which were consecutively desorbed upon heating to 600 K. Reaction intermediates arising during desorption were measured. Reaction pathways are discussed and compared with those obtained on a clean Ni(111) single crystal.

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Photoemission study ofCOadsorption on orderedPb∕Ni(111)surface phases

Cited by 12 publications

References 22 publications

Self-assembly, structure, and electronic properties of a quasiperiodic lead monolayer

Self-assembly, structure, and electronic properties of a quasiperiodic lead monolayer

Angle-resolved photoemission of orderedPb∕Ni(111)surface phases

Photoemission study of methanol decomposition on Pt/Ni(111) surface alloy

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