Mn/Pt(111) interface investigated at the first stages of formation via AES and STM

Scarselli, Manuela; Dragone, L.; Sgarlata, A.; Fanfoni, M.; Castro, V. Di; Zanoni, R.

doi:10.1016/j.susc.2003.09.006

Cited by 3 publications

(2 citation statements)

References 15 publications

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“…Annealing 10 ML Mn/Pt(111) to 650 °C in UHV would produce an alternate sequence of Pt(111) and Pt 3 Mn(111)like planes with a 100% Pt top-most surface layer, whereas annealing the same sample to 500 °C in UHV would produce the top-most layer containing Pt and coexisting Pt 3 Mn structure. 31 Scarselli et al 32 investigated the deposition of Mn on Pt(111) via Auger electron spectroscopy and scanning tunneling microscopy. They showed that the Pt 0.89 Mn 0.11 intermixed phase formed at room temperature, and Mn atoms extended down to 14 layers in the early growth stage (0.5−1.5 ML).…”

Section: Introductionmentioning

confidence: 99%

Atmosphere-Dependent Structures of Pt–Mn Bimetallic Catalysts

Zhang

Zhao

et al. 2020

J. Phys. Chem. C

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Pt−Mn bimetallic catalysts exhibit high activity in many heterogeneous catalytic and electrocatalytic reactions. However, the surface structure of Pt−Mn catalysts under different reaction conditions remains less explored. This work describes the construction of different surface structures of the Mn/Pt(111) model system via controlling atmospheres at variable temperatures. Our results suggest that the Pt−Mn surface alloy and nearsurface alloy can be obtained upon low-temperature and high-temperature annealing in ultrahigh vacuum, respectively. With high-temperature oxidation, near-surface Mn atoms under the Pt-skin surface segregate outwards to form MnO on the Pt(111) surface. Structural transformation between MnO/ Pt(111) and Pt−Mn near-surface alloy can be repeated by alternate hightemperature oxidative and reductive treatments. CO adsorption sites change from Mn sites to Pt sites with the surface structure transformed from Mn/Pt(111) to Pt−Mn surface alloy. CO vibrational peaks shift to lower wavenumbers when the surface structure changes from Pt−Mn surface alloy to near-surface alloy. CO desorbs more easily on the surfaces of Pt−Mn surface alloy and Pt−Mn near-surface alloy compared with the clean Pt(111) surface because of the downshift of d-band center of surface Pt atoms. The feasible modulation of Pt−Mn surface structure provides a guidance for the rational design of Pt−Mn bimetallic catalysts.

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Section: Introductionmentioning

confidence: 99%

Atmosphere-Dependent Structures of Pt–Mn Bimetallic Catalysts

Zhang

Zhao

et al. 2020

J. Phys. Chem. C

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“…The morphology of such thin films can influence the magnetic properties significantly . The 3 d transition metal Mn has drawn much attention in ultrathin magnetic film research in the last decades, not only because of its large atomic magnetic moment resulting from the half‐filled d orbital, but also due to the diversity of phases when epitaxially grown on different substrates . The crystalline structure, in some way, determines the properties of thin films.…”

Section: Introductionmentioning

confidence: 99%

The Growth and Crystalline Structure of Ultrathin Mn Films on Ni(111)

Song

Kuch

2018

Physica Status Solidi (b)

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The growth and crystalline structure of ultrathin Mn films are studied in terms of thickness and temperature by scanning tunneling microscopy (STM) as well as medium‐ and low‐energy electron diffraction. We show that the Mn films deposited at room temperature exhibit a thickness‐dependent growth behavior with a layer‐by‐layer growth mode up to 5.3 monolayers. Two transitions in the growth mode can be observed in this range. Atomically resolved STM images of a submonolayer of Mn on Ni(111) reveal a lateral lattice distortion which becomes less significant after the islands form a wetting layer at room temperature. The low‐temperature‐deposited wetting layer shows a metastable lattice distortion which vanishes after annealing to room or higher temperatures. This phenomenon may be attributed to a temperature‐dependent metastable arrangement of the Mn adlayer as well as the distinct interaction strength between Mn–Mn and Mn–Ni atoms. Low‐temperature‐grown thick Mn films exhibit a Stranski–Krastanov growth mode with a stable (3×3)R 30° reconstruction, which remains stable up to room temperature.

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Growth, atomic structure, and vibrational properties of MnO ultrathin films on Pt(111)

et al. 2008

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Ultrathin films of MnO have been grown by reactive metal deposition in an O2 atmosphere on Pt(111) and studied using scanning tunneling microscopy (STM), low-energy electron diffraction, temperature programmed desorption, and high-resolution electron energy loss spectroscopy. In situ STM experiments which have been performed during film growth at elevated temperatures show that MnO grows highly ordered in a layerlike mode on Pt(111). The first MnO monolayer exhibits large, uniaxial reconstructed domains with a (19×1) periodicity, which results in rotational domains on the hexagonal Pt(111) substrate. Growth and structural properties of the (19×1) reconstruction are discussed in a model based on long-range ordering of antiphase boundaries within a uniaxially reconstructed and otherwise bulklike MnO(001) monolayer. The vibrational spectra for the MnO monolayer are dominated by a strong and narrow surface phonon peak at 368 cm-1, which is identified as the out-of-plane vib ration of the O sublattice against the Mn sublattice based on the O16 to O18 isotope shift. After completion of the MnO monolayer, multilayer growth mode is found at higher coverages (>1.5 ML). The appearance of the second MnO layer is accompanied by an additional Fuchs-Kliewer phonon mode at 545 cm-1

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Mn/Pt(111) interface investigated at the first stages of formation via AES and STM

Cited by 3 publications

References 15 publications

Atmosphere-Dependent Structures of Pt–Mn Bimetallic Catalysts

Atmosphere-Dependent Structures of Pt–Mn Bimetallic Catalysts

The Growth and Crystalline Structure of Ultrathin Mn Films on Ni(111)

Growth, atomic structure, and vibrational properties of MnO ultrathin films on Pt(111)

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