Electronic properties of thin Zn layers on Pd(111) during growth and alloying

Bayer A, Flechtner K, Denecke R, Steinrück HP, Neyman K, Rösch N (2006)

Publication Type: Journal article

Publication year: 2006

Journal

Surface Science Elsevier

Original Authors: Bayer A., Flechtner K., Denecke R., Steinrück H.-P., Neyman K.M., Rösch N.

Publisher: Elsevier

Book Volume: 600

Pages Range: 78-94

Journal Issue: 1

DOI: 10.1016/j.susc.2005.09.049

Abstract

The growth and alloying of thin Zn layers on Pd(1 1 1) was investigated using X-ray and ultraviolet photoelectron spectroscopy as well as low energy electron diffraction and correlated with density functional calculations. At 105 K, the formation of a pseudomorphic Zn monolayer is observed. Upon heating this layer to 550 K or upon deposition of 1 ML at 550 K, an ordered p(2 × 1) PdZn surface alloy with a Pd:Zn ratio of ∼1:1 is formed, with a characteristic Pd 3d peak at a binding energy of ∼335.6 eV. For deposition of 3 ML Zn at 550 K or by heating 3 ML, deposited at low temperature, to 500 or 600 K, a PdZn alloy with a Pd:Zn ratio of again ∼1:1 is found in the surface region, with a Pd 3d peak at ∼335.9 eV; the direct preparation at 550 K leads to a more homogeneous and better ordered alloy. The valence band spectrum of this alloy with a low density of states at the Fermi level and pronounced maxima due to the "Pd 4d" band at ∼2.4 and 3.9 eV closely resembles the spectrum of Cu(1 1 1), in good agreement with the calculated density of states for a PdZn alloy of 1:1 stoichiometry. The shift of the "Pd 4d" band to higher binding energies as compared to Pd(1 1 1) indicates a charge transfer from Zn to the Pd 4d levels. Overall, the similarity between the ultraviolet photoelectron spectra for the PdZn alloy and for Cu(1 1 1) is taken as explanation for the similar chemical activity of both systems in methanol steam reforming. © 2005 Elsevier B.V. All rights reserved.

Authors with CRIS profile

Andreas Bayer Lehrstuhl für Physikalische Chemie II Hans-Peter Steinrück Lehrstuhl für Physikalische Chemie II

Involved external institutions

Technische Universität München (TUM) DE Germany (DE) Institució Catalana de Recerca i Estudis Avançats (ICREA) / Catalan Institution for Research and Advanced Studies ES Spain (ES)

How to cite

APA:

Bayer, A., Flechtner, K., Denecke, R., Steinrück, H.-P., Neyman, K., & Rösch, N. (2006). Electronic properties of thin Zn layers on Pd(111) during growth and alloying. Surface Science, 600(1), 78-94. https://dx.doi.org/10.1016/j.susc.2005.09.049

MLA:

Bayer, Andreas, et al. "Electronic properties of thin Zn layers on Pd(111) during growth and alloying." Surface Science 600.1 (2006): 78-94.

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