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

Journal article


Publication Details

Author(s): Bayer A, Flechtner K, Denecke R, Steinrück HP, Neyman K, Rösch N
Journal: Surface Science
Publisher: Elsevier
Publication year: 2006
Volume: 600
Journal issue: 1
Pages range: 78-94
ISSN: 0039-6028


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.


FAU Authors / FAU Editors

Bayer, Andreas Dr.
Lehrstuhl für Physikalische Chemie II
Steinrück, Hans-Peter Prof. Dr.
Lehrstuhl für Physikalische Chemie II


External institutions with authors

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


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.

BibTeX: 

Last updated on 2019-06-05 at 18:08