Core-level shifts at the Pt/W(110) monolayer bimetallic interface

SURFACE SCIENCE

卷:603

Article

Riffe, D. M.¹  Shinn, N. D.²  Kim, B.^3,4  Kim, K. J.⁵  Kang, T. -H.⁴ 

[1] Utah State Univ, Dept Phys, Logan, UT 84322 USA

[2] Sandia Natl Labs, Albuquerque, NM 87185 USA

[3] POSTECH, Dept Phys, Pohang 790784, Kyungbuk, South Korea

[4] Beamline Res Div, PAL, Pohang 790784, Kyungbuk, South Korea

[5] Konkuk Univ, Dept Phys, Seoul 143701, South Korea

关键词: Bimetallic surfaces;    Nickel;    Palladium;    Platinum;    Soft X-ray photoelectron spectroscopy;    Surface electronic structure;    Tungsten;   

DOI  :  10.1016/j.susc.2009.10.006

来源: Elsevier

【 摘 要 】

We have measured W and Pt 4f(7/2) core-level photoemission spectra from interfaces formed by ultrathin Pt layers on W(1 1 0), completing our core-level measurements of W(1 1 0)-based bimetallic interfaces involving the group-10 metals Ni, Pd, and Pt. With increasing Pt coverage the sequence of W spectra can be described using three interfacial core-level peaks with binding-energy (BE) shifts (compared to the bulk) of -0.220 +/- 0.015, -0.060 +/- 0.015, and +0.110 +/- 0.010 eV. We assign these features to 1D, 2D pseudomorphic (ps), and 2D closed-packed (cp) Pt phases, respectively. For similar to 1 ps ML the Pt 4f(7/2) BE is 71.40 +/- 0.02 eV, a shift of +0.46 +/- 0.09 eV with respect to the BE of bulk Pt metal. The W 4f(7/2) core-level shifts induced by all three adsorbates are semiquantitatively described by the Born-Haber-cycle based partial-shift model of Nilsson et al. [39]. As with Ni/W(1 1 0), the difference in W 4f(7/2) binding energies between ps and cp Pt phases has a large structural contribution. The Pt 4f lineshape is consistent with a small density of states at the Fermi level, reflective of the Pt monolayer having noble-metal-like electronic structure. (C) 2009 Elsevier B.V. All rights reserved.

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