Core-level shifts at the Pt/W(110) monolayer bimetallic interface
- Title
- Core-level shifts at the Pt/W(110) monolayer bimetallic interface
- Authors
- Riffe, DM; Shinn, ND; Kim, B; Kim, KJ; Kang, TH; null
- Date Issued
- 2009-12
- Publisher
- ELSEVIER SCIENCE BV
- Abstract
- 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.
- Keywords
- Bimetallic surfaces; Nickel; Palladium; Platinum; Soft X-ray photoelectron spectroscopy; Surface electronic structure; Tungsten; BINDING-ENERGY SHIFTS; X-RAY-PHOTOEMISSION; TRANSITION-METAL SURFACES; 110 TUNGSTEN SURFACES; ULTRATHIN PD LAYERS; PHOTOELECTRON-SPECTROSCOPY; ELECTRONIC-STRUCTURE; CHEMICAL-PROPERTIES; SEGREGATION ENERGIES; BONDING MECHANISM
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/27686
- DOI
- 10.1016/J.SUSC.2009.10.006
- ISSN
- 0039-6028
- Article Type
- Article
- Files in This Item:
- There are no files associated with this item.
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