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

被引:7
作者
Riffe, D. M. [1 ]
Shinn, N. D. [2 ]
Kim, B. [3 ,4 ]
Kim, K. J. [5 ]
Kang, T. -H. [4 ]
机构
[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; 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;
D O I
10.1016/j.susc.2009.10.006
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
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.
引用
收藏
页码:3431 / 3438
页数:8
相关论文
共 86 条
[1]   Photoelectron spectroscopy studies of the Pd/Ru(0001) and (Cu+Pd)/Ru(0001) interfaces [J].
Andersen, TH ;
Li, Z ;
Hoffmann, SV ;
Bech, L ;
Onsgaard, J .
JOURNAL OF PHYSICS-CONDENSED MATTER, 2002, 14 (34) :7853-7864
[2]   SURFACE CORE-LEVEL SHIFTS OF TA(110) AND W(110) VERSUS ALKALI-METAL-ATOM COVERAGE - IMPLICATIONS FOR THE ALKALI-METAL SUBSTRATE INTERACTION [J].
ANDREWS, AB ;
RIFFE, DM ;
WERTHEIM, GK .
PHYSICAL REVIEW B, 1994, 49 (12) :8396-8401
[3]   SURFACE CORE-LEVEL SHIFTS FOR PT SINGLE-CRYSTAL SURFACES [J].
BAETZOLD, RC ;
APAI, G ;
SHUSTOROVICH, E ;
JAEGER, R .
PHYSICAL REVIEW B, 1982, 26 (08) :4022-4027
[4]   The (1x1)→hexagonal structural transition on Pt(100) studied by high-energy resolution core level photoemission [J].
Baraldi, Alessandro ;
Vesselli, Erik ;
Bianchettin, Laura ;
Comelli, Giovanni ;
Lizzit, Silvano ;
Petaccia, Luca ;
de Gironcoli, Stefano ;
Locatelli, Andrea ;
Mentes, T. Onur ;
Aballe, Lucia ;
Weissenrieder, Jonas ;
Andersen, Jesper N. .
JOURNAL OF CHEMICAL PHYSICS, 2007, 127 (16)
[5]   Structure and chemical reactivity of transition metal surfaces as probed by synchrotron radiation core level photoelectron spectroscopy [J].
Baraldi, Alessandro .
JOURNAL OF PHYSICS-CONDENSED MATTER, 2008, 20 (09)
[6]   EXPERIMENTAL-STUDY OF THE GROWTH AND DISSOLUTION OF RE/W(110) BY CORE LEVEL PHOTOEMISSION SPECTROSCOPY - FORMATION OF A SURFACE ALLOY [J].
BARRETT, NT ;
VILLETTE, B ;
SENHAJI, A ;
GUILLOT, C ;
BELKHOU, R ;
TREGLIA, G ;
LEGRAND, B .
SURFACE SCIENCE, 1993, 286 (1-2) :150-167
[7]   MIGRATION OF PLATINUM ADATOM CLUSTERS ON TUNGSTEN (110) SURFACES [J].
BASSETT, DW .
JOURNAL OF PHYSICS C-SOLID STATE PHYSICS, 1976, 9 (13) :2491-2503
[9]   CHEMISORPTION OF ULTRATHIN PD LAYERS ON W(110) AND W(100) - ADSORPTION OF H-2 AND CO [J].
BERLOWITZ, PJ ;
GOODMAN, DW .
LANGMUIR, 1988, 4 (05) :1091-1095
[10]   THE ADSORPTION OF H-2 AND CO ON STRAINED NI OVERLAYERS ON W(110) AND W(100) [J].
BERLOWITZ, PJ ;
GOODMAN, DW .
SURFACE SCIENCE, 1987, 187 (2-3) :463-480