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Initial stages of Pd deposition on Au(110): A STM, LEED and AES study
被引:21
作者:
Robach, Y
[1
]
Abel, M
Porte, L
机构:
[1] Ecole Cent Lyon, UMR CNRS 5512, Lab Elect Optoelect & Microsyst, F-69134 Ecully, France
[2] Univ Aix Marseille 3, UMR CNRS 6137, Fac Sci St Jerome, F-13397 Marseille 20, France
关键词:
alloys;
scanning tunneling microscopy;
growth;
low index single crystal surfaces;
palladium;
gold;
surface structure;
morphology;
roughness;
and topography;
D O I:
10.1016/S0039-6028(02)02690-0
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:
Thin Pd films deposited on the missing row (MR) reconstructed Au(1 1 0)-(1 x 2) surface have been studied using scanning tunneling microscopy, low energy electron diffraction and Auger electron spectroscopy. In the first step of Pd deposition, Pd adatoms fill in the MRs of the Au reconstructed surface and are next covered by Au atoms. This Au surface segregation leaves one-dimensional holes on the surface, and a mixed Au-Pd interface is thus formed. With increasing Pd coverage, a Pd layer grows pseudomorphically onto the mixed interface in a two-dimensional mode up to 2-3 ML. Then, beyond 4 ML, 3D anisotropic islands elongated in the [1 (1) over bar 0] direction are grown. The formation of the alloyed phase, then the 3D island growth both contribute to relax tensile strain between Pd overlayers and Au substrate. (C) 2002 Elsevier Science B.V. All rights reserved.
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页码:248 / 256
页数:9
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