期刊
SURFACE SCIENCE
卷 663, 期 -, 页码 1-10出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.susc.2017.03.015
关键词
Zn-deposited Cu(111); Surface alloy; Photoelectron spectroscopy; Density functional theory; Work function
资金
- Advanced-Catalytic-Transformation program for Carbon utilization (ACT-C) of the Japan Science and Technology Agency (JST) [JPMJCR12YU]
- Japan Society for the Promotion of Science (JSPS) [26105004]
- Photon Factory Program Advisory Committee [2012S2-006, 2015S2-008]
- Grants-in-Aid for Scientific Research [26105001, 15K21719] Funding Source: KAKEN
Electronic states and growth modes of the Zn-deposited Cu(111) surface at 300 K were quantitatively studied using core-level and valence photoelectron spectroscopies. Both Cu 2p and Zn 2p core-levels shifted to higher binding energy with increasing the amount of deposited Zn up to multilayer. The origin of the core-level shift of Cu 2p was further investigated by density functional theory calculations; the shift of the Cu 2p peak results from the change in the effective electrostatic potential (initial state effect) caused by the formation of Zn-Cu surface alloy, and the increase of coordination numbers of surface Cu atoms by Zn overlayer. The observed valence photoelectron spectra show the formation of the two atomic-layer Zn-Cu alloy up to the Zn coverage of 1 ML, followed by the formation of three-dimensional Zn islands on the alloyed surface at 300 K.
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