Surface structure characterization of ultra-thin films of Au deposited on Pd(111)

被引：3

作者：

Pancotti, A. ^{[1
]}

de Siervo, A. ^{[2
]}

Nascente, P. A. P. ^{[3
]}

Landers, R. ^{[2
]}

机构：

[1] Univ Fed Goias, Dept Fis, Reg Jatai, BR-75801615 Jatai, Go, Brazil

[2] Univ Estadual Campinas, Inst Fis Gleb Wataghin, Dept Fis Aplicada, BR-13083859 Campinas, SP, Brazil

[3] Univ Fed Sao Carlos, Dept Engn Mat, BR-13565905 Sao Carlos, SP, Brazil

来源：

SURFACE SCIENCE | 2016年 / 648卷

基金：

巴西圣保罗研究基金会;

关键词：

Gold-palladium alloys; Bimetallic surfaces; X-ray photoelectron diffraction; Synchrotron radiation; Low-energy electron diffraction; Surface alloys; VINYL-ACETATE; ADSORPTION; ALLOYS; GOLD; PD; PHOTOEMISSION; DIFFRACTION; TRANSITION; CATALYSTS; ENSEMBLE;

D O I：

10.1016/j.susc.2015.11.008

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：

Ultra-thin films of Au were deposited on the Pd(111) surface and then characterized by X-ray photoelectron spectroscopy (XPS), low-energy electron diffraction (LEED), and X-ray photoelectron diffraction (XPD) generated by synchrotron radiation. The Au films were deposited at room temperature (300 K) and subsequently annealed at 400 degrees C (673 K) and 610 degrees C (883 K). XPD analyses indicated that the gold films were 7 and 6 ML thick, for the annealing temperatures of 400 degrees C and 610 degrees C, respectively. The film interlayer distances exhibited an oscillatory behavior, with a 5% contraction between the top and the second layers, a 3% expansion between the second and the third layers, for the film annealed at 400 degrees C, and a 2% expansion in the interlayer distance between the top and the second layers and a 4% contraction between the second and the third layers, for the film annealed at 610 degrees C For both annealing temperatures, the interlayer distances between the third and the fourth layers and between the fourth and the fifth layers exhibited a 1% expansion and a 2% contraction. For the film annealed at 610 degrees C, XPD results revealed that the Pd(111) surface was covered by Au islands, with some bare patches exposed. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：250 / 255

页数：6