First-principles studies of the √7 x √7R19.1° structure of sulfur on the Pd(111) surface

被引：12

作者：

Alfonso, Dominic R.

机构：

[1] US DOE, Natl Energy Technol Lab, Pittsburgh, PA 15236 USA

[2] Parsons, South Pk, PA 15129 USA

来源：

SURFACE SCIENCE | 2007年 / 601卷 / 21期

关键词：

density functional theory calculations; sulfur; palladium; metallic surfaces; surface structure;

D O I：

10.1016/j.susc.2007.08.016

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：

Density functional theory is used to investigate the (root/7 x root 7)R19.1 degrees structure of sulfur on the Pd(111) surface. Among the different models that were considered, the densely packed mixed sulfur-metal overlayer structure proposed by Liu et al. [W. Liu, K.A.R. Mitchell, W. Berndt, Surf. Sci. 393 (1997) L119] was found to be the most energetically favorable. This model consists of arrangement of Pd triangles and pentagons on top of Pd(111) with the sulfur atoms at 3/7 monolayer coverage. The dominant mechanism for sulfur interaction with Pd in the overlayer region is the rehybridization of sulfur 3p and metal 4d bands. Simulated scanning tunneling rnicroscopy image for this structure shows some similarity with that obtained from experiment. Our study confirms that surface sulfide with no structural resemblance to its bulk counterparts can form on Pd(111). (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：4899 / 4909

页数：11

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