Long-range surface faceting induced by chemisorption of PTCDA on stepped Ag(111) surfaces

被引：11
|
作者：
Schmitt, Stefan [1 ]
Schoell, Achim [1 ]
Umbach, Eberhard [1 ]
机构：
[1] Univ Wurzburg, Expt Phys 7, D-97074 Wurzburg, Germany
来源：
SURFACE SCIENCE | 2016年 / 643卷
关键词：
Faceting; Ag(111); PTCDA; LEED; STM; Chemisorption; SCANNING-TUNNELING-MICROSCOPY; VICINAL METAL-SURFACES; THIN-FILMS; GROWTH; AG; MORPHOLOGY; STM;
D O I：
10.1016/j.susc.2015.07.017
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：
The organic molecule PTCDA preferentially adsorbs on steps of vicinal Ag(111) surfaces and bunches them to well defined facet planes. These depend on coverage and annealing temperature and are independent of the nominal step direction and angle of inclination of the unreconstructed initial surface. We study the development of the facets and present a map of all 16 types of facets in a stereographic triangle of 35 off the [111]-direction. The faceting mechanism is interpreted as orientational phase separation originating from different bonding strengths of PTCDA on various facets. The faceting drives the system to the minimum of its surface free energy. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：59 / 64
页数：6
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