Thermodynamic driving forces governing assembly of disilicide nanowires

被引：7
作者：
Shinde, Aniketa [1 ,2 ]
Wu, Ruqian [2 ]
Ragan, Regina [1 ]
机构：
[1] Univ Calif Irvine, Dept Chem Engn & Mat Sci, Irvine, CA 92697 USA
[2] Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA
来源：
SURFACE SCIENCE | 2010年 / 604卷 / 17-18期
基金：
美国国家科学基金会;
关键词：
Scanning probe microscopy; Ab initio calculations; Rare earth disilicide; Metal nanowires; Self assembly; RARE-EARTH SILICIDE; SCANNING-TUNNELING-MICROSCOPY; ELECTRONIC-STRUCTURE; GROWTH; SI(001); ARRAYS; STM; RECONSTRUCTIONS; NANOSTRUCTURES; EVOLUTION;
D O I：
10.1016/j.susc.2010.05.012
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：
Driving forces are investigated for assembling low dimensional, metallic, erbium and dysprosium disilicide nanowires on Si(001), using both scanning probe microscopy and density functional theory. Side-by-side comparison between emulated and measured scanning tunneling microscopy images allows establishment of reliable atomic models for complex adatom surface reconstructions of Er/Si(001) and Dy/Si(001) that are precursors to high aspect ratio disilicide nanowires. Peculiar surface reconstructions and relaxation of Si bonds are identified as the key factors for nucleation of these disilicide nanowires in parallel arrays on vicinal Si(001). Stable nanowire widths and heights are calculated with predicted atomic models that are consistent with experimental observations. A clear understanding of the nanowire-substrate interface is determined by correlating adatom reconstruction patterns with nanowire formation that is imperative to the development of unique procedures for massive fabrication of monodisperse nanosystems. (C) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码：1481 / 1486
页数：6
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