Width distribution of nanowires grown by step decoration

被引:35
作者
Petrovykh, DY
Himpsel, FJ
Jung, T
机构
[1] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA
[2] Paul Scherrer Inst, Lab Micro & Nanostruct, CH-5232 Villigen, Switzerland
基金
美国国家科学基金会;
关键词
copper; models of surface kinetics; molybdenum; scanning tunneling microscopy; self-assembly; stepped single crystal surfaces; surface diffusion; surface thermodynamics;
D O I
10.1016/S0039-6028(98)00175-7
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 homogeneity of Cu nanowires on a stepped Mo(110) surface is determined from scanning tunneling microscopy images via semi-automatic pattern recognition. The width distribution along a wire is close to a Poisson distribution when measured in units of atomic rows N. The standard deviation sigma follows the relation sigma approximate to 1.3 root[N]. The average wire width [N] is proportional to the terrace width for growth at similar to 500 degrees C, and independent of the terrace width when growing at similar to 600 degrees C and higher, where Cu atoms diffuse across step edges. Possible driving forces for the equilibration of the wire width are discussed, such as edge strain minimization, electrostatic step-step interactions and electronic quantum size effects. (C) 1998 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:189 / 199
页数:11
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