The composition-dependent mechanical properties of Ge/Si core-shell nanowires

被引：20
|
作者：
Liu, X. W. [1 ]
Hu, J. [1 ]
Pan, B. C. [1 ]
机构：
[1] Univ Sci & Technol China, Dept Phys, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Anhui, Peoples R China
来源：
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES | 2008年 / 40卷 / 10期
关键词：
nanowires; mechanical properties; calculation;
D O I：
10.1016/j.physe.2008.03.011
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The Stillinger-Weber potential is used to study the composition-dependent Young's modulus for Ge-core/Si-shell and Si-core/Ge-shell nanowires. Here, the composition is defined as a ratio of the number of atoms of the core to the number of atoms of a core-shell nanowire. For each concerned Ge-core/Si-shell nanowire with a specified diameter, we find that its Young's modulus increases to a maximal value and then decreases as the composition increases. Whereas Young's modulus of the Si-core/Ge-shell nanowires increase nonlinearly in a wide compositional range. Our calculations reveal that these observed trends of Young's modulus of core-shell nanowires are essentially attributed to the different components of the cores and the shells, as well Lis the different strains in the interfaces between the cores and the shells. (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码：3042 / 3048
页数：7
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