Radial Corrugations of Multi-Walled Carbon Nanotubes Driven by Inter-Wall Nonbonding Interactions

被引:14
作者
Huang, Xu [1 ]
Liang, Wentao [1 ]
Zhang, Sulin [1 ]
机构
[1] Penn State Univ, Dept Engn Sci & Mech, University Pk, PA 16802 USA
来源
NANOSCALE RESEARCH LETTERS | 2011年 / 6卷
基金
美国国家科学基金会;
关键词
FINITE DEFORMATION MEMBRANE; MECHANICS; ORDER; INSTABILITIES; NANOMECHANICS; STRENGTH; FRACTURE; TUBES;
D O I
10.1007/s11671-010-9801-0
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
We perform large-scale quasi-continuum simulations to determine the stable cross-sectional configurations of free-standing multi-walled carbon nanotubes (MWCNTs). We show that at an inter-wall spacing larger than the equilibrium distance set by the inter-wall van der Waals (vdW) interactions, the initial circular cross-sections of the MWCNTs are transformed into symmetric polygonal shapes or asymmetric water-drop-like shapes. Our simulations also show that removing several innermost walls causes even more drastic cross-sectional polygonization of the MWCNTs. The predicted cross-sectional configurations agree with prior experimental observations. We attribute the radial corrugations to the compressive stresses induced by the excessive inter-wall vdW energy release of the MWCNTs. The stable cross-sectional configurations provide fundamental guidance to the design of single MWCNT-based devices and shed lights on the mechanical control of electrical properties.
引用
收藏
页码:1 / 6
页数:6
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