Radial elasticity of multiwalled carbon nanotubes

被引：149
|
作者：
Palaci, I
Fedrigo, S
Brune, H
Klinke, C
Chen, M
Riedo, E
机构：
[1] Georgia Inst Technol, Sch Phys, Atlanta, GA 30332 USA
[2] Ecole Polytech Fed Lausanne, Inst Phys Nanostruct, CH-1015 Lausanne, Switzerland
[3] IBM Corp, Thomas J Watson Res Ctr, Yorktown Hts, NY 10598 USA
来源：
PHYSICAL REVIEW LETTERS | 2005年 / 94卷 / 17期
关键词：
D O I：
10.1103/PhysRevLett.94.175502
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We report an experimental and a theoretical study of the radial elasticity of multiwalled carbon nanotubes as a function of external radius. We use atomic force microscopy and apply small indentation amplitudes in order to stay in the linear elasticity regime. The number of layers for a given tube radius is inferred from transmission electron microscopy, revealing constant ratios of external to internal radii. This enables a comparison with molecular dynamics results, which also shed some light onto the applicability of Hertz theory in this context. Using this theory, we find a radial Young modulus strongly decreasing with increasing radius and reaching an asymptotic value of 30 +/- 10 GPa.
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页数：4
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