Chirality-Dependent Raman Frequency Variation of Single-Walled Carbon Nanotubes under Uniaxial Strain

被引：44

作者：

Gao, Bo ^{[1
]}

Jiang, Lai ^{[1
]}

Ling, Xi ^{[1
]}

Zhang, Jin ^{[1
]}

Liu, Zhongfan ^{[1
]}

机构：

[1] Peking Univ, BNLMS,Coll Chem & Mol Engn, Key Lab Phys & Chem Nanodevices, State Key Lab Struct Chem Unstable & Stable Speci, Beijing 100871, Peoples R China

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2008年 / 112卷 / 51期

关键词：

D O I：

10.1021/jp809374j

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：

By using a homemade setup, the length of uniaxial strained single-walled carbon nanotubes (SWNTs) was directly measured by scanning electron microscopy (SEM), and quantitative relations between uniaxial strain and Raman frequency were obtained. It was found that RBM frequency was not affected, but G-band frequency variation was diameter and chirality-dependent under uniaxial strain. The G-band frequency shift rate increased with diameter increasing and chiral angel decreasing. Also G(+) and G(-) frequency shift rates were related to chiral angle due to chirality-dependent C-C bonds elongation. A surprising finding that intermediate frequency mode (IFM) frequency upshifted with uniaxial strain increasing indicates that lattice transformation needs to be considered in phonon properties under uniaxial strain. These studies provide valuable information about geometric structure variation of SWNTs under uniaxial strain.

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页码：20123 / 20125

页数：3

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