Chiral Index Dependence of the G+ and G- Raman Modes in Semiconducting Carbon Nanotubes

被引：75

作者：

Telg, Hagen ^{[1
]}

Duque, Juan G. ^{[1
,5
]}

Staiger, Matthias ^{[2
]}

Tu, Xiaomin ^{[3
]}

Hennrich, Frank ^{[4
]}

Kappes, Manfred M. ^{[4
]}

Zheng, Ming ^{[3
]}

Maultzsch, Janina ^{[2
]}

Thomsen, Christian ^{[2
]}

Doorn, Stephen K. ^{[1
]}

机构：

[1] Los Alamos Natl Lab, Ctr Integrated Nanotechnol, Los Alamos, NM 87545 USA

[2] Tech Univ Berlin, Inst Festkorperphys, D-10623 Berlin, Germany

[3] Natl Inst Stand & Technol, Div Polymers, Gaithersburg, MD 20899 USA

[4] Karlsruher Inst Technol, Inst Nanotechnol, D-76021 Karlsruhe, Germany

[5] Los Alamos Natl Lab, Div Chem, Phys Chem & Appl Spect C PCS, Los Alamos, NM 87545 USA

来源：

ACS NANO | 2012年 / 6卷 / 01期

基金：

欧洲研究理事会;

关键词：

single-wall carbon nanotubes; Raman spectroscopy; G mode; LO/TO phonons; diameter determination; (n; m); assignment; SINGLE-WALL; SPECTROSCOPY; SCATTERING; SYMMETRY; GRAPHITE;

D O I：

10.1021/nn2044356

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Raman spectroscopy on the radial breathing mode Is a common tool to determine the diameter d or chiral indices (n,m) of single-wall carbon nanotubes. In this work we present an alternative technique to determine d and (n,m) based on the high-energy G(-) mode. From resonant Raman scattering experiments on 14 highly purified single chirality (n,m) samples we obtain the diameter, chiral angle, and family dependence of the G(-) and G(+) peak position. Considering theoretical predictions we discuss the origin of these dependences with respect to rehybridization of the carbon orbitals, confinement, and electron-electron interactions. The relative Raman intensities of the two peaks have a systematic chiral angle dependence in agreement with theories considering the symmetry of nanotubes and the associated phonons.

引用

页码：904 / 911

页数：8

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