Raman spectroscopy of nondispersive intermediate frequency modes and their overtones in carbon nanotubes

被引：3

作者：

Tyborski, Christoph ^{[1
]}

Herziger, Felix ^{[1
]}

Maultzsch, Janina ^{[1
]}

机构：

[1] Inst Festkorperphys, D-10623 Berlin, Germany

来源：

PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS | 2015年 / 252卷 / 11期

基金：

欧洲研究理事会;

关键词：

carbon nanotubes; IFM; overtones; Raman spectroscopy; SPECTRA; FLAVIN;

D O I：

10.1002/pssb.201552513

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We performed resonance Raman spectroscopy on HiPCO-produced single-walled carbon nanotubes in the spectral region of 846 and 1692 cm(-1), using laser excitation energies between 1.58 and 2.73 eV. We observe a characteristic peak around 846 cm-1 and its overtones around 1692 cm-1. Especially the latter was controversially discussed in the past and has been assigned to a double-resonant Raman process involving two oTO phonons. We demonstrate that both peaks slightly depend on the excitation laser energy by means of their shape, intensity, and peak position. Following the model proposed by Dobardzic et al., we relate both peaks to oTO Gamma-point phonons. As we analyze both, the first-order band and its overtone simultaneously, we are able to provide a unified explanation of these low-intensity Raman bands in carbon nanotubes. [GRAPHICS] (C) 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

引用

页码：2551 / 2557

页数：7

共 33 条

[1]

Brar VW, 2002, PHYS REV B, V66, DOI 10.1103/PhysRevB.66.155418

[2]

Cardona M., 1982, TOPICS APPL PHYS, V50

[3] Finite length effects in DNA-wrapped carbon nanotubes [J].