Terahertz Spectroscopy of Single-Walled Carbon Nanotubes in a Polymer Film: Observation of Low-Frequency Phonons

被引：25

作者：

Kumar, Sunil ^{[1
,2
]}

Kamaraju, N. ^{[1
,2
]}

Karthikeyan, B. ^{[1
,2
]}

Tondusson, M. ^{[3
]}

Freysz, E. ^{[3
]}

Sood, A. K. ^{[1
,2
]}

机构：

[1] Indian Inst Sci, Dept Phys, Bangalore 560012, Karnataka, India

[2] Indian Inst Sci, Ctr Ultrafast Laser Applicat, Bangalore 560012, Karnataka, India

[3] Univ Bordeaux 1, CNRS, CPMOH, UMR 5798, F-33405 Talence, France

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2010年 / 114卷 / 29期

关键词：

LONGITUDINAL ACOUSTICAL VIBRATIONS; RAMAN; THZ; SPECTRA; POLYETHYLENE; MODES;

D O I：

10.1021/jp103105h

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：

We investigate the dielectric response of single-walled carbon nanotubes dispersed in poly(vinyl alcohol) matrix by using terahertz time domain spectroscopy. Frequency-dependent real and imaginary parts of the complex dielectric function are measured experimentally in the terahertz regime. The low-frequency phonons of carbon nanotubes, though predicted theoretically, are directly observed for the first time at frequencies 0.26, 0.60, and 0.85 THz. Further, a broad resonance is observed at 1.15 THz associated with the longitudinal acoustic mode of vibration of straight-chain segments of the long polymeric molecules in the film. The latter is observed at 1.24 THz for a pristine polymer film and has been used to derive the size of crystalline lamellae in the film.

引用

收藏

页码：12446 / 12450

页数：5

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