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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