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Article Dans Une Revue Journal of Physical Chemistry C Année : 2010

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

Résumé

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.
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Dates et versions

hal-00506063 , version 1 (27-07-2010)

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Sunil Kumar, N. Kamaraju, B. Karthikeyan, Marc Tondusson, Eric Freysz, et al.. Terahertz Spectroscopy of Single-Walled Carbon Nanotubes in a Polymer Film: Observation of Low-Frequency Phonons. Journal of Physical Chemistry C, 2010, 114 (29), pp.12446-12450. ⟨10.1021/jp103105h⟩. ⟨hal-00506063⟩

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