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Temperature dependence of Raman scattering in filled double-walled carbon nanotubes

Sendova, Mariana and Flahaut, Emmanuel and Hartsfield, Thomas Temperature dependence of Raman scattering in filled double-walled carbon nanotubes. (2010) Journal of Applied Physics, vol. 108 (n° 4). ISSN 0021-8979

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Official URL: http://dx.doi.org/10.1063/1.3463400

Abstract

Four types of filled double-walled carbon nanotubes (DWNTs) (Se@DWNT; Te@DWNT; HgTe@DWNT; and PbI2@DWNT) have been studied by high-resolution transmission electron microscopy and micro-Raman spectroscopy in the temperature interval from 80 to 700 K employing 785 nm excitation wavelength. The temperature dependence of the dominant bands (D-band, G-band, and the (2D)-band) are analyzed in terms of the model developed by Klemens, Hart, Agraval, Lax, and Cowley and extended by Balkanski for anharmonic decay of optical phonons. The quasiharmonic frequencies and the anharmonicity constants were obtained from the temperature dependences of the analyzed Raman bands. The findings were compared to analogous study for empty DWNTs. The strength of the van der Waals interaction between the guest material and the carbon nanotube (CNT) estimated through the quasiharmonic frequencies was found to decrease in the following order: Se@DWNT; Te@DWNT; PbI2@DWNT, and HgTe@DWNT. In agreement with this, the anharmonicity due to the phonon–phonon interactions was found to decrease in the same order.

Item Type:Article
Additional Information:Thanks to AIP editor. The definitive version is available at http://www.aip.org/ The original PDF of the article can be found at Journal of Applied Physics website : http://jap.aip.org/resource/1/japiau/v108/i4/p044309_s1
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Other partners > New College of Florida (USA)
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Deposited By: Leila Abdelouhab
Deposited On:20 Jun 2011 14:44

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