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Characterisation of carbon nano-onions using Raman spectroscopy

Roy, D and Chhowalla, M and Wang, H and Sano, N and Alexandrou, I and Clyne, TW and Amaratunga, GAJ (2003) Characterisation of carbon nano-onions using Raman spectroscopy. Chemical Physics Letters, 373. pp. 52-56. ISSN 0009-2614

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Abstract

Characteristics of the Raman spectrum from carbon onions have been identified in terms of the position of the G peak and appearance of the transverse optic phonon peaks. Five new peaks were observed in the low wavenumber region, at about 1100, 861, 700, 450 and 250 cm(-1). The origins of these peaks are discussed in terms of the phonon density of states (PDOS) and phonon dispersion curves of graphite. The curvature of the graphene planes is invoked to explain the relaxation of the Raman selection rules and the appearance of the new peaks. The Raman spectrum of carbon onions is compared with that of highly oriented pyrolytic graphite (HOPG). The strain of graphene planes due to curvature has been estimated analytically and is used to account for the downward shift of the G peak. (C) 2003 Elsevier Science B.V. All rights reserved.

Item Type: Article
Uncontrolled Keywords: model thin-films nanotubes graphite water spectrum nitride scattering diamond
Subjects: UNSPECIFIED
Divisions: Div B > Electronics, Power & Energy Conversion
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 11:24
Last Modified: 14 Jul 2014 01:07
DOI: 10.1016/S0009-2614(03)00523-2

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