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Excitation energy dependence of Raman bands in multiwalled carbon nanotubes

Biomedical Sciences Research Institute Computer Science Research Institute Environmental Sciences Research Institute Nanotechnology & Advanced Materials Research Institute

Soin, N, Roy, SS, Ray, SC and McLaughlin, JAD (2010) Excitation energy dependence of Raman bands in multiwalled carbon nanotubes. JOURNAL OF RAMAN SPECTROSCOPY, 41 (10). pp. 1227-1233. [Journal article]

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DOI: 10.1002/jrs.2594

Abstract

Vertically aligned multiwalled carbon nanotubes (MWCNTs) were grown on 1- and 3-nm cobalt (Co) films, at various growth times by microwave plasma enhanced chemical vapor deposition technique and their microstructural properties were analyzed with the help of Raman spectra that were obtained from different sources of laser excitation energies (E-L: 2.41, 1.96 and 1.58 eV). The variation of D and G band positions in MWCNTs grown on 1- and 3-nm Co films follows a similar behavior, and an anomalous behavior was observed in the E-L dependence of the D'-band wavenumber. In the second-order spectra, the G' band varied strongly according to structure with the laser excitation energy (E-L). The I-D/I-G ratio decreased with the increase of E-L for all MWCNTs; however, for a fixed E-L, the I-D/I-G dispersion is higher at lower E-L. The crystallite sizes were estimated using IDIG and E-L. We have shown that, for all MWCNTs, I-D/I-G ratio is inversely proportional to E-L(4). Copyright (C) 2010 John Wiley & Sons, Ltd.

Item Type:Journal article
Keywords:carbon nanotubes; Raman spectra; excitation energy
Faculties and Schools:Faculty of Computing & Engineering
Faculty of Computing & Engineering > School of Engineering
Research Institutes and Groups:Engineering Research Institute
Engineering Research Institute > Nanotechnology & Integrated BioEngineering Centre (NIBEC)
ID Code:18908
Deposited By:Mrs Ann Blair
Deposited On:19 Jul 2011 08:49
Last Modified:19 Jul 2011 08:49

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