Excitation energy dependence of Raman bands in multiwalled carbon nanotubes

N Soin, SS Roy, SC Ray, JAD McLaughlin

Research output: Contribution to journalArticle

25 Citations (Scopus)

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.
LanguageEnglish
Pages1227-1233
JournalJournal of Raman Spectroscopy
Volume41
Issue number10
DOIs
Publication statusPublished - Oct 2010

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carbon nanotubes
excitation
cobalt
energy
lasers
vapor deposition
Raman spectra
microwaves

Keywords

  • carbon nanotubes
  • Raman spectra
  • excitation energy

Cite this

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title = "Excitation energy dependence of Raman bands in multiwalled carbon nanotubes",
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.",
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Excitation energy dependence of Raman bands in multiwalled carbon nanotubes. / Soin, N; Roy, SS; Ray, SC; McLaughlin, JAD.

In: Journal of Raman Spectroscopy, Vol. 41, No. 10, 10.2010, p. 1227-1233.

Research output: Contribution to journalArticle

TY - JOUR

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AU - Soin, N

AU - Roy, SS

AU - Ray, SC

AU - McLaughlin, JAD

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AB - 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.

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