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Polarization Effects of Transversal and Longitudinal Optical Phonons in Bundles of Multiwall Carbon Nanotubes

Ripanti, Francesca ; D'Acunto, Giulio LU ; Betti, Maria Grazia ; Mariani, Carlo ; Bittencourt, Carla and Postorino, Paolo (2019) In Journal of Physical Chemistry C 123.
Abstract
We report on the polarization analysis of the Raman spectrum of highly vertically aligned multiwall carbon nanotubes (MWCNTs). A simple model considering the average angle distribution across the MWCNT axes accounts for the observed angular dependent Raman mode intensity. The model fully fits the experimental data, allowing to derive an average waving angle of ∼37° around the MWCNT axes and explaining the apparent discrepancy of previous experiments reported in the literature. Furthermore, we can distinguish two components in the Raman G band, associated to the longitudinal and transversal optical modes. Their intensity dependence as a function of polarization clearly suggests the metallic nature of these MWCNTs, experimentally verified by... (More)
We report on the polarization analysis of the Raman spectrum of highly vertically aligned multiwall carbon nanotubes (MWCNTs). A simple model considering the average angle distribution across the MWCNT axes accounts for the observed angular dependent Raman mode intensity. The model fully fits the experimental data, allowing to derive an average waving angle of ∼37° around the MWCNT axes and explaining the apparent discrepancy of previous experiments reported in the literature. Furthermore, we can distinguish two components in the Raman G band, associated to the longitudinal and transversal optical modes. Their intensity dependence as a function of polarization clearly suggests the metallic nature of these MWCNTs, experimentally verified by the valence band photoemission analysis. The present study provides a simple, effective spectroscopic method to determine physicochemical and specific morphological characteristics of carbon nanotubes. (Less)
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author
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publishing date
type
Contribution to journal
publication status
published
in
Journal of Physical Chemistry C
volume
123
publisher
The American Chemical Society (ACS)
external identifiers
  • scopus:85071732053
ISSN
1932-7447
DOI
10.1021/acs.jpcc.9b02638
language
English
LU publication?
no
id
c1ed037a-e12e-4ff6-a0bd-a15d2800cc3c
date added to LUP
2022-05-05 14:51:05
date last changed
2022-05-11 17:20:40
@article{c1ed037a-e12e-4ff6-a0bd-a15d2800cc3c,
  abstract     = {{We report on the polarization analysis of the Raman spectrum of highly vertically aligned multiwall carbon nanotubes (MWCNTs). A simple model considering the average angle distribution across the MWCNT axes accounts for the observed angular dependent Raman mode intensity. The model fully fits the experimental data, allowing to derive an average waving angle of ∼37° around the MWCNT axes and explaining the apparent discrepancy of previous experiments reported in the literature. Furthermore, we can distinguish two components in the Raman G band, associated to the longitudinal and transversal optical modes. Their intensity dependence as a function of polarization clearly suggests the metallic nature of these MWCNTs, experimentally verified by the valence band photoemission analysis. The present study provides a simple, effective spectroscopic method to determine physicochemical and specific morphological characteristics of carbon nanotubes.}},
  author       = {{Ripanti, Francesca and D'Acunto, Giulio and Betti, Maria Grazia and Mariani, Carlo and Bittencourt, Carla and Postorino, Paolo}},
  issn         = {{1932-7447}},
  language     = {{eng}},
  month        = {{07}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{Journal of Physical Chemistry C}},
  title        = {{Polarization Effects of Transversal and Longitudinal Optical Phonons in Bundles of Multiwall Carbon Nanotubes}},
  url          = {{http://dx.doi.org/10.1021/acs.jpcc.9b02638}},
  doi          = {{10.1021/acs.jpcc.9b02638}},
  volume       = {{123}},
  year         = {{2019}},
}