Polarization Effects of Transversal and Longitudinal Optical Phonons in Bundles of Multiwall Carbon Nanotubes
(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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/c1ed037a-e12e-4ff6-a0bd-a15d2800cc3c
- author
- Ripanti, Francesca ; D'Acunto, Giulio LU ; Betti, Maria Grazia ; Mariani, Carlo ; Bittencourt, Carla and Postorino, Paolo
- publishing date
- 2019-07-17
- 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}}, }