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Picheau, E., Impellizzeri, A., Rybkovskiy, D., Bayle, M., Mevellec, J.-Y., Hof, F., Saadaoui, H., Noé, L., Torres Dias, A. C., Duvail, J.-L., Monthioux, M., Humbert, B., Puech, P., Ewels, C. P. & Pénicaud, A. (2021) Intense Raman D Band without Disorder in Flattened Carbon Nanotubes. ACS Nano, 15 596–603.
Added by: Richard Baschera (2021-03-05 10:42:19) Last edited by: Richard Baschera (2021-03-05 10:47:00) |
| Type de référence: Article DOI: 10.1021/acsnano.0c06048 Numéro d'identification (ISBN etc.): 1936-0851 Clé BibTeX: Picheau2021 Voir tous les détails bibliographiques  |
Catégories: IMN, INTERNATIONAL, PMN Créateurs: Bayle, Duvail, Ewels, Hof, Humbert, Impellizzeri, Mevellec, Monthioux, Noé, Pénicaud, Picheau, Puech, Rybkovskiy, Saadaoui, Torres Dias Collection: ACS Nano |
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| Liens URLs https://doi.org/10.1021/acsnano.0c06048 |
| Résumé |
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Above a critical diameter, single- or few-walled carbon nanotubes spontaneously collapse as flattened carbon nanotubes. Raman spectra of isolated flattened and cylindrical carbon nanotubes have been recorded. The collapse provokes an intense and narrow D band, despite the absence of any lattice disorder. The curvature change near the edge cavities activates a D band, despite framework continuity. Theoretical calculations based on Placzek approximation fully corroborate this experimental finding. Usually used as a tool to quantify defect density in graphenic structures, the D band cannot be used as such in the presence of a graphene fold. This conclusion should serve as a basis to revisit materials comprising structural distortion where poor carbon organization was concluded on a Raman basis. Our finding also emphasizes the different visions of a defect between chemists and physicists, a possible source of confusion for researchers working in nanotechnologies.
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Publisher: American Chemical Society
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