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Article Dans Une Revue ACS Nano Année : 2021

Intense Raman D band without disorder in flattened carbon nanotubes

Emmanuel Picheau
Maxime Bayle
Jean Yves Mevellec
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Ferdinand Hof
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Laure Noé
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  • IdHAL : laure-noe
Bernard Humbert
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Résumé

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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Dates et versions

hal-03091189 , version 1 (16-08-2022)

Identifiants

Citer

Emmanuel Picheau, Anthony Impellizzeri, Dmitry V. Rybkovskiy, Maxime Bayle, Jean Yves Mevellec, et al.. Intense Raman D band without disorder in flattened carbon nanotubes. ACS Nano, 2021, 15 (1), pp.596-603. ⟨10.1021/acsnano.0c06048⟩. ⟨hal-03091189⟩
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