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Nanostructures & Spectroscopie
(85) Production(s) de l'année 2018
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Introduction to vibrational spectroscopies
Auteur(s): Bantignies J.-L.
Conférence invité: French-Brazilian spring school on ‘‘Raman spectroscopy of carbon nanomaterials’’ (Montpellier, FR, 2018-04-17)
Résumé: Introduction to vibrational spectroscopies
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Enhancing the Infrared Response of Carbon Nanotubes From Dye Interactions, Chemontubes 
Auteur(s): Bantignies J.-L. , Alvarez L., Belhboub A., Hermet P., Le Parc R.
Conference: CHEMONTUBES (Biarritz, FR, 2018-04-23)
Ref HAL: hal-01949731_v1
Exporter : BibTex | endNote
Résumé: Middle infrared response on a carbon nanotube is very weak because this homonuclear allotrope of carbon does not bear permanent dipoles. Nevertheless, a significant number of infrared phonons are predicted by the group theory. Encapsulating molecules inside nanotubes (called hybrid nanotubes in the following) is a common strategy to add new functionalities. The one-dimensional nature of single-walled carbon nanotubes (SWCNT) internal channels has been exploited here to induce a molecular order and specific interactions which are dependent of the size of the nano container (figure).Here we report the discovery of a strong dependence on the infrared response of the hybrid nanotube due to confinement effect when dimethylquaterthiophenes are encapsulated inside SWCNTs1. Results are compared to experiments performed on nanotubes where dyes are π-stacked at the outer surface. Surprisingly, the confinement properties lead to an exaltation of the infrared absorption response in the carbon nanotubes from dye molecule interactions. Thanks to the comparison between the experimental investigations and DFT calculations, we elucidate the origin of the large enhancement of this infrared absorption and demonstrate that interactions between conjugated oligomers and nanotubes can be probed.
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Introduction à la spectroscopie EXAFS
Auteur(s): Bantignies J.-L.
Conférence invité: Ecole d'initiation à la spectroscopie d'absorption des rayons X (Montpellier, FR, 2018-06-11)
Résumé: Introduction à la spectroscopie EXAFS
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pi conjugated oligomer encapsulation into single-walled carbon nanotubes
Auteur(s): Alvarez L.
Conference: Discussion Lavoissier Adsorption and Confinement Effects of Molecules in/on Nanotubes (Paris, FR, 2018-06-20)
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« Introduction aux spectroscopies vibrationnelles infrarouge et Raman »
Auteur(s): Bantignies J.-L.
Conférence invité: Rencontre PAC chimie Balard (Montpellier, FR, 2018-09-13)
Résumé: « Introduction aux spectroscopies vibrationnelles infrarouge et Raman »
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Study of the influence of nonlinear parameters on the efficiency of resistive field grading tube for cable termination
Auteur(s): Boucher Sarah, Chambard R., Hassanzadeh M., Castellon Jérôme, Metz R.
(Article) Publié:
Ieee Transactions On Dielectrics And Electrical Insulation, vol. p.2413 (2018)
Ref HAL: hal-01948521_v1
DOI: 10.1109/TDEI.2018.007329
WoS: 000452434500045
Exporter : BibTex | endNote
2 Citations
Résumé: The aim of this paper is to investigate the influence of nonlinear parameters (threshold field, low field conductivity and nonlinearity coefficient) on the performance of a cable termination equipped with a resistive field grading tube in 50 Hz and impulse voltage. The electrical field distribution over the insulator silicone housing surface was computed and analyzed using a finite element software (Flux 2D). Comparative studies between linear field grading (r = 2.9 and 16) and nonlinear resistive field grading (12 < r < 19) show that better effectiveness is achieved with a low threshold field and a high permittivity under 50 Hz and a high nonlinearity coefficient under impulse voltage.
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