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(89) Production(s) de ALVAREZ L.
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Helicites sorting of single-walled carbon nanotubes by amphiphiles molecules adsorption studied by resonant raman excitation profiles
Auteur(s): Alvarez L.
(Affiches/Poster)
International winter school on electronic properties of novel materials (Kirchberg, AU), 2009-03-07
Résumé: Adsorption of specifically designed polyaromatic amphiphiles were used to sort HiPCo single-walled carbon nanotubes (SWNTs) with different helicities. The sorting is investigated by resonant Raman excitation profiles. Chiral indexes (n and m) of SWNTs present in our samples are determined by fitting the Ra-man peaks observed in the radial breathing modes region (RBM). Scanning over an excitation energy range between 2 and 2.2 eV with a 0.01 eV step allows to investigate mainly two families of metallic nanotubes (2n+m=24 and 2n+m=27). The transition en-ergies of nanotubes measured from the Raman spectra differ from the calculated ones, leading to useful corrections of the Kataura plot. The results also display significant differences between the sorted and the reference samples, meaning that discrimination between SWNTs of different properties is possible.
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X-ray absorption spectroscopy on modified carbon nanotubes
Auteur(s): Alvarez L.
(Séminaires)
Hanoi (Hanoi, VN), 2008-12-17 |
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Supramolecular discrimination of carbon nanotubes according to their helicity 
Auteur(s): Marquis R., Greco C., Sadokierska I., Lebedkin S., Kappes M. M., Michel T., Alvarez L., Sauvajol J.-L., Meunier S., Mioskowski C.
(Article) Publié:
Micro & Nano Letters, vol. 8 p.1830-1835 (2008)
Ref HAL: hal-00496385_v1
PMID 18540661
DOI: 10.1021/nl0803141
WoS: 000257504500009
Exporter : BibTex | endNote
75 Citations
Résumé: Adsorption of specifically designed and geometrically constrained polyaromatic amphiphiles on single-walled carbon nanotubes (SWNTs) was found to be selective of the nanotube helicity angle. Starting from the same SWNT mixture, photoluminescence and resonant Raman spectroscopies show that a pentacenic-based amphiphile leads to the solubilization of armchair SWNTs and that a quaterrylene-based amphiphile leads to the solubilization of zigzag SWNTs. The results were predicted by the design of the two amphiphiles and are consistent with a supramolecular recognition of the nanotube graphene-type atomic structure by the aromatic part of the molecules through optimized pi-pi(-) stacking interactions.
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Temperature dependence and pressure dependence of the vibrational properties of corannulene
Auteur(s): Alvarez L., Le Parc R., Jourdain V., Dennler S., Bantignies J.-L., Sauvajol J.-L., Rose Jonathan A., Scott Lawrence T.
(Article) Publié:
Physica Status Solidi B, vol. 245 p.2261-2263 (2008)
Texte intégral en Openaccess : 
Ref HAL: hal-00496491_v1
DOI: 10.1002/pssb.200879611
WoS: 000260581800086
Exporter : BibTex | endNote
4 Citations
Résumé: Herein, we report the experimental investigation of the vibrational properties of corannulene using Raman spectroscopy. The temperature dependences of the Raman spectra between 300 and 20 K reveal a very high sensitivity of the low frequency domain between 40 and 200 cm(-1) compared to the intramolecular domain. The behavior of the Raman modes of the corannulene under pressure, between 0.53 GPa and 8 GPa, is also studied. Under pressure, in the intermolecular vibrational domain (<150 cm(-1)), two transitions occur suggesting metastable intermediate stages under pressure. (C) 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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Physical properties of epoxy filled carbon nanotubes composites
Auteur(s): Parret R., Leon Vincent, Bantignies J.-L., Almairac Robert, Alvarez L.
Conference: Sofcomp european workshop (Montpellier, France, FR, 2008-11-27)
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X-ray absorption spectroscopy on modified carbon nanotubes
Auteur(s): Alvarez L.
(Séminaires)
, 2008-10-29 |
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Structural Properties of Carbon Nanostructures Under High Pressure
Auteur(s): Alvarez L.
(Affiches/Poster)
XXII nd International Winterschool on Electronic Properties of Novel Materials (Kirchberg, Austria, FR), 2008-03-01 |
