Accueil >
Production scientifique
(89) Production(s) de ALVAREZ L.
|
|
Spectroscopic study of nitrogen doping of multi-walled carbon nanotubes 
Auteur(s): Enouz-vedrenne Stephane, Bantignies J.-L., Babaa Marie-rose, Alvarez L., Parent P., Le Normand F., Stephan O., Poncharal Philippe, Loiseau A., Doyle B. P.
(Article) Publié:
Journal Of Nanoscience And Nanotechnology, vol. 7 p.3524-3527 (2007)
Ref HAL: hal-00497062_v1
PMID 18330168
DOI: 10.1166/jnn.2007.839
WoS: 000250388600029
Exporter : BibTex | endNote
8 Citations
Résumé: Combined spatially resolved electron-energy loss spectroscopy (EELS) and high resolution near-edge X-ray absorption fine structure (NEXAFS) spectroscopy have been used to investigate the nitrogen doping of multi-walled carbon nanotubes (N-MWNT). EELS indicates that most of the tubes are nitrogen-doped. NEXAFS spectroscopy reveals pyridine-like and nitrile N structures. High resolution NEXAFS experiments show that the main nitrogen concentration originates from a high amount of molecular N-2 encapsulated into only a small quantity of tubes.
|
|
|
|
Structure of Doped Single Wall Carbon Nanotubes
Auteur(s): Duclaux L., Bantignies J.-L., Almairac Robert, Sauvajol J.-L., Alvarez L.
Chapître d'ouvrage: Annual Review Of Nanoresearch, vol. p.215-250 (2007)
Ref HAL: hal-00534714_v1
Exporter : BibTex | endNote
Résumé: A review of the structure of carbon nanotubes doped either by electron donors or electron acceptors is presented. The structure of doped carbon nanotubes probed by X-ray and neutron diffraction and the short range atomic arrangement by TEM and EXAFS spectroscopy were found to depend on the cristallinity and purification treatment of host SWCNTs. The modifications of 2D lattice of SWCNTs ropes induced by doping reactions are examined. The sites of insertion at the surface of bundles, in between the individual tubes or inside the tubes are discussed as a function of the type of dopant and the mode of doping, electrochemical, vapour or liquid phase. Finally, some Raman studies of alkali-doped bundled SWCNTs are reported. The striking dependence of the Raman modes under doping are explained on the basis of structural information.
|
|
|
|
NEXAFS study of multi-walled carbon nanotubes functionalization with sulfonated poly(ether ether ketone) chains
Auteur(s): Babaa Marie-rose, Bantignies J.-L., Alvarez L., Parent P., Le Normand F., Gulas M., Mane J. M., Poncharal Philippe, Doyle B. P.
(Article) Publié:
Journal Of Nanoscience And Nanotechnology, vol. 7 p.3463-3467 (2007)
Ref HAL: hal-00497067_v1
PMID 18330158
DOI: 10.1166/jnn.2007.816
WoS: 000250388600019
Exporter : BibTex | endNote
15 Citations
Résumé: Functionalization of multi-walled carbon nanotubes (MWNTs) surface by sulfonated poly (ether ether ketone) SPEEK chains using a direct attachment reaction was investigated. A two step method was performed. MWNTs were oxidized by a nitric acid treatment to generate carboxyl groups on their surface. The grafting reaction of sulfonated groups of SPEEK with carboxyl groups present on the surface of oxidized MWNTs readily proceeds by using hexane diamine as an interlinking molecule. Transmission electron microscopy (TEM) shows that tubes are wrapped by polymer chains. Near edge X-ray absorption fine structure spectroscopy (NEXAFS) at the C K-edge, 0 K-edge, and N K-edge and X-ray photoelectron spectroscopy (XPS) were used to give evidence of covalent functionalization of MWNTs by SPEEK macromolecules.
|
 |
X-Ray Absorption on Intercalated Carbon Nanotubes
Auteur(s): Alvarez L.
Conference: Eighth International Conference on the Science and Application of Nanotubes (NT07) (Ouro Preto, Brazil, FR, 2007-06-24)
|
|
Mécanismes de Croissance des Nanotubes de Carbone Monofeuillets et modification de Propriétés par Intercalation
Auteur(s): Alvarez L.
(Séminaires)
Centre National pour la Recherche Scientifique et Technique (Meknes, Maroc, FR), 2007-12-26 |
|
NEXAFS study of single and multiwalled carbon nanotubes functionalization with sulfonated poly(ether ether ketone) chains
Auteur(s): Alvarez L.
(Affiches/Poster)
NanoSoft : Nanomatériaux, Surfaces et Objets Fonctionnalisés. Ecole thématique en Nanosciences. (Roscoff, France, FR), 2007-05-21 |
|
|
|
Structural selective charge transfer in iodine-doped carbon nanotubes
Auteur(s): Michel T., Alvarez L., Sauvajol J.-L., Almairac Robert, Aznar R., Mathon O., Bantignies J.-L., Flahaut Emmanuel
(Article) Publié:
Journal Of Physics And Chemistry Of Solids, vol. vol. 67 n° 5-6. p.1190-1192 , available on http://oatao.univ-toulouse.fr/744/1/flahaut_744.pdf (2006)
Ref HAL: hal-00474864_v1
Exporter : BibTex | endNote
Résumé: We have investigated iodine intercalated carbon nanostructures by extended X-ray absorption fine structure (EXAFS) and Raman spectroscopies. We discuss here the charge transfer and the iodine–carbon interaction as a function of the carbon nanostructures (graphite, multi-walled, double-walled and single walled nanotubes). The results show that iodine is weakly adsorbed on the surface of all multi-walled nanotubes. By contrast, a charge transfer between iodine and single walled nanotubes is evidenced.
|
