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Accueil du site > Colloïdes, Verres et Nanomatériaux > Equipe : Nanostructures > Thème : Dopage, confinement et fonctionnalisation dans les nanotubes

Thème : Dopage, confinement et fonctionnalisation dans les nanotubes

The controlled tuning of carbon nanotubes physical properties constitutes one of the major challenges for the application of these materials. We aimed at modifying either the electronic or the structural properties. We explored four different directions that look particularly interesting : The first one consists in the doping of carbon nanotube with other chemical elements like boron (B) or nitrogen (N). The second one concerns the functionalization of the carbon nanotubes. Carbon nanotubes can be fonctionalized either by oxidation or by attaching covalently organic molecules via nitrenes, carbenes or radicals... The third one deals with the intercalation by alkali metals or halogens in order to induce a charge transfer between the host material and the nanotubes. The last one is the trapping of foreign species into the hollow core of nanotube that can give rise to fascinating confinement effects since the behavior of the confined phases can differ significantly from the bulk phases. Our group has been investigating for many years confinement effects of several species A (A=iodine chains, C60 molecules, conjugated polymer ...) inserted into the inner core of SWNT. The main objective is to induce an efficient coupling between the host species and the SWNT in order to modify either the electronic or the optical properties of SWNT. Indeed, the strong interaction between the enclosed specie and the SWNT cavity allows to finely tune the characteristics of the whole system.

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Nitrogen doping of carbon nanotubes

Involved researchers : J.L. Bantignies, L. Alvarez, R. Baaba Collaboration : B. Doyle - ELECTRA (Trieste, Italie), A. Loiseau - LEM, ONERA, F. Lenormand - IPCMS Strasbourg, Ph. Parent - LCPMR Orsay, O. Stéphan - LPS Orsay The electronic properties of undoped carbon nanotubes can be either semiconducting or metallic, depending on their chirality. Doping carbon nanotubes with nitrogen or boron could be a particularly interesting way for tuning their electronic properties. This has led to an increasing (...)

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Functionalization of carbon nanotubes

Involved researchers : J.L. Bantignies, M. Paillet Collaboration : J.P. Lère-Porte, F. Serein-Spirau - ICG Montpellier) Structural modification of carbon nanotubes offers the possibility to confer them new properties and to facilitate their processing and assembly. Among the large opportunities given by functionalization chemistry, we are studying the effect of covalent grafting and non-covalent stacking of optically active species on carbon nanotube walls. We are interested in the investigation and (...)

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Modeling of adsorption in/on carbon nanostructures

Introduction. During the last half of century computational physics has grown in scope and importance to a point where it became a third part of the traditional division between experimental and theoretical physics. Computer simulations second the real experiment and bring an additional insight, at the microscopic level, into the behavior exhibited by complex systems, comprised of thousands to millions of atoms and with large numbers of degrees of freedom. Currently, the computation research program (...)

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Structure and electronic properties of nanotubes in polyelectrolyte solutions

Involved researchers : F. Dragin (PhD), E. Anglaret Collaboration : A. Pénicaud (CNRS Bordeaux) and R. Martel (Dpt Chemistry, U. Montréal Nanotubes salts (charge transfer systems nanotube-alkali atoms) are soluble in polar aprotic solvents and form polyelectrolyte solutions. We studied the structure and optical properties of nanotubes in polyelectrolyte solutions. Coupled AFM and X-ray diffraction studies demonstrated that the nanotubes are essentially individual in the solutions. We showed that (...)

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Structural properties of rubidium intercalated single walled carbon nanotubes

Involved researchers : J.L. Bantignies, L. Alvarez, J.L.Sauvajol, A. Zahab, R. Aznar, E. Alibert Collaboration : F. Villain, V. Briois (SAMBA, Soleil, Saint Aubin) Alkali metal insertion into SWNT bundle is shown to lead to a significant increase of the SWNT conductivity but the structure of the intercalated phases as a function of the doping rate is still an open question. In particular, the intercalation sites as a function of the doping rate are still not identified. The different sites available (...)

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Structural properties of carbon peapods

Involved researchers : L. Alvarez, J.L.Sauvajol, R. Almairac, M.Chorro, S. Rols, J. Cambedouzou, J.L. Sauvajol Collaborations : M. Mezouar, ID 27 (ESRF, Grenoble), H. Kataura (AIST, Japan) Recently, much effort have been focussed on the so-called "carbon peapods", consisting in C60 molecules trapped into single-walled carbon nanotubes (figure 1). Structural properties have been studied under high-pressure/high-temperature conditions (HPHT) by in situ X-ray diffraction on the ID27 beamline at ESRF. (...)

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Structural properties of iodine intercalated carbon nanotubes

Involved researchers : L. Alvarez, J.L. Bantignies, J.L.Sauvajol, R. Leparc, A. Zahab, R. Aznar Collaborations : A. San Miguel, D. Machon (LPMCN, Lyon), M. Chorro, O. Mathon (BM 29, ESRF, Grenoble), P. Lagarde, J.P. Itié, A.M. Flank (SLS, Villigen, Switzerland), P. Launois, J. Cambedouzou, (LPS, Orsay) Insertion of SWNT with halogens (iodine) improves the SWNT conductivity by charge transfer. Our works by X-ray absorption spectroscopy (EXAFS) in collaboration with the beamline BM29 at the ESRF (...)

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Quater-thiophene encapsulated into single walled carbon nanotubes

Involved researchers : L. Alvarez, J.L. Bantignies, J.L.Sauvajol, R. Leparc, A. Zahab Collaborations : P. Hermet (FUNDP, Namur, Belgique), R. Babaa, P. Jegou (CEA, Saclay), S. Rols (ILL, Grenoble) Encapsulation of conjugated polymers into SWNT can extend the optical properties of SWNT to the UV domain. Thus, the whole system could be used as a nanodiode being able of absorbing light over a wide range, from the UV to the near infrared. Very recently, we undertook studies in collaboration with CEA (...)

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Modeling of adsorption in/on carbon nanostructures (and beyond them).

Introduction. During the last half of century computational physics has grown in scope and importance to a point where it became a third part of the traditional division between experimental and theoretical physics. Computer simulations second the real experiment and bring an additional insight, at the microscopic level, into the behavior exhibited by complex systems, comprised of thousands to millions of atoms and with large numbers of degrees of freedom. Currently, the computation research program (...)

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