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Fonctionnalisation non-covalente de nanotubes de carbone mono-feuillets : étude du confinement de molécules photo-actives et intercalation de rubidium.

Abstract : This experimental work concerns the development and the study of 1D hybrid systems of single-walled carbon nanotubes non-covalently fonctionnalized. Two different approaches are discussed. The first experimental study deals with the intercalation of rubidium in carbon nanotubes bundles. The aim is to link structural and electronic properties along the doping process. To do, we developed an original and dedicated home-made set adapted to the use on synchrotron facilities. It permits the following of the intercalation by means of an in-situ multi-techniques approach. In this part, we pointed out that the local environnement of rubidium is dependant of the compound stœchiometries. It appears that oxygenated surface defects are first occupied for low doping rates. The structure modification is also linked to a semiconducting/metal transition of carbon nanotubes observed by resistance measurements and Raman spectroscopy. The second experimental study is devoted to the confinement of oligothiophenes inside single-walled carbon nanotubes. X-Ray diffraction and high resolution transmission electronic microscopy measurements demonstrate the efficiency of our encapsulation process. Several spectroscopic techniques such as UV-Visible and infrared absorptions and Raman diffusion indicate a weak charge transfer between both systems. This result is well evidenced by the profile, intensity and frequency modifications of the high frequency Raman modes. We note the good agreement of these results with the energy renormalisation of phonons discussed in the literature. In addition, some confinement effects depending on carbon nanotubes diameter are pointed out by the study of low frequency Raman modes. Two models are proposed to explain the observed trend. The first one suggests a behavior independent of the nature of the inserted element. In the second one, the number of oligothiophene chains encapsulated in function of carbon nanotubes diameter is considered. We also show a significative influence of carbon nanotube defects on hybrid systems.
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Submitted on : Wednesday, May 28, 2014 - 12:13:13 PM
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Yann Almadori. Fonctionnalisation non-covalente de nanotubes de carbone mono-feuillets : étude du confinement de molécules photo-actives et intercalation de rubidium.. Autre [cond-mat.other]. Université Montpellier II - Sciences et Techniques du Languedoc, 2013. Français. ⟨NNT : 2013MON20057⟩. ⟨tel-00997533⟩

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