Purification, recuit et désassemblage d'échantillons de nanotubes de carbone : propriétés structurales et caractérisations de surface

Abstract : Due to their superior chemical and physical properties, Carbon NanoTubes (CNTs) and, in particular, Single Walled Carbon Nanotubes (SWNTs) are recognized to have a huge potential in many fields of applications. Nevertheless large scale production of high quality CNT samples is still challenging. The presence of metallic particles and the gathering of CNTs into bundles in as-produced samples constitute strong obstructions for their technological development. In this work, we develop effective chemical treatments to increase the sample purity and reduce the bundle size without damaging the CNT structure. To remove metal-related impurities, we used an alternative purification process which consists in heating the as-produced CNT samples under a chlorine atmosphere. The obtained purified samples were then processed with an intercalation-dispersion-debundling procedure. The dispersed and ramified SWNTs are afterward self-assembled at an air/solvent interface. The obtained assembled SWNTs show an improved adsorption capacity and increased accessible surfaces compared to those of the as-produced SWNTs. The precise characterization of samples by means of complementary techniques after each treatment constitutes an important part of this work. In particular, surface analyses were carried out by adsorption volumetry, which is particularly sensitive to surface modifications related to chemical treatments. By means of the modeling of krypton adsorption measurements, we quantify the debundling state - at a macroscopic scale - of the processed CNT samples
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Émeline Rémy. Purification, recuit et désassemblage d'échantillons de nanotubes de carbone : propriétés structurales et caractérisations de surface. Autre. Université de Lorraine, 2013. Français. ⟨NNT : 2013LORR0262⟩. ⟨tel-01750609⟩

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