Caractérisation expérimentale d'un plasma d'arc électrique en vue du contrôle de la synthèse des nanotubes de carbone monoparois

Abstract : The study carried out within the framework of this thesis relates to the synthesis control of the Single Walled Carbon Nanotubes (SWCNTs) by the electric arc technique. Three privileged regions are studied: the anodic region, the plasma medium and the growth region of SWCNTs. The plasma diagnostic was carried out by optical emission spectroscopy in order to correlate its real state (field of temperature and concentrations of the species) with the yield and purity of SWCNTs obtained. The characterization of carbon materials was realized using High Resolution Transmission Electron Microscopy (HRTEM). Many parameters are studied such as the interelectrode gap, the apparent density of the filler materials, the engine volume. . , in order to evaluate their influence on the plasma characteristics, on the thermal gradients in the growth zone, and on the yield and the purity of SWCNTs obtained. It is shown in this work that a relatively weak cooling and a high density of carbon in the plasma, coupled with high thermal gradients in the growth zone, are keys elements for obtaining high yields of clean SWCNTs.
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Ali Jawad Mansour. Caractérisation expérimentale d'un plasma d'arc électrique en vue du contrôle de la synthèse des nanotubes de carbone monoparois. Physique [physics]. Université Paul Sabatier (Toulouse 3), 2007. Français. ⟨NNT : 2007TOU30064⟩. ⟨tel-01816074⟩

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