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De l’interêt du dichlore pour une élimination hautement sélective des impuretés métalliques et carbonées des nanotubes de carbone

Abstract : Since their discovery, carbon nanomaterials such as carbon nanotubes (CNTs) and graphene have raised a great interest in the scientific community. Indeed, they are impressive materials thanks to their unique and remarkable properties: nanometric size and lightness, high chemical stability due to their all-carbon structure, high specific surface area. However, after their synthesis, available CNT samples contain impurities (metallic catalyst residues and carbonaceous). These unwanted particles hinder exploitation of the properties of the CNTs and thus prevent the scale-up transfer. This is the reason why a post-synthesis purification treatment is required. Existing standard methods are often too aggressive, time-consuming because of the multi steps involved and they lead to low sample yields. In this work, we have developed an alternative purification approach. The combination of two reactants in gas phase (chlorine and dioxygen) allowed us to propose an original method consisting of a one-pot treatment. Thanks to this simple technique, we were able to substantially enhance the removal selectivity of both metallic based and carbonaceous impurities while preserving CNT quality; the sample yields obtained with our method are indeed high. In addition to its simplicity and efficiency, this method is versatile since it has been successfully applied to various types of CNTs. Finally, these works have a significant social-economic impact and in terms of innovation because these purified CNTs can be used for sustainable development. The prepared CNT-based nanofluids have the potential to be utilized as heat transfer fluid in solar panels. We have also shown that these carbon nanomaterials, once being functionalized, had a high interest in green synthesis methods, in particular in enzymatic biocatalysis.
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Submitted on : Tuesday, March 24, 2020 - 10:46:05 AM
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Nawal Berrada. De l’interêt du dichlore pour une élimination hautement sélective des impuretés métalliques et carbonées des nanotubes de carbone. Matériaux. Université de Lorraine, 2019. Français. ⟨NNT : 2019LORR0164⟩. ⟨tel-02516906⟩



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