Purification et fonctionnalisation d'échantillons de nanotubes de carbone mono-feuillets : efficacité et sélectivité des traitements chimiques

Abstract : The discovery of single-walled carbon nanotubes (SWCNTs) in 1993 by S. Iijima has been one of the milestones of scientific research in the domain of nanos. The study of their properties has revealed that they were superior to those of materials already known and has let to foresee a field of numerous potential applications. The actual methods of synthesis enable to produce SWCNTs in large quantities. However, the SWCNT samples can be heterogeneous regarding both their composition (carbonaceous and metal impurities) and the features of the as-produced SWCNTs. Post-synthesis treatments are therefore indispensable to improve the characteristics of the samples. In this work, firstly we have carried out a standard multi-step purification procedure. In agreement with literature, the optimization of experimental parameters notably those used for the oxidation treatment did not permit us to obtain neither good yields of purification nor efficient selectivity of reaction. An alternative purification method has thus been developed. It consists mainly in a thermal treatment under a dichlore stream. It has enabled to significantly decrease the proportion of metallic impurities in the samples while preserving the nanotubes. It has also shown that this new purification process was efficient with samples produced by different methods. The other main difficulty in using nanotubes is their processability. Chemical functionalization is then needed to modify nanotube surface properties. In that case, we have studied the grafting of probe functions
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Guillaume Mercier. Purification et fonctionnalisation d'échantillons de nanotubes de carbone mono-feuillets : efficacité et sélectivité des traitements chimiques. Autre. Université de Lorraine, 2012. Français. ⟨NNT : 2012LORR0065⟩. ⟨tel-01749285⟩

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