Structure et croissance de nanotubes de Ge-imogolite simple et double-paroi

Perrine Maillet 1
1 LIONS - Laboratoire Interdisciplinaire sur l'Organisation Nanométrique et Supramoléculaire
NIMBE UMR 3685 - Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M)
Abstract : Imogolites are natural materials discovered during the sixties in japanese volcanic soils. Their structure is analogue to carbone nanotubes. Imogolite synthesis, described since 1977, gives nanotubes whose dimensions are well defined and monodisperse. Recently, it has been shown that it is possible to synthesize analogues containing germanium in concentration conditions that are much higher than classical silicium imogolites. That's why we have chosen this material to study the preparation of mesoporous materials from the assembly of anisotropic nanoparticles. Thanks to a SAXS and TEM characterization of these nanotubes, we have demonstrated that these analogues can present two types of tubular structures: a classical single-walled nanotube structure but also a double-walled one that had never been observed before. Moreover, the high concentration used in this synthesis has allowed us to precise the structure of the synthesis precursors called protoimogolites. We have indentified the parameter that control the type of the structure formed and then we have studied the growth mechanism of these nanotubes. Finally, the first temptatives about nanotubes organization when they are in high concentration have shown self assembly processes that are encouraging for further developments of applications.
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Perrine Maillet. Structure et croissance de nanotubes de Ge-imogolite simple et double-paroi. Physique [physics]. Université Pierre et Marie Curie - Paris VI, 2010. Français. ⟨tel-00584846⟩

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