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Séparation de charges induite par la courbure dans des nanotubes d'aluminosilicate

Marie-Claire Pignié 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 : This work consists of an exploratory study of imogolites for photocatalytic applications. This clay is an inorganic nanotube reported to exhibit a wall polarization that would allow the separation of photogenerated charge carriers. We offer a quantification of the potential difference across the wall using spectroscopic methods. Its value is worth 0.7 eV for the imogolite analogous to the natural material and 0.2 eV in the case of the hybrid imogolite, whose cavity is made hydrophobic by functionalization. The fate of charges generated by irradiation has been studied. The electron is detected after solvation on the external surface by pulsed radiolysis. The hole would thus be directed towards the internal surface. This movement of charge carriers, directed by the wall polarization, opens the way to the use of imogolites as nano-reactors with differentiated reactions at its internal and external surfaces. The reactivity of imogolite is characterized by the proposal of radiolysis reaction mechanisms. The hability to adsorb organic molecules in the hydrophobic cavity of the hybrid imogolite allowed us to better understand the influence of encapsulation of redox species, using ferrocene. Clusters of evidence tend to show the existence of a charge transfer between this compound and the imogolite wall. Moreover, the encapsulation would decrease its apparent potential. The polarization of the wall would thus make it less oxidizing.
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Submitted on : Wednesday, March 9, 2022 - 3:56:09 PM
Last modification on : Tuesday, September 27, 2022 - 4:37:46 AM

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  • HAL Id : tel-03603049, version 2

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Marie-Claire Pignié. Séparation de charges induite par la courbure dans des nanotubes d'aluminosilicate. Matériaux. Université Paris-Saclay, 2022. Français. ⟨NNT : 2022UPASF004⟩. ⟨tel-03603049v2⟩

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