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Experimental determination of the curvature-induced intra-wall polarization of inorganic nanotubes

Marie-Claire Pignié 1 Sabyasachi Patra 1 Lucie Huart 1 Aleksandar Milosavljević 2 Jean Renault 1 Jocelyne Leroy 3 Christophe Nicolas 2 Olivier Sublemontier 4 Sophie Le Caër 1 Antoine Thill 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)
3 LICSEN - Laboratoire Innovation en Chimie des Surfaces et NanoSciences
NIMBE UMR 3685 - Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M)
4 LEDNA - Laboratoire Edifices Nanométriques
NIMBE UMR 3685 - Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M)
Abstract : Inspired from a natural nano-mineral known as imogolite, aluminosilicate inorganic nanotubes are appealing systems for photocatalysis. One is completely hydrophilic (IMO-OH), while the other has a hydrophilic exterior and a hydrophobic interior (IMO-CH$_3$), enabling the encapsulation of organic molecules. We combined UV-Vis diffuse reflectance spectroscopy of imogolite powders and synchrotron X-ray photoelectron spectroscopy of deposited imogolite films and isolated nanotubes to obtain not only the electronic band structure, but also the quantitative intra-wall polarization of both synthetic imogolites for the first time. The potential difference across the imogolite wall was determined to be 0.7 V for IMO-OH and around 0.2 V for IMO-CH$_3$. The high curvature of the nanotubes, together with the thinness of their wall, favors efficient spontaneous charge separation and electron exchange reactions on both the internal and external nanotube surfaces. In addition, the positions of their valence and conduction band edges make them interesting candidates for co-catalysts or doped catalysts for water splitting, among other possible photocatalytic reactions relevant to energy and the environment.
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https://hal-cea.archives-ouvertes.fr/cea-03442138
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Submitted on : Tuesday, November 23, 2021 - 7:54:41 AM
Last modification on : Thursday, November 25, 2021 - 3:40:34 AM

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Marie-Claire Pignié, Sabyasachi Patra, Lucie Huart, Aleksandar Milosavljević, Jean Renault, et al.. Experimental determination of the curvature-induced intra-wall polarization of inorganic nanotubes. Nanoscale, Royal Society of Chemistry, 2021, ⟨10.1039/D1NR06462B⟩. ⟨cea-03442138⟩

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