CE09 - Nanomatériaux et nanotechnologies pour les produits du futur

Coupling Confinement and photoCatalysis in POlarized nanotubes – C3PO

Submission summary

With the rise of nanosciences, nanotubes have been recognized as an ideal platform for fundamental confinement research. They have been suggested as promising building blocks that could outperform current technologies for nanofluidic, molecular sieving or energy storage. In the meantime, the concept of nanoconfinement-assisted photocatalysis has started to receive attention with the development of photo-active nanostructures with permanent polarization. However, the use of polarized nanotubes for coupling confinement and photocatalysis is yet to be explored. This challenging concept requires controlling at the nanometer-scale the interactions with the interface, a control that has never been achieved so far.
In this context, metal-oxide aluminosilicate and germanate imogolite nanotube (INT) appear as perfect candidates for three reasons:
(i) the synthesis of INT produce monodisperse samples in diameter with tunable pore size (from 1 to 3 nm) and interfaces properties (hydrophilic or hydrophobic) through atomic substitution
(ii) the growth mode of INTs by oriented attachment (OA) during the ageing stage offers a unique path to control at the angstrom level the morphology of the final nanotube
(iii) the nanotubes display a permanent polarization of the tube-wall and a real-space separation of the valence and conduction bands, which may be effective for enhanced photocatalytic activities

C3PO project is a Young Research (JCJC) project, which has the ambitious objective to open novel routes to develop diameter-controlled nanotubes with tunable amphoteric and polarized walls for confinement-assisted photocatalysis applications. The first task will be the exploration of novel chemical routes to produce innovative structures with nanostructured interfaces. The formation of hybrid nanotubes will be optimized by following in situ their growth mechanisms. The second task will investigate the confinement properties and the exploitation of wall polarization for photocatalysis. The outcomes of the proposed project should also affect the emerging field of confinement in ultimate nanochannels, where molecule properties strongly depart from what the frameworks of continuum approaches would predict.
This JCJC project poses an important prerequisite for future developments in nanomaterials and nanotechnologies. Although this upstream project is not aimed at any one application in particular, rather, the expected benefits acquired from its realization should affect several up-to-date challenges for future technological developments:
- Designing innovative hybrid nanostructures with hybrid interfaces in a predictive way
- Controlling at the nanometer-scale the interactions with the interface upon confinement
- Exploring for the first time the concept of confinement-assisted photocatalysis in polarized nanoporous objects

Project coordination

Erwan Paineau (Laboratoire de Physique des Solides)

The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.

Partner

CNRS - LPS Laboratoire de Physique des Solides

Help of the ANR 255,789 euros
Beginning and duration of the scientific project: December 2018 - 36 Months

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