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Portal > Offres > Offre UMR8502-ERWPAI-001 - Postdoctorat (H/F) sur la photocatalyse dans des nanostructures polarisées

Postdoc (H/F) on photocatalysis in polarized nanostructures

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Français - Anglais

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General information

Reference : UMR8502-ERWPAI-001
Workplace : ORSAY
Date of publication : Friday, July 12, 2019
Type of Contract : FTC Scientist
Contract Period : 18 months
Expected date of employment : 1 November 2019
Proportion of work : Full time
Remuneration : 2700 euros gross monthly
Desired level of education : 5-year university degree
Experience required : Indifferent

Missions

We are looking for a highly motivated candidate to work on the synthesis of hybrid nanostructures and their use for nanoconfinement assisted photocatalysis applications.

Activities

Nanotubes have been recognized as an ideal one-dimensional (1D) nano-platform appealing applications among others for energy conversion or as catalytic nanoreactors. In parallel, the concept of selective photocatalysis has begun to receive attention with the development of photo-active 2D and 3D nanostructures with permanent polarization and efficient electron-hole separation. To the best of our knowledge, the use of polarized, diameter-controlled, nanotubes for enhancing the selectivity in photocatalyis is yet to be explored.
Imogolite nanotubes (INT) with nominal composition (OH)3XO3Y(R) (with X = Al, Fe, Cr…; Y = Si, Ge, Ti…; R = -OH; -CH3…) appear as promising photoactive nanostructures: (i) the synthesis of INT produce monodisperse samples in diameter with tunable pore size (1-3 nm); (ii) hydrophilic INTs can be easily made hydrophobic through the methylation of the inner cavity during the synthesis; (iii) INTs bears a unique permanent polarization of the nanotube wall and a real-space separation of the valence and conduction bands, which may be effective for photocatalytic activity. However, no one has combined these different properties to selectively functionalize the nanotubes up to now.
The aim of this postdoctoral fellowship will be to develop novel hybrid nanotubes with nanostructured amphoteric and polarized interfaces by extended the possibility of doping INT walls. The successful completion of hybrid INTs will be realized in two steps. The first one will be a “coarse” characterization by coupling TEM observations, X-ray scattering and IR experiments in order to quickly establish the obtaining of nanotubes and their growth mechanisms. If the results are positive, the second step will be to exploit these nanotubes for selective reduction / oxidation of different reactants on different sides of the nanotube cavity and to control kinetics of the redox event for confined molecules. External collaborations will allow him/her to put the results in perspective with complementary experiments such as transient optical spectroscopy at different time scales at Laboratoire de Chimie Physique in Orsay and on Laser facilities) coupled with atomistic simulations.

Skills

The candidate must have a PhD in materials science with experiences in synthesis chemistry and, possibly, an expertise in photochemistry. He/she should be highly motivated by experimentation and should possess organizational skills as well as the ability to work both independently and as part of a team.

Work Context

The postdoc will be based at the Laboratoire de Physique des Solides (LPS) of University Paris Sud and will work in collaboration with Laboratoire de Chimie Physique (LCP, Univ. Paris Sud). . Over the duration of the contract, the candidate will also be involved in conducting experiments on large instruments (synchrotron, laser).

Constraints and risks

Use of X-rays

Additional Information

This postdoc is part of a french research program (ANR-18-CE09-0001)

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