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Article Dans Une Revue Langmuir Année : 2019

Liquid-Crystalline Suspensions of Photosensitive Paramagnetic CeF 3 Nanodiscs

Fréderic Chaput
Frédéric Lerouge
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David Amans
Ivan Dozov
Stéphane Parola
Patrick Davidson

Résumé

The design of high-performance energy-converting materials is an essential step for the development of sensors, but the production of the bulk materials currently used remains costly and difficult. Therefore, a different approach based on the self-assembly of nanoparticles has been explored. We report on the preparation by solvothermal synthesis of highly crystalline CeF 3 nanodiscs. Their surface modification by bisphosphonate ligands led to stable, highly concentrated, colloidal suspensions in water. Despite the low aspect ratio of the nanodiscs (∼6), a liquidcrystalline nematic phase spontaneously appeared in these colloidal suspensions. Thanks to the paramagnetic character of the nanodiscs, the nematic phase was easily aligned by a weak (0.5 T) magnetic field, which provides a simple and convenient way of orienting all of the nanodiscs in suspension in the same direction. Moreover, the more dilute, isotropic, suspensions displayed strong (electric and magnetic) fieldinduced orientation of the nanodiscs (Kerr and Cotton−Mouton effects), with fast enough response times to make them suitable for use in electro-optic devices. Furthermore, an emission study showed a direct relation between the luminescence intensity and magnetic-field-induced orientation of the colloids. Finally, with their fast radiative recombination decay rates, the nanodiscs show luminescence properties that compare quite favorably with those of bulk CeF 3. Therefore, these CeF 3 nanodiscs are very promising building blocks for the development and processing of photosensitive materials for sensor applications.

Domaines

Matériaux Chimie
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Dates et versions

hal-03103061 , version 1 (14-01-2021)

Identifiants

Citer

Fréderic Chaput, Frédéric Lerouge, Anne-Laure L Bulin, David Amans, Mateusz Odziomek, et al.. Liquid-Crystalline Suspensions of Photosensitive Paramagnetic CeF 3 Nanodiscs. Langmuir, 2019, 35 (49), pp.16256-16265. ⟨10.1021/acs.langmuir.9b02335⟩. ⟨hal-03103061⟩
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