{"id":165495,"date":"2017-07-26T13:00:30","date_gmt":"2017-07-26T13:00:30","guid":{"rendered":"https:\/\/eenewseurope.artwhere.co\/des-semi-conducteurs-a-deux-visages\/"},"modified":"2017-07-26T13:00:30","modified_gmt":"2017-07-26T13:00:30","slug":"des-semi-conducteurs-a-deux-visages","status":"publish","type":"post","link":"https:\/\/www.ecinews.fr\/fr\/des-semi-conducteurs-a-deux-visages\/","title":{"rendered":"Des semi-conducteurs \u00e0 deux visages"},"content":{"rendered":"

Connaissez-vous les particules de Janus ? Lorsque l\u2019on applique un champ \u00e9lectrique \u00e0 un objet conducteur plac\u00e9 entre deux \u00e9lectrodes dans une solution \u2013 un m\u00e9tal par exemple -, celui-ci se polarise, et acquiert des charges oppos\u00e9es \u00e0 ses extr\u00e9mit\u00e9s. Il peut alors subir des r\u00e9actions d\u2019oxydo-r\u00e9duction, brisant la sym\u00e9trie de la particule, laissant appara\u00eetre deux faces distinctes. On obtient alors une particule de Janus, en r\u00e9f\u00e9rence au Dieu romain \u00e0 deux visages. Ce processus simple bas\u00e9 sur un concept d\u2019\u00e9lectrochimie dite \u00ab sans fil \u00bb, permet de synth\u00e9tiser en grande quantit\u00e9 ces particules de Janus. Probl\u00e8me : cette transformation n\u00e9cessite en principe une bonne conductivit\u00e9 \u00e9lectrique des particules \u00e0 modifier, raison pour laquelle, jusqu\u2019\u00e0 pr\u00e9sent, les semi-conducteurs ne pouvaient pas \u00eatre utilis\u00e9s dans ce contexte. Une solution vient d\u2019\u00eatre trouv\u00e9e.<\/p>\n

En effet, les chercheurs <\/span><\/strong>de l\u2019Institut des sciences mol\u00e9culaires <\/span><\/strong>de Bordeaux <\/span><\/strong>ont soumis les particules semi-conductrices non seulement \u00e0 un champ \u00e9lectrique, mais \u00e9galement \u00e0 une irradiation UV. Le r\u00f4le de la lumi\u00e8re est de venir exciter les \u00e9lectrons du semi-conducteur, le rendant ainsi plus sensible au champ \u00e9lectrique. La polarisation et par cons\u00e9quent la dissym\u00e9trie de la particule peut alors s\u2019op\u00e9rer. L\u2019exp\u00e9rience a \u00e9t\u00e9 men\u00e9e avec comme semi-conducteur, des particules de dioxyde de titane (TiO2<\/sub>) couramment utilis\u00e9es pour fabriquer des cellules photovolta\u00efques, entre autres. R\u00e9sultat : baign\u00e9es dans une solution de sel m\u00e9tallique, soumises simultan\u00e9ment \u00e0 un champ \u00e9lectrique et une irradiation, les particules se transforment et une double face appara\u00eet – un c\u00f4t\u00e9 m\u00e9tallique, et un autre c\u00f4t\u00e9 ne montrant aucune modification.<\/p>\n

Ces nouvelles particules hybrides semi-conductrices s\u2019int\u00e8grent dans un champ d\u2019application tr\u00e8s vaste, qui s\u2019\u00e9tend du domaine de la photocatalyse (traitement de l\u2019eau, de l\u2019air, antibact\u00e9rien\u2026) jusqu\u2019aux produits cosm\u00e9tiques. <\/p>\n

 <\/p>\n

R\u00e9f\u00e9rence<\/span><\/h3>\n

S. Tiewcharoen, C. Warakulwit, V. Lapeyre, P. Garrigue, L. Fourier, C. Elissalde, S. Buffi\u00e8re, P. Legros, M. Gayot, J. Limtrakul & A. Kuhn<\/p>\n

Anisotropic Metal Deposition on TiO2<\/sub> Particles by Electric Field Induced Charge Separation<\/span><\/strong><\/span><\/p>\n

Angewandte Chemie<\/span><\/em> 29 juin 2017<\/span><\/strong>
\nDOI: 10.1002\/ange.201704393<\/span><\/a><\/p>\n

 <\/p>\n

Contact chercheur<\/span><\/h3>\n

Alexander Kuhn<\/span><\/strong>, Institut des sciences mol\u00e9culaires – Bordeaux<\/p>\n

Courriel : kuhn@enscbp.fr<\/span><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Des particules semi-conductrices \u00ab double-face \u00bb, c\u2019est d\u00e9sormais possible. Des chercheurs de l\u2019Institut des sciences mol\u00e9culaires (CNRS\/Universit\u00e9 de Bordeaux\/Bordeaux INP), en collaboration avec des scientifiques de l\u2019Institut de chimie de la mati\u00e8re condens\u00e9e de Bordeaux (CNRS) et deux \u00e9quipes tha\u00eflandaises (VISTEC \u00e0 Rayong et Kasetsart University \u00e0 Bangkok) viennent de mettre au point un nouveau proc\u00e9d\u00e9 permettant de synth\u00e9tiser des particules semi-conductrices asym\u00e9triques. De tels objets bifonctionnels promettent des applications dans le domaine de la catalyse, et plus particuli\u00e8rement la photolyse de l\u2019eau. <\/p>\n","protected":false},"author":9,"featured_media":165496,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[],"tags":[],"domains":[47],"ppma_author":[1141],"class_list":["post-165495","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","domains-electronique-eci"],"acf":[],"yoast_head":"Des semi-conducteurs \u00e0 deux visages ...<\/title>\n<meta name=\"description\" content=\"Des particules semi-conductrices \u00ab double-face \u00bb, c\u2019est d\u00e9sormais possible. 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