Séminaire Dr. Yann Leroux de l’Institut des Sciences Chimiques de Rennes "Attachment of robust functional monolayer by reduction of aryl diazonium salts"

AIME
leroux
Date: 2017-06-12 10:30

Lieu: Bibliothèque de l'équipe AIME, 1er étage du bâtiment 15  |  Ville: Montpellier, France

Yann Leroux a soutenu sa thèse en 2007 sous la direction de J.C. Lacroix à l’université Paris 7-Denis Diderot portant sur l’électrochimie sur des surfaces nanosctucturées et la nano-électrochimie.
Il a effectué un stage post-doctoral à Bâle (Suisse) dans le groupe du Pr. M. Mayor, ou il a travaillé sur la synthèse de fils moléculaires et la modification de surfaces. Chargé de recherche à l’université de Rennes 1 depuis 2009, il travaille dans l’équipe de Ph. Hapiot et s’intéresse particulièrement à la modification contrôlée de surfaces par électro-réduction de sels d’aryles diazonium et la microscopie électrochimique. 


Abstract

Since the earlier works of Whitesides and coworkers concerning the preparation of Self-Assembled Monolayers (SAMs) on gold substrates, SAMs represent one of the best systems available for studying the contribution of molecular structure and composition to the macroscopic properties of materials. Unfortunately, this technique cannot be extended to other materials and provides weakly robust interfaces, which make them suitable for laboratory research but limit their use in real applications. Since its discovery in the beginning of the 90s, the (electro-) reduction of aryl diazoniun salts is now often used as surface modification technique. The main advantages of this technique are: i) it produces highly robust interfaces and ii) it can be applied to a wide range of materials (conductors, semiconductors, insulators). Its major drawbacks remain in the difficulties of controlling the vertical extent of the reaction. Aryl radicals that are produced during this process, are highly reactive species and they rapidly add to the substrate electrode where they are produced, but also react with the already-grafted aryl layers. This generally leads to multiple attachments and formation of disordered poly-aryl multilayers. Only recently, a few research groups proposed new methods to achieve monolayers onto carbon surfaces, using the electro-reduction of aryl diazonium salt. These new approaches can lead to the development of carbon materials as substrates supporting functional monolayers and can find applications in electrochemical (bio) sensors, analytical chemistry or molecular electronics. In this presentation, an overview of the different methods used to control the thickness and organization of electro-grafted organic layer by the reduction of aryl diazonium salts will be presented.

 

Email
olivier.fontaine@umontpellier.fr
Adresse
Montpellier, France

 

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  • 2017-06-12 10:30

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