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The University of Southampton

Localized Electrochemistry and Controlled Modifications of Surfaces. Seminar

25 March 2014
Building 27, Room 2003 Chemistry University of Southampton Southampton SO17 1BJ

For more information regarding this seminar, please email Dr Andrew Hector at .

Event details

Philippe Hapiot presents a seminar as part of the of the electrochemistry sections seminar series.

Philippe Hapiot - Localized Electrochemistry and Controlled Modifications of Surfaces.

For the last twenty years, there has been a large development of surface functionalization toward surfaces exhibiting remarkable physical and chemical properties. More recently, one could observe the explosion of research efforts based on several physical and chemical deposition techniques to generate micro and now nano-structured surfaces or surfaces supporting nano-objects like nanoparticles or dendrimers. These efforts are supported by the large range of possible applications as for example those in analytical, bio-analytical chemistry or molecular electronic. In relation with these expending fields, classical electrochemistry and the more recent developments of electrochemistry at a local scale (micro- and nano-electrochemistry) appear as versatile and straightforward means for building and analyzing functionalized and nanostructured surfaces.

In this lecture, the developments of a global electrochemical strategy for preparing versatile and robust reactive platforms will be presented. Such molecular platforms could be used for immobilizing active molecules onto different substrates especially on carbon materials.[1,2] These strategies are based on the electro-grafting of electro-generated aryl radicals [3] followed by a post-functionalization of the first grafted layer, allowing us to preserve the activity of fragile immobilized groups.[1-4] This approach could be extended to the controlled design of multifunctional films (a film containing at least two functional groups) that are covalently bonded to the surface.

In a second part of the lecture, we will discuss how the surface reaction properties of the functionalized surface could be probed through electrochemical techniques, Scanning Electrochemical Microscopy (SECM) being particularly well adapted. SECM also permits reversible or irreversible patterning of the layer. Different examples of such modified surfaces and of their applications will be presented, notably recent results in relation with the study of surface reactions implying reactive oxygen species.[4-6]

[1] Leroux, Y. R.; Fei, H.; Noël, J.-M.; Roux, C.; Hapiot, P. J. Am. Chem. Soc. 2010, 132, 14039.
[2] Cremer, P.S. J. Am. Chem. Soc. (Editorial) 2011, 133, 167.
[3] Pinson, J.; Podvorica, F. Chem. Soc. Rev. 2005, 34, 429.
[4] Zigah, D.; Noel, J.-M.; Lagrost, C.; Hapiot, P. J. Phys. Chem. C 2010, 114, 3075.
[5] Wang, A.; Ornelas, C.; Astruc, D.; Hapiot, P. J. Am. Chem. Soc. 2009, 131, 6652.
[6] J.-M. Noël, A. Latus, C. Lagrost, E. Volanschi, P.Hapiot, J. Am. Chem. Soc. 2012, 134, 2835–2841

Speaker information

Philippe Hapiot, Sciences Chimiques de Rennes, Université de Rennes 1. Philippe Hapiot was born in Paris, France in 1960 and obtained his Ph.D. degree from the University of Paris 7 in 1988 in Electrochemistry under the supervision of Prof. J.-M. Savéant. In 2000, he joined the University of Rennes 1 where he has a current position as Directeur de Recherche in the Centre National of Scientific Research (CNRS). His research interests concern the mechanisms and reactivity in molecular and interfacial electrochemistry taking advantage of fast or localized electrochemical techniques, Scanning Electrochemical Microscopy and modelization of electrochemical processes. His current researches focussed on the electrochemical reactivity in ionic liquids, surface functionalization on metallic and semi-conductor electrodes considering special effects due to environment.

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