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Le Pr. Alison Downard (MacDiarmid Institute for Advanced Materials and Nanotechnology, University of Canterbury, Nouvelle Zélande) donnera, le jeudi 7 octobre à 10h30 en amphithéâtre Georges Urbain, un séminaire intitulé Investigations and Applications of Spontaneous Grafting of Aryldiazonium Salts .
> Contact :
- Catherine Combellas
- Laboratoire de Sciences analytiques, bioanalytiques et miniaturisation
- 01 40 79 46 08 - catherine.combellas@espci.fr
Résumé
Investigations and Applications of Spontaneous Grafting of Aryldiazonium Salts
Alison J. Downard
MacDiarmid Institute for Advanced Materials and Nanotechnology, Department of Chemistry, University of Canterbury, Private Bag 4800, Christchurch, New Zealand
Electrografting of thin organic films to conducting substrates by reduction of aryldiazonium salts is a widely studied reaction. More recently, spontaneous or open-circuit potential (OCP) grafting at carbon and industrial metals has received some focused attention. The mechanism of the spontaneous grafting of aryldiazonium cations to surfaces is not yet well-understood, particularly for materials such as carbon and gold. This presentation will describe our recent studies of the OCP reactions at gold and carbon substrates, using electrochemistry, atomic force microscopy and OCP measurements. Microcontact printing of surface layers, relying on the spontaneous reaction of the diazonium salt ‘ink’ with the substrate will also be discussed. Microcontact printing is a simple, fast and relatively low-tech approach to surface patterning. We have developed methods suitable for preparing single component patterned surfaces and also bi-functional two component patterns.