Publication
610
Surface Science. , 600 , 4801 - 4812, 2006.
DOI: 10.1016/j.susc.2006.07.061
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Study of the spontaneous formation of organic layers on carbon and metal surfaces from diazonium salts |
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Alain Adenier, Nicole Barré, Eva Cabet-Deliry, Annie Chaussé, Sophie Griveau, Florence Mercier, Jean Pinson and Christine Vautrin-Ul
LaLaboratoire Analyses et Modélisation pour le Biologie et l'Environnement UMR 8587,Université d'Evry, Val d'Essonne-CNRS-CEA, 1 rue du Père Jarland, F-91025 Evry Cedex,
France, Laboratoire d'Electrochimie Moléculaire, UMR 7591, Université Paris 7-CNRS, 2 place Jussieu, F-75251 Paris Cedex 05, France, Alchimer, 15 rue du Buisson aux Fraises, F-91300 Massy, France, ITODYS, Université Paris 7
Denis Diderot, associé au CNRS (UMR 7086), 1 rue Guy de La Brosse, F-75005 Paris, France
This study investigates the spontaneous grafting of different
para-substituted phenyl groups on carbon and metallic surfaces from diazonium
salts solutions. Glassy carbon, nickel, zinc and iron plates were allowed to
react with an acetonitrile solution of aryldiazonium tetrafluoroborate salt by
simple dipping. The surfaces were characterized before and after their immersion
by XPS and AFM to evidence the formation of a coating on the different
materials. The results are indicative of the presence of substituted phenyl
groups on all the investigated surfaces. This study also aims at correlating
grafting efficiency with metal reactivities and diazonium salt electronic
properties by means of AFM and FT-IRRAS. For this purpose, zinc and nickel were
chosen due to their opposite reducing properties and two diazonium salts were
selected with electron-donor or -withdrawing para-substituents. The results tend
to indicate that redox properties of both partners (diazonium + metal)
are of prime importance for grafting to occur. |