title: Electrografting of alkyl films at low driving force by diverting the reactivity of aryl radicals derived from diazonium salts.
abstract: Alkyl and partial perfluoroalkyl groups are strongly attached to carbon surfaces through (i) the abstraction of the iodine atom from an iodoalkane by the sterically hindered 2,6-dimethylphenyl radical and (ii) the reaction of the ensuing alkyl radical with the carbon surface. Since the 2,6-dimethylphenyl radical is obtained at -0.25 V/Ag/AgCl by reducing the corresponding diazonium salt, the electrografting reaction is facilitated by ∼1.7 V by comparison with the direct electrografting of the iodo compounds. Layers of various thicknesses, including monolayers, are obtained by controlling the time duration of the electrolysis. The grafted films are characterized by electrochemistry, IR, XPS, ellipsometry, and water contact angles.
authors.affiliation: Université Paris Diderot , Sorbonne Paris Cité, ITODYS, UMR 7086 CNRS, 15 rue J-A de Baïf, 75205 Paris Cedex 13, France.
authors.forename: Dardan
authors.initials: D
authors.lastname: Hetemi
authors.forename: Frédéric
authors.initials: F
authors.lastname: Kanoufi
authors.forename: Catherine
authors.initials: C
authors.lastname: Combellas
authors.forename: Jean
authors.initials: J
authors.lastname: Pinson
authors.forename: Fetah I
authors.initials: FI
authors.lastname: Podvorica
mesh_terms: D003979:Diazonium Compounds / Q000737:chemistry*; D055664:Electrochemical Techniques; D005609:Free Radicals / Q000737:chemistry; D008567:Membranes, Artificial; D014992:Xylenes / Q000737:chemistry*
chemical_list: D003979:Diazonium Compounds; D005609:Free Radicals; D008567:Membranes, Artificial; D014992:Xylenes; C036531:2,6-xylenol