title: Multiredox tetrathiafulvalene-modified oxide-free hydrogen-terminated Si(100) surfaces.
abstract: Tetrathiafulvalene (TTF) monolayers covalently bound to oxide-free hydrogen-terminated Si(100) surfaces have been prepared from the hydrosilylation reaction involving a TTF-terminated ethyne derivative. FTIR spectroscopy characterization using similarly modified porous Si(100) substrates revealed the presence of vibration bands assigned to the immobilized TTF rings and the Si-C═C- interfacial bonds. Cyclic voltammetry measurements showed the presence of two reversible one-electron systems ascribed to TTF/TTF(.+) and TTF(.+)/TTF(2+) redox couples at ca. 0.40 and 0.75 V vs SCE, respectively, which compare well with the values determined for the electroactive molecule in solution. The amount of immobilized TTF units could be varied in the range from 1.7 × 10(-10) to 5.2 × 10(-10) mol cm(-2) by diluting the TTF-terminated chains with inert n-decenyl chains. The highest coverage obtained for the single-component monolayer is consistent with a densely packed TTF monolayer.
authors.affiliation: Sciences Chimiques de Rennes, UMR 6226 CNRS/Université de Rennes 1, MaCSE, Campus de Beaulieu, 35042 Rennes Cedex, France.
authors.forename: Gilles
authors.initials: G
authors.lastname: Yzambart
authors.forename: Bruno
authors.initials: B
authors.lastname: Fabre
authors.forename: Dominique
authors.initials: D
authors.lastname: Lorcy