title: Bottom-Up Electrochemical Fabrication of Conjugated Ultrathin Layers with Tailored Switchable Properties.
abstract: A bottom-up electrochemical process for fabricating conjugated ultrathin layers with tailored switchable properties is developed. Ultrathin layers of covalently grafted oligo(bisthienylbenzene) (oligo(BTB)) are used as switchable organic electrodes, and 3,4-ethylenedioxythiophene (EDOT) is oxidized on this layer. Adding only a few (less than 3) nanometers of EDOT moieties (5 to 6 units ) completely changes the switching properties of the layer without changing the surface concentration of the electroactive species. A range of new materials with tunable interfacial properties is created. They consist of oligo(BTB)-oligo(EDOT) diblock oligomers of various relative lengths covalently grafted onto the underlying electrode. These films retain reversible redox on/off switching and their switching potential can be finely tuned between +0.6 and -0.3 V/SCE while the overall thickness remains below 11 nm.
authors.affiliation: Université Paris Diderot , Sorbonne Paris Cité, ITODYS, UMR 7086 CNRS, 15 rue Jean-Antoine de Baïf, 75205 Paris Cedex 13, France.
authors.forename: Verena
authors.initials: V
authors.lastname: Stockhausen
authors.affiliation: Université Paris Diderot , Sorbonne Paris Cité, ITODYS, UMR 7086 CNRS, 15 rue Jean-Antoine de Baïf, 75205 Paris Cedex 13, France.|Department of Advanced Materials Science and Nanotechnology, University of Science and Technology of Hanoi (USTH), Vietnam Academy of Science and Technology , 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam.
authors.forename: Van Quyen
authors.initials: VQ
authors.lastname: Nguyen
authors.affiliation: Université Paris Diderot , Sorbonne Paris Cité, ITODYS, UMR 7086 CNRS, 15 rue Jean-Antoine de Baïf, 75205 Paris Cedex 13, France.
authors.forename: Pascal
authors.initials: P
authors.lastname: Martin
authors.affiliation: Université Paris Diderot , Sorbonne Paris Cité, ITODYS, UMR 7086 CNRS, 15 rue Jean-Antoine de Baïf, 75205 Paris Cedex 13, France.
authors.forename: Jean Christophe
authors.identifier: http://orcid.org/0000-0002-7024-4452
authors.initials: JC
authors.lastname: Lacroix
keywords: bottom-up approach; diazonium grafting; molecular electronics; nanoelectrochemistry; ultrathin film; π-conjugated material