title: Preparation of conductive PDDA/(PEDOT:PSS) multilayer thin film: influence of polyelectrolyte solution composition.
abstract: Self-assembled multilayer films made of PEDOT:PSS poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) and PDDA poly(diallyldimethylammonium chloride) were prepared using layer-by-layer method. In order to modify the growth regime of the multilayer, to fabricate an electrical conductive film and to control its thickness, the effects of pH, type of electrolyte, ionic strength and polyelectrolyte concentration were investigated. Optical reflectometry measurements show that the pH of the solutions has no effect on the film growth while the adsorbed amount increases more rapidly when BaCl2 is used instead of NaCl as electrolyte. An increase in the ionic strength (with NaCl) induces a change in the growth regime from a linear to an exponential one at low polyelectrolyte concentration. As UV-vis measurements indicate, no decomplexation of PEDOT was recorded after film preparation. With polyelectrolyte concentration below 1 g L(-1), no conductive films were obtained even if 50 bilayers were deposited. A conductive film was prepared with a polyelectrolyte concentration of 1 g L(-1) and the measured conductivity was 0.3 S m(-1). A slight increase in conductivity was recorded when BaCl2 was used probably due to a modification of the film structure.
authors.affiliation: Institut UTINAM, UMR-CNRS 6213, Université de Bourgogne Franche-Comté 16 Route de Gray, 25030 Besançon Cedex, France.
authors.forename: F E
authors.initials: FE
authors.lastname: Jurin
authors.affiliation: Institut UTINAM, UMR-CNRS 6213, Université de Bourgogne Franche-Comté 16 Route de Gray, 25030 Besançon Cedex, France. Electronic address: cedric.buron@univ-fcomte.fr.
authors.forename: C C
authors.initials: CC
authors.lastname: Buron
authors.affiliation: Institut FEMTO-ST, UMR 6174, CNRS UFC ENSMM UTBM, 32 avenue de l'Observatoire, 25044 Besançon Cedex, France.
authors.forename: N
authors.initials: N
authors.lastname: Martin
authors.affiliation: Institut UTINAM, UMR-CNRS 6213, Université de Bourgogne Franche-Comté 16 Route de Gray, 25030 Besançon Cedex, France.
authors.forename: C
authors.initials: C
authors.lastname: Filiâtre
keywords: Electrical conductivity; Multilayer; Optical reflectometry; PEDOT:PSS