Physical insight in the in-situ self-assembled films of polypyrrole

The ultrathin films with nanometre control over thickness and multilayered structures of polypyrrole (PPY) were manufactured by in-situ self-assembled technique. A controlled thickness of PPY was deposited on polyanion, poly( styrene sulfonate) (PSS) surfaces as a function of time; previously PSS had been deposited on various substrates (glass, mica, indium-tin-oxide coated glass plates). Later, alternate PPY and PSS films were fabricated on such substrates by the layer-by-layer technique. The films were characterized by using UV-visible, electrochemical and Quartz Crystal Microbalance techniqu es. The resulting morphology of the manufactured films was investigated by Atomic Force and the Scanning Tunneling Microscopies. The electrochemical s urveying of self-assembled PPY films in different electrolytic media highli ghted the sensor application. Typical supramolecular films of PPY/PSS were found to have conductivity values in the range of 10(-2)-10(-1) S/cm. (C) 2 000 Elsevier Science Ltd. All rights reserved.