Journal
SYNTHETIC METALS
Volume 157, Issue 8-9, Pages 336-342Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.synthmet.2007.03.013
Keywords
polyaniline; vapor-phase polymerization; nano-films; polycrystalline
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We succeeded in the chemical preparation of nano-level thick polyaniline (PANI) emeraldine salt films on plastic substrate by an in situ vapor-phase deposition (VDP) polymerization method under ambient conditions, using a self-assembly method which is unprecedented. Homogeneous conductive PANI thin films were uniformly fabricated at nano-level thickness (20-100 nm), but their morphologies could grow as polycrystalline grains of a highly ordered structure, depending on the deposition conditions. The grain size was also controlled between 30 and 100 mu m depending on the deposition time/temperature. The surface resistance of PANI films was enhanced up to 10(4) Omega/square with crystallization and light transmittance was increased up to 90% in the case of a film less than 30 nm thick. A typical spectrum for the oxidized PANI, the emeraldine salts form, showing pi-pi* transition and a polaron lattice were observed by UV-visible/IR and infrared /Raman spectroscopy. (c) 2007 Elsevier B.V. All rights reserved.
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