Electrochemical stability and repulsion of polypyrrole film

This study reports the electrochemical synthesis of polypyrrole (Ppy) film on the gold surface and the evaluation of this film repulsion conditions from the electrode surface. It is known that overall stability of the conducting polymer layer on the electrode is critical for many applications including biosensors. It can be affected by many factors however electrochemical treatment of electrode is mostly well-known among them. This work was mainly based on the preparation of the polymeric layer and the investigation of its stability. Overoxidised polypyrrole film was synthesized on the gold electrode. Later this layer was treated by potential cycling in wide potential intervals. The stability of Ppy layers deposited on electrode was evaluated. It was determined that Ppy layer was stable within 0-0.9 V potential range, scan rate was 20 mV/s, vs. Ag/AgCl/KClsat. while it was repulsed from the gold electrode by 10 potential cycles within 0.0-1.0 V potential range at the same scan rate. Some possible future applications of repulsed Ppy films are predicted. (C) 2012 Elsevier B.V. All rights reserved.