Polypyrrole: Synthesis and electronic device application

Abstract

AbstractA Ta solid electrolytic capacitor using conducting polypyrrole as a counter electrode has been developed by means of the direct film formation of electrochemical and chemical polymerization methods. Two‐step electrochemical polymerization at a rapid and gentle rate yields a polypyrrole film on the dielectric surface of the capacitor. On the other hand, the homogeneous mixture dissolving pyrrole and oxidant under −70 °C allows chemical polymerization at elevated temperature, which also produces polypyrrole film on the dielectric surface. The capacitors produced by these methods demonstrate the improved characteristics, i.e., a high capacitance, low inner resistance and small leakage current, that correspond to the high‐speed electronic devices.