The polymerization and growth of polypyrrole film on Pt microdisc electrode in nitrate solutions were investigated. The enhanced mass transport properties at microelectrodes have been used to prove the formation of soluble oligomeric intermediates during polymer growth. The experimental results show that the polymerization current of pyrrole monomer depends on its concentration, anodic potential and pH of solutions. The cyclic voltammetry, potential step and single sweep experiments were used to investigate the polymerization mechanism.

Key words: VOLTAMMETRY, REACTION MECHANISM, POLYMERIZATION, CHEMICAL MODIFIED ELECTRODE, PYRROLE, SODIUM NITRATE, MICROELECTRODE, POLYPYRROLE