ELECTROCHEMICAL SYNTHESIS OF METALLIC POLYPYRROLE FILMS

Doped polypyrrole (PPy) is one of the promising polymeric materials fo r electrical and electrochemical applications. High quality polypyrrol e films with high room temperature conductivity (sigma > 300 S/cm) wer e obtained by electrochemical synthesis in the presence of hexafluorop hosphate (PF6) salt. The electrical transport properties of PPy-PF6 we re optimized by the control of synthetic conditions such as polymeriza tion temperature (T-p), current density (J(p)), and total charge passe d during polymerization (Q). The controlled electropolymerization at l ow temperature results in metallic polypyrrole films exhibiting positi ve temperature coefficient of resistivity under 15 K. The extent of di sorder presented in the material was characterized by the partial crys talline structure observed by X-ray diffraction experiment, and compar ed with transport data.