2005•Journal of Nanjing University of Science and TechnologyRequires access

Electrochemical Behavior and Surface Morphology of Conducting Polypyrrole

Xin Wang

Abstract

Polypyrrole films were obtained by electrochemical polymerization from aqueous pyrrole solution, with TsOH, TsONa, LiClO_4, KHSO_4, Na_2SO_4, Cl_2SONa as the supporting electrolytes respectively. Electrochemical behavior of polypyrrole films was studied by cyclic voltammetry(CV) and electrochemical impedance spectroscopy(EIS). It showed that different dopants and polymerization time had a great influence on EIS curves . Surface morphology of PPy films was characterized with scanning electron microscopy (SEM). It was observed that the polymerization time and the current density had a crucial influence on surface morphology of PPy films. Long polymerization time and low current density made the surface of PPy films smooth and fine. On the contrary, the surface morphology of PPy films was coarse and loose. The optimum conditions were 20 min of polymerization time and 100 μA/cm~2 of current density.

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Key concepts: Polypyrrole, Polymerization, Materials science, Dielectric spectroscopy, Scanning electron microscope, Cyclic voltammetry, Chemical engineering, Morphology (biology)