Influence of polymerization conditions on morphologies of polypyrrole

Using a needle-circle electrode configuration, we investigated the relationship between morphologies of polypyrrole (PPy) and polymerization conditions, such as the kinds of electrolyte, solvent and electrode, the concentrations of electrolyte and monomer, the applied voltages, etc. The various morphologies of PPy are classified into seven types. The influence of the substrate was also taken into account. Four types of morphologies of PPy under the mica are shown. We recently obtained organized PPy particles by the induction of the mica substrate. The neuron network-like interconnections of PPy fabricated by controlling the polymerization conditions are shown.