Effect of preparation conditions on the two doping structures of polypyrrole

The effect of electrolyte concentration of the polymerization solution and temperature on the two doping structures, conjugated chain doped with counter-anions (1) and proton-acid doping structure (2), of polypyrrole nitrate films was investigated via elemental analysis and cyclic voltammetry. It was found that the doping degree of 1 increased with increase of NaNO3 concentration in its polymerization solution and with decrease of temperature. 2 is easily formed in low electrolyte concentration and at higher temperature.