Polypyrrole doped by p-tolyl sulfonic acid was chemically synthesized from pyrrole using p- tolyl sulfonic acid as a doping agent and ferric chloride as an oxidant. The effect of dosage of the doping agent and the oxidant on the conductivity of doped polypyrrole was investigated, and the optimized condi- tions were obtained. The molecular structure of the polypyrrole was characterized by UV and IR spectra, and its morphology was studied by SEM. The results indicated that the polypyrrole was regular, and its...