Electrical conductivity response of polypyrrole to acetone vapor: effect of dopant anions and interaction mechanisms

The chemically prepared undoped polypyrrole (PPy) and the PPy doped with seven dopant anions, at a dopant to monomer molar ratio of 1/12, were used as chemical sensors to detect acetone vapor. The negative changes in specific conductivity, Δσ, of PPys upo