Effect of protonic acids on the dielectric spectroscopy of polyaniline

A comparative study of effect of protonic (hydrochloric, sulphuric and phos phoric) acids doping on dielectric constant (epsilon '(omega)), measured ac conductivity (sigma (m)(omega)) and dc conductivity (sigma (dc)) of polyan iline has been carried out in the temperature range 77-410 K. The ratio of measured ac to dc conductivity shows dispersion at 77 K which decreases wit h increase in the doping level for all the protonic acids. The correlation of dielectric relaxation and de conductivity data suggests that both origin ate from the same hopping mechanism.