The polybenzidine has been synthesized by thermal method and characterized by X-ray diffraction and infrared absorption studies. Further, polybenzidine has been doped with nitrate, sulfate and acetate ions. The electrical conductivity behavior of doped and undoped polybenzidine has been studied for various concentrations of dopants between room temperature and 200°C. All these polymers were found to behave like semiconductors. The activation energies of all the samples within the semiconducting region are estimated and analysed with the variation in dopant concentration. The results are explained with the effective charge formation due to ion pair association.

Keywords: Polybenzidine, dopants, semiconductors

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