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ELECTRON SPIN RESONANCE AND DC ELECTRICAL INVESTIGATIONS ON CHLORINE DOPED POLYANILINES

M. Chipara1,* , Gh. Aldica2, D. Hui3, M. Dimonie4, K. T. Lau5, L. Georgescu6, I. Munteanu6, H. Marascoiu4

Affiliation

  1. Indiana University Cyclotron Facility, Bloomington, Indiana, USA
  2. National Institute for Materials Physics, Magurele, Bucharest, Romania
  3. University of New Orleans, Department of Mechanical Engineering, USA
  4. “Politehnica” University, Polymer Chemistry Department, Bucharest Romania
  5. The Hong Kong Polytechnic University, Department of Mechanical Engineering, Hong Kong
  6. University of Bucharest, Faculty of Physics, Magurele, Bucharest, Romania

Abstract

Electron spin resonance and DC electrical investigations on the effect of chlorine doping on emeraldine base polyaniline are reported. From the experimental data it is concluded that the chlorine doping of polyanilines increases the conductivity and that the charge transport is well described by an one dimensional variable range hopping, up to a doping level of 15% Cl/N. The characteristic temperature rises as the doping level is increased. Electron spin resonance investigations revealed the contribution of polarons to the charge transport. The absence of high spin bipolarons was proved by electron spin resonance data within the experimental errors. At high doping levels, the mesoscopic nature of charge transport in polyanilines is confirmed by the Dysonian shape of the resonance lines..

Keywords

Electron spin resonance, Polyaniline, Doping, DC electrical conductivity, Variable range hopping.

Submitted at: Sept. 30, 2003
Accepted at: March 15, 2004

Citation

M. Chipara, Gh. Aldica, D. Hui, M. Dimonie, K. T. Lau, L. Georgescu, I. Munteanu, H. Marascoiu, ELECTRON SPIN RESONANCE AND DC ELECTRICAL INVESTIGATIONS ON CHLORINE DOPED POLYANILINES, Journal of Optoelectronics and Advanced Materials Vol. 6, Iss. 1, pp. 297-305 (2004)