The influence of molecular-organization on charge transport in electrochemically prepared polypyrrole films

Mitchell, G.R., Cywinski, R., Mondal, S. and Sutton, Simon (1989) The influence of molecular-organization on charge transport in electrochemically prepared polypyrrole films. Journal of Physics D: Applied Physics, 22 (8), 1231-1234.

Abstract

Letter to the editor. Electrical conductivity data is presented for two types of polypyrrole film prepared using toluene sulphonate and sulphate as the counter-ions or dopant. The films based on polypyrrole and toluene sulphonate exhibit an ordered molecular organisation in which the planes of the aromatic units lie preferentially parallel to the film surface. For such films the conductivity versus temperature data fit to a 2D variable range hopping model. In contrast, films using SO42- as the dopant show an isotropic highly disordered molecular organisation and a temperature dependence of the electrical conductivity which fits a 3D variable range hopping model. Although such models present a rather simple picture of conductivity in these complex molecular composites, they do demonstrate the strong and direct influence of the molecular organisation on their electrical transport properties.

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