DOPING DEPENDENT TRANSPORT-PROPERTIES OF POLYANILINE-CSA FILMS

Polyaniline films prepared via the camphorsulfonic acid (CSA)/m-cresol solution processing route have been synthesised with doping levels in the range 10 to 90 %. The electrical conductivity of these films has been measured as a function of temperature between 10 and 300 K. Films with a doping level of over 30 % are seen to exhibit metallic conduct ivity, with the 60 % doped films having metallic characteristics down to 135 K and room temperature conductivities of 300 +/- 30 Scm(-1). Th e conductivity of stretch oriented 60 % doped films has also been stud ied as a function of temperature, with a peak conductivity measured as 583 Scm(-1). The results are modelled in terms of a heterogeneous mod el of fluctuation induced tunnelling (FIT) and metallic transport.