ELECTRICAL-CONDUCTION IN POLYANILINE COMPRESSED PELLETS DOPED WITH ALKYLBENZENESULFONIC ACIDS

Anion dependent processes of the electrical conduction in chemically prepared polyaniline compressed pellets doped with alkylbenzenesulfonate anion of alkyl chain length 1, 8, and 12 have been investigated by the measurement of the temperature dependence of the conductivity. The conductivity of the samples changes with the temperature as T-1/2, which shows the conduction followed a one dimensional variable range hopping process. With the increase of the alkyl chain length of the dopant anion, the conductivity of the heavily doped 50 mol % sample decreases in whole temperature range, but an exponential factor of the variable range hopping remains unchanged. The results concerning the alkyl chain length of the dopant anion have been discussed from the "quasi-one dimensional" variable range hopping mechanism and demonstrated the decrease of the transverse localization length and the interchain transfer integral of electron.