TEMPERATURE AND PRESSURE-DEPENDENCE OF CONDUCTIVITY OF POLYANILINE SYNTHESIZED BY IN-SITU DOPING POLYMERIZATION IN THE PRESENCE OF ORGANIC FUNCTION ACID AS DOPANTS

Temperature and pressure dependence of polyaniline doped with beta-nap hthalenesulfonic acid (NSA) were measured as a function of its morphol ogy. The temperature dependence of the conductivity for both granular and tubular PANI-NSA can be interpreted within the one dimensional var iable range hopping (1D-VRH) model. The To value corresponding to the hopping barrier of charge carrier, for the tubular PANI-NSA is much lo wer than that of the granular PANI-NSA due to the regularity of tubule s. The pressure dependence of the conductivity of the tubular PANI-NSA shows a maximum near 6 Kbar and then decreases, a fact which may be d ue to the break down of tubules when high pressure is applied. On the other hand the conductivity of the granular PANI-NSA increases constan tly with increasing applied pressure due to the decrease in inter-gran ular resistance when pressure is applied. (C) 1998 Elsevier Science Lt d. All rights reserved.