The dc and ac conductivity of polyaniline-polyvinyl alcohol blends

The de and ac conductivity of polyaniline (PANI)-polyvinyl alcohol (PVA) blends have been reported from room temperature to 80 K in the frequency range of 1 kHz-5 MHz. The de conductivity has been described by the variable range hopping (VRH) model. The large value of VRH exponent (>0.5) indicates that hopping transport occurs between the superlocalised states of polymer. The frequency (omega) dependence of conductivity satisfies the omega (5) power law. The variation of s with temperature suggests that the ac conduction is due to the correlated barrier hopping (CBH). The onset frequency omega (0) is proportional to sigma (0). The permittivity increases sharply at low frequency and high temperature. (C) 2001 Elsevier Science B.V. All rights reserved.