3.7.2. A.C. conductivity
The basis electrical conductivity in the conducting polymers is
mainly due to the movement of delocalised electrons through
the polymer backbone systems and at the same time hopping
of electrons between the nearest neighbour redox sites on the
polymer chain. The frequency dependent conductivity (r(f))
of PANI(DBSA)/PVA systems for two temperatures is shown
in Fig. 8. Almost similar trends in the r(f) are seen for all the
blend samples, except there is a significant increase in conductivity
values with increase in aniline concentration in the blend.
For low temperature 200 K for all the blend samples there was
no change in the r(f) up to 102 Hz, and a rapid increase is
observed after this frequency. This rapid increase in r(f) is
due to increase in hopping of the electrons at relatively high
frequencies. Similar trends are observed for all the blends;
however, beyond the frequency 106 Hz the increase seen in
the r(f) became slower. The frequency dependent conductivity
at room temperature 300 K shows increase in r(f) with frequency,
without any significant changes unlike at low