Abstract
A simple precipitation method was employed to synthesise Nickel Oxide (NiO) nanoparticles and in-situ polymerization method was employed to synthesise Polyaniline (PANI) and PANI/NiO nanocomposites. To investigate the charge transport mechanism, DC and AC conductivity studies have been carried out. The drastic decrease in DC conductivity by two orders with an addition of NiO is noticed. Impedance and AC conductivity characteristics of these composites were examined in the frequency ranging from 10 Hz to 8 MHz. All samples obey Jonscher's Power law of disordered material at higher frequencies. The values of dielectric constant as well as dielectric loss decreased with an increase in applied frequency for all the samples. The samples show non-Debey relaxation mechanism verified by Havriliak – Negami model. Composite sample 5 wt % NiO show low tangent loss behaviour which are of importance in high frequency device applications. The obtained results are promising applications for energy storage applications and organic electronic devices.
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