Electrical conductivity of polyazomethine/reduced graphene oxide nanocomposites

We produced nanocomposites comprised of polyazomethine and reduced graphene oxide by solution mixing. The nanofiller concentration ranged from 0.25 to 1.5 wt.%. Both neat polymer and nanocomposites samples were investigated using broadband dielectric spectrometry under the same conditions. The electrical conductivity σ of the samples was examined as a complex value being a combination of two parameters: dc conductivity (σdc) and ac conductivity (σac). The temperature dependences of σac were found to follow the Arrhenius equation, whereas the frequency dependences of σac were shown to obey a power law. We proposed that the correlated barrier hopping could explain behaviour of σac of the nanocomposites under study.