Temperature dependence of conductivity in polyacrylonitrile-based carbon fibrils: heterogeneous model

An anomalous temperature dependence of carbon fibrils’ electric conductivity in the range of 11–320 K is considered. The fibrils are prepared from polyacrylonitrile by heat-treatment at 1400°C. Our conjecture is that in these carbon fibrils different phases coexist. A heterogeneous model is developed and a good fit to the experimental temperature dependence of the conductivity of our fibrils is obtained.