Materials Chemistry and Physics, Vol.64, No.1, 37-40, 2000
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 degrees 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.