Composites of Polybenzimidazole with SWCNTs – Temperature Dependences of Resistance

Electron transport in composites based on dielectric polymer of polybenzimidazole and single-walled carbon nanotubes (SWCNTs) has been studied. The composites were synthesized by flow coating of dispersions (colloidal systems) of SWCNTs in solutions of polybenzimidazole in N-methyl-2-pyrrolidone. Concentration of SWCNTs in the composites was 1, 2, and 3 % (wt.). Electron transport in the film samples of the composites was studied by measuring and analyzing temperature dependences of the electrical resistance of the composites in the range from cryogenic temperature to 300 °C. It was shown that the higher SWCNTs concentration the weaker the dependences were. That is most likely due to a more significant contribution of metallic SWCNTs to the conductivity and weaker dependences correspondingly.