Electrical and thermal properties of new pyrographite films based on a condensation polymer, polyoxadiazole

Abstract

Magnetoresistance, Hall coefficient, and thermal diffusivity of new high-quality graphite films prepared by pyrolysis of a condensation polymer, poly( p-phenylene-1,3,4-oxadiazole) were measured. The total carrier density, mobility, and thermal conductivity were 1.6×1019 cm−3, 7400 cm2 V−1 s−1, and 11 W cm−1 K−1 for the graphite film annealed at 3000 °C, which are almost comparable to those of highest quality graphites known so far. Drastic changes in the electronic and thermal properties with the heat-treatment temperature were found and discussed in relation to the development of the high-quality graphite.