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

摘要

Magnetoresistance, Hall coefficient, and thermal diffusivity of new highhyphen;quality graphite films prepared by pyrolysis of a condensation polymer, poly(thinsp;phyphen;phenylenehyphen;1,3,4hyphen;oxadiazole) were measured. The total carrier density, mobility, and thermal conductivity were 1.6times;1019cmminus;3, 7400 cm2thinsp;Vminus;1thinsp;sminus;1, and 11 Wthinsp;cmminus;1thinsp;Kminus;1for the graphite film annealed at 3000thinsp;deg;C, which are almost comparable to those of highest quality graphites known so far. Drastic changes in the electronic and thermal properties with the heathyphen;treatment temperature were found and discussed in relation to the development of the highhyphen;quality graphite.