Unique Electrical and Magnetic Properties of Pyrolyzed Poly(hydrazocarbonyl-1,4-phenylenecarbonyl) Film

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Abstract
Graphitelike films with high conductivity exceeding 1.6×104 S/cm have been newly prepared by pyrolysis of poly(hydrazocarbonyl-1,4-phenylenecarbonyl) films (PHP) at 2800°C. Pyrolyzing processes have been examined by means of X-ray diffraction, thermoelectric power (TEP), and electron spin resonance (ESR) measurements. The rapid increase of conductivity similiar to that of soft carbon and the three-dimensional ordering of crystallites occurred in the heat treatment temperature (HTT) range of 1700-2000°C. The unusual ESR characteristics observed in the range of low HTT (≤1000°C) may be caused by oxygen radicals evolving in the molecular structure of pyrolyzed PHP films.