Anisotropy of Electric Conductivity of Carbon and Graphite Films Derived from Kapton-type Polyimide
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Carbon and graphite films were prepared from the laboratory-made Kapton-type polyimide film, and the electric conductivities parallel, σ<SUB>//</SUB>, and perpendicular, σ<SUB>⊥</SUB>, to the surface were measured at room temperature. Anisotropy of electric conductivity was observed even for the 700°C treated film and the ratio, σ<SUB>//</SUB>/σ<SUB>⊥</SUB>, increased with raising heat treatment temperature (HTT). The carbon films formed at HTT=1200-1600°C showed nearly the same conductivity, and σ<SUB>//</SUB>/σ<SUB>⊥</SUB> in this range was 450-550. The conductivities and sailla σ<SUB>//</SUB>/σ<SUB>⊥</SUB> ratio increased with further raising HTT up to 2800°C. The structural changes of the films were also investigated by using XRD and TEM.
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