Pyrolytic carbon films were produced at temperatures between 728 and 1100 °C on macor substrates. Scanning electron microscopy Indicated that film morphology varied with temperature and that the most adherent films were obtained at 926 °C. Increases In pyrolysis time resulted In thicker, less adherent films. Rate of charge transfer were determined via cyclic voltammetry for the ferrl/ferrocyanlde redox couple. Films generated at 728 °C exhibited sluggish charge-transfer kinetics. Films fabricated at other temperatures displayed rate constants between 3.8 and 15.4 X 10"* cm/s. Electrode capacitance decreased with Increased pyrolysis temperature. Film formation did not occur on quartz substrates unless pyrolysis temperatures were In excess of 783 °C. Two distinct types of film were formed on quartz, depending on pyrolysis temperature. Rates of charge transfer for both types of film were similar to those obtained for macor-based films, but electrode capacitance was significantly higher for one of the film types. Films obtained on quartz at any temperature were much less adherent than those formed on macor.
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