Studies on “Mesophase”-Pitch-Based Carbon Fibers, Part III. Intercalation of Sulfuric Acid

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Abstract
Four kinds of “mesophase”-pitch-based carbon fibers with different textures in their cross-sections were used as host materials for graphite intercalation compounds with sulfuric acid. Sulfuric acid could intercalate into only fibers having positive value of magnetoresistance by chemical oxidation with nitric acid. This seemed to be a criterion for the intercalation. The potential change during the intercalation was found to depend on texture of fibers; the ones with radial texture increasing their potentials rapidly, probably due to their large edge surface area of graphite structure, and the ones with concentric texture showing stepwise increase of potential, almost the same as the case of flaky natural graphite powder with a large particle size.

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