Abstract
A highly conductive graphite fiber was prepared by chemical vapor deposition of cyanoacetylene (CA) on a carbon fiber substrate, followed by heat treatment. In order to discuss the graphitization process, the inhomogeneity of residual strain of the graphite fiber was investigated from the analysis of X-ray peak width. Peak analysis of 00 l reflections by use of Hall's method reveals that inhomogeneous strain decreases with increasing heat treatment temperature (HTT), and reaches to 5.0×10 −4 (or ± 35 K) at HTT 3000°C. The structural changes of HNO 3-intercalated graphite fibers prepared from CA were studied in air. HNO 3-graphite fiber from CA (HTT 3000°C) changes the structure from α-stage 3 ( Ic=14.50 A ̊ : di=7.80 A ̊ ) to β-stage 3 ( Ic=13.25 A ̊ : di=6.55 A ̊ ) in 8h after exposure to air, and retain β-stage 3 over 6 months. While, fibers from benzene are unstable in air and are transformed to mixed structure with pristine graphite and higher stage compounds in 1 month. It is suggested that residual nitrogen atoms in the graphite fibers (0.2 wt% even at HTT 3000°C) contribute to the structural stability of HNO 3-graphite fiber from CA.
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