High-modulus and high-strength carbon fibers were submitted to oxidation plus sizing and grinding treatments. Subsequent changes at the fiber surfaces were studied by Raman spectrometry. X-ray diffractograms and Raman spectra of the fresh fibers were compared with those of other carbon materials with different graphitization degrees. The industrial oxidation + sizing treatment induces disorder at the fibers surface, this being of a higher order of magnitude than that introduced by grinding. However, this disorder is different in nature from the intrinsic disorder typical for little graphitized carbon materials.
A. Cuesta, P. Dhamelincourt, J. Laureyns, A. Martinez-Alonso, and J. M. D. Tascon, "Effect of Various Treatments on Carbon Fiber Surfaces Studied by Raman Microprobe Spectrometry," Appl. Spectrosc. 52, 356-360 (1998)