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Raman spectroscopy is used to characterize the fiber surface of graphite and carbon fibers. A correlation exists between the Raman spectrum of the fiber surface and the shear strength of the com posite. Effects of surface treatments are reflected in the Raman spec trum as well as the shear strength of the composite. Many graphite fibers have a weak surface layer where the graphite planes are oriented parallel to the surface.
Tuinstra et al. (Thu,) studied this question.