MICRO-RAMAN SPECTROSCOPIC MEASUREMENTS ON CARBON-FIBERS

High-module pitch-based carbon fibers of about 10 mu m thickness (prod uced in Russia) with a heat-treatment temperature of 3000 degrees C an d their intercalated compounds have been investigated by Raman spectro scopy with an optical microscope. The first-order and the second-order Raman spectra of pristine fibers did not differ significantly from th ose of highly oriented pyrolytic graphite samples with a high level of order. The resistivity of the fibers at room temperature was decrease d by a factor 7 as a result of bromination, The bromine-intercalated f ibers were stable in air up to 100 degrees C. Micro-Raman spectroscopy was used for control of the intercalation process and determination o f the degree of order in pristine and intercalated carbon fibers with the aim of optimizing the intercalation time for these types of fibers .