Laser Raman spectra were studied of natural graphite (SP-1) and carbonaceous materials including pyrolytic graphite, carbon black, glassy carbon, coal, “white” carbon and sputtered carbon. All of these carbons have two Raman bands at 1580 cm−1 and 1360 cm−1, except for natural graphite which has a single sharp Raman band at 1580 cm−1. The relative intensity of the 1360 cm−1 band to the 1580 cm−1 band and the half band width increase going from graphite through glassy carbon to carbon black. The 1360 cm−1 band in glassy carbon becomes sharper and stronger with the increase of heat-treatment temperature (HTT), while the addition of iron to the glassy carbon matrices results in a decrease in intensity and half band width of this band with increasing HTT and iron content. Sputtered carbon and “white” carbon, prepared from graphite irradiated by a high power laser, showed an additional broad band around 2140cm−1. This band is believed to originate from conjugated acetylenic bands (—CC—)n.
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