Raman Study on Carbonaceous Materials Prepared by Mechanical Milling

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Abstract
Through Raman spectroscopy studies, we show that mechanical grinding generates an increasing amount of unorganized carbon at a rate depending on the type of grinding mode used (Shear and Shock-type grinding). The first-order Raman spectrum for pure unground graphite has a well-known G sharp band at 1579 cm -1, which corresponds to the E 2g vibration while the ground samples present a broadened G band accompanied by new components at about 1610 cm -1 (D′), 1510 cm -1 (D″) and 1348 cm -1 (D), usually explained as arising from disorder and defects 1. Shock-type grinding produces a faster disorder increase than shear-type grinding. The latter preserves part of the graphitic character. The general effect of mechanical milling remains however opposite to that of Thermal Treatment (Graphitization). © 1998 OPA (Overseas Publishers Association) Amsterdam B.V. Published under license under the Gordon and Breach Science Publishers imprint