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Fig. 5


Raman spectra of a sample set of planetary ball-milled graphite under a pressurised hydrogen atmosphere in function of milling time. The millings were performed in bowls made of stainless steel, hardened steel, tungsten carbide, and zirconium oxide. The Raman intensities were normalised. A graphite chunk and carbon nanopowder were measured for comparison. The spectra recorded for hydrogenated multi-layer graphene (Ilyin et al. 2011) and graphene nanoribbons (Jovanović et al. 1996) are displayed.

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