Disorder induced Raman scattering of nanocrystalline carbon

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Abstract
Weak, low frequency disorder induced Raman scattering is observed in nanocrystalline, ‘‘glassy’’ carbon having an in-plane correlation length La≂30 Å. Similar, relatively more intense low frequency scattering is observed after the annealing of amorphous carbon films to 600 °C, suggesting the formation of quite small nanocrystallites of diameters estimated to be in the range of 10–15 Å. A comparison with the glassy carbon inelastic neutron scattering spectrum demonstrates that the Raman spectra represent a weighted phonon density of states of low frequency modes. The results confirm theoretically predicted low frequency, disorder induced scattering from nanocrystalline solids.

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