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D-band Raman Spectra of Graphite and Single Wall Carbon Nanotubes

  • R. Saito (a1), A. Grueneis (a1), L. G. Cançcado (a2), M. A. Pimenta (a2), A. Jorio (a3), A. G. Souza Filho (a4), G. Dresselhaus (a5) and M. S. Dresselhaus (a3) (a6)...

Abstract

The double resonance Raman spectra of the disorder-induced D-band and some other non-zone-center phonon modes are discussed for two-dimensional (2D) graphite and to some extent for single wall carbon nanotubes (SWNTs). The phonon dispersion relations of graphite can be determined using Raman spectroscopy b y measuring the non-zone center Raman phonon frequencies in combination with theoretically determined phonon q-vectors. We report a t of the phonon dispersion relations to experimental Raman spectra which were previously observed but have not y et been assigned to speci c phonon branches. We found that the D-band and the G0-band of 2D graphite consist of, respectively, two and one Raman Lorentzian peaks, while 3D graphite shows two G0-band Lorentzian peaks. The appearance of two G0 peaks in the resonance Raman spectra of SWNTs may come from resonances of one laser line with two di erent van Hov e singularities.

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