Abstract

Multiwall Carbon Nanotubes (MWNT’s) prepared by the electric arc method and purified by oxidation in air, have been studied in Raman spectroscopy. Low frequency vibrational modes are unambiguously identified, thanks to their small internal diameters. We have built a model showing that these modes originate from the radial breathing vibrations of individual tubes which are coupled by Van der Waals interactions between adjacent walls. Using a bond polarization theory, we have derived the relative intensity of these modes, introducing structural characteristics obtained in transmission electron microscopy such as the diameter of the internal tube, as well the average number of tubes constituting the MWNT’s.

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