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SYNA: Carbon Nanotubes

SYNA VII: HV VII

SYNA VII.1: Invited Talk

Thursday, March 30, 2000, 16:30–17:00, H20

Structural Analysis of Single-Wall Carbon Nanotubes by Raman Scattering — •Hans Kuzmany¹, Martin Hulman¹, Wolfgang Plank¹ und Jenoe Kürti² — ¹Institut für Materialphysik, Universität Wien,A-1090 Wien, Austria — ²Department of Biological Physics, Eötvös University, H-1088 Budapest, Hungary

Resonant Raman scattering is an excellent tool to characterize single-walled carbon nanotubes with respect to their diameter, metallicity, and helicity. After a short introduction this talk will demonstrate that scattering from the radial breathing mode (RBM) is especially suited for such an analysis. Contrary to original expectations, the analysis shows that the Raman response corresponds to a quasi-continuous distribution of tube diameters, in which all tubes geometrically allowed in the relevant diameter region follow a Gauss distribution. In agreement with calculated spectra the photoselective resonance exhibits an oscillatory behavior in frequency and intensity. The interaction between the tubes in a rope leads to a stiffening which was found to amount to 8.5% of the frequency of the RBM.