Berlin 2005 – scientific programme
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CPP: Chemische Physik und Polymerphysik
CPP 27: Nano tubes and fibres
CPP 27.1: Talk
Tuesday, March 8, 2005, 14:00–14:15, TU C243
Chirality dependence of electronic and vibrational properties in carbon nanotubes: a resonant Raman study — •Hagen Telg1, Janina Maultzsch1, Maria Machón1, Stephanie Reich2, Christian Thomsen1, and Frank Hennrich3 — 1Institut für Festkörperphysik, Technische Universität Berlin, Germany — 2Department of Engineering, University of Cambridge, United Kingdom — 3Institut für Physikalische Chemie, Universität Karlsruhe, Germany
Many technological applications of carbon nanotubes require the knowledge of
the exact helical structure of the tubes applied. Using resonant Raman
techniques we assigned the low energy Raman modes, the so called
radial breathing modes (RBM), and the optical transition energies to specific
nanotube structures (n1,n2) [1]. Based on this assignment, which for the
first time includes metallic nanotubes, we analyzed the
Raman cross section as a function of various structural properties like the
chiral angle or the nanotube family ν=(n1−n2) mod 3. We also
observed deviations of the linear relation between the tube diameter and the
inverse RBM frequency and an influence of the solvent the nanotubes were
dispersed in. Our experimental results agree well with predictions
from theory.
We extended our resonant Raman measurements to the other vibrational modes of
carbon nanotubes with regard to the assignment made.
[1] H. Telg et al., Phys. Rev. Lett. 93, 177401 (2004)