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Unusual Raman dispersion for D and 2D lines in high-curvature single-walled carbon nanotubes revealed by C-13 isotope substitution

Research output: Contribution to journalJournal article


  • F. Simon
  • V. Zolyomi
  • R. Pfeiffer
  • H. Kuzmany
  • J. Koltai
  • J. Kurti
Article number125434
Journal publication date1/03/2010
JournalPhysical review b
Number of pages5
Original languageEnglish


The defect-induced D line and its overtone are fundamental signatures in the Raman spectra of carbon nanomaterials. An analysis of these lines as a function of laser excitation energy is reported for double-walled carbon nanotubes where the inner tubes represent high-curvature nanotube species. From 13C substituted inner tubes it is demonstrated that the quasilinear relations between laser energy and line position (Raman dispersion) cross over unexpectedly for low-energy excitation for the inner and outer tube shells. The result is quantitatively explained by a curvature-induced phonon softening and first-principles calculations of the optical transition energies.

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© 2010 The American Physical Society