Unusual Raman dispersion for D and 2D lines in high-curvature single-walled carbon nanotubes revealed by C-13 isotope substitution
- Author(s)
- Ferenc Simon, Viktor Zolyomi, Rudolf Pfeiffer, Hans Kuzmany, János Koltai, Jenö Kurti
- Abstract
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 C-13 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.
- Organisation(s)
- Electronic Properties of Materials
- External organisation(s)
- Lancaster University, Eötvös Loránd University Budapest
- Journal
- Physical Review B
- Volume
- 81
- No. of pages
- 5
- ISSN
- 1098-0121
- DOI
- https://doi.org/10.1103/PhysRevB.81.125434
- Publication date
- 2010
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103015 Condensed matter
- Portal url
- https://ucris.univie.ac.at/portal/en/publications/unusual-raman-dispersion-for-d-and-2d-lines-in-highcurvature-singlewalled-carbon-nanotubes-revealed-by-c13-isotope-substitution(dde78d2d-b575-4a67-8448-744b8eb25452).html