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

Autor(en)

Ferenc Simon, Viktor Zolyomi, Rudolf Pfeiffer, Hans Kuzmany, János Koltai, Jenö Kurti

Abstrakt

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(en)

Elektronische Materialeigenschaften

Externe Organisation(en)

Lancaster University, Eötvös Loránd University Budapest

Journal

Physical Review B

Band

81

Anzahl der Seiten

5

ISSN

1098-0121

DOI

https://doi.org/10.1103/PhysRevB.81.125434

Publikationsdatum

2010

Peer-reviewed

Ja

ÖFOS 2012

103015 Kondensierte Materie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/dde78d2d-b575-4a67-8448-744b8eb25452