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

F. Simon, V. Zólyomi, R. Pfeiffer, H. Kuzmany, J. Koltai, J. Kürti

Research output: Article

9 Citations (Scopus)

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.

Original languageEnglish
Article number125434
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume81
Issue number12
DOIs
Publication statusPublished - márc. 26 2010

Fingerprint

D lines
Excitation energy
Single-walled carbon nanotubes (SWCN)
Isotopes
Substitution reactions
isotopes
carbon nanotubes
curvature
substitutes
Carbon Nanotubes
Laser excitation
Optical transitions
tubes
Nanostructured materials
Nanotubes
Raman scattering
Carbon nanotubes
Carbon
Defects
energy

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

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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.",
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T1 - Unusual Raman dispersion for D and 2D lines in high-curvature single-walled carbon nanotubes revealed by C 13 isotope substitution

AU - Simon, F.

AU - Zólyomi, V.

AU - Pfeiffer, R.

AU - Kuzmany, H.

AU - Koltai, J.

AU - Kürti, J.

PY - 2010/3/26

Y1 - 2010/3/26

N2 - 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.

AB - 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.

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