Raman G and D band in strongly photoexcited carbon nanotubes

Pascal Puech (1) , Abdul Waheed Anwar (1) , Emmanuel Flahaut (2) , David J. Dunstan (3) , Ayman Bassil , Wolfgang Bacsa (1)

1 CEMES - Centre d'élaboration de matériaux et d'études structurales
2 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux
3 University of London [London]

We observe clear differences in the spectral shift of the Raman D and G bands when heating double wall carbon nanotubes through intense photon irradiation and by varying the temperature in a thermostat. These spectral differences are attributed to modifications of the defect induced double-resonance Raman process, and are consistent with Stokes–anti-Stokes anomalies observed for single and double wall carbon nanotubes, not present in graphite. We find that the Raman intensity for double wall carbon nanotubes increases superlinearly in the red spectral region and sublinearly in the UV spectral region.

Mots clés: carbon nanotubes; laser beam effects; Raman spectra; spectral line intensity; spectral line shift

Domaines: Matériaux

Pascal Puech, Abdul Waheed Anwar, Emmanuel Flahaut, David J. Dunstan, Ayman Bassil, et al.. Raman G and D band in strongly photoexcited carbon nanotubes. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2009, 79 (8), pp.085418-1. ⟨10.1103/PhysRevB.79.085418⟩. ⟨hal-03572890⟩