Raman study on single-walled carbon nanotubes and multi-walled carbon nanotubes with different laser excitation energies

In this report, the Raman spectra of single-walled carbon nanotubes (SWCNTs) and multi-walled carbon nanotubes (MWCNTs) were studied with different laser excitation energies (325, 514.5 and 1064 nm). The experimental results provide that the relative Raman intensities to the tangential stretching mode (G-mode) of the disorder mode (DM) for SWCNTs (ID/IG) hardly decrease with increasing laser excitation energy, but ID/IG of MWCNTs decreases with slope 0.3 eV−1 with increasing laser excitation energy. This may provide important information for the difference of DM between SWCNTs and MWCNTs.