Electron-phonon interaction and its influence on reconstruction of single-walled carbon nanotube radial breathing mode spectra

The relative electron-phonon interaction matrix elements (Mph) for 28 (n,m) semiconducting single walled carbon nanotubes (SWNTs) species were extracted from the resonance Raman cross sections of individually dispersed high-pressure CO SWNTs. The observed Mph pattern was fitted according to nanotube family [i.e., (2n+m) =const] and modality [i.e., mod (n-m,3) =1, or 2] using an empirical equation based on trigonal warping effects. The predicted Mph trends enabled significant improvement to the reconstruction of the radial breathing mode spectra, so that a better match was obtained to the experimental spectra for both dispersed and aggregated SWNTs. The latter provides an initial indication that the observed Mph trends are preserved during aggregation.