Effects of aggregation and electron-phonon interactions on RBM spectral reconstruction of single walled carbon nanotubes

We present a methodology to reconstruct the radial breathing mode (RBM) region of the resonance Raman spectra of single walled carbon nanotubes (SWNTs) in isolated and aggregated states. This methodology takes into account the experimentally determined electron-phonon matrix elements (M_ph) along with an energetic deviation term (A£). In the case of isolated SWNTs, ΔE was found to be zero, while the RBM spectral reconstruction was insensitive to variations of the electron-phonon matrix elements. On the other hand, incorpration of a non-zero ΔE value and M_ph values corrected for diameter and chiral angle dependence through trigonal warping effects was necessary in order to obtain optimum RBM spectral reconstruction for aggregated SWNT samples.