Index assignment of a carbon nanotube rope using tip-enhanced Raman   spectroscopy
  We used tip-enhanced Raman spectroscopy to study the diameter-dependent Raman modes in a contacted carbon nanotube rope. We show that with the near-field tip enhancement a large number of nanotubes within a rope can be identified, even if the nanotube modes can not be distinguished in the far-field signal. Several metallic and semiconducting nanotubes can be identified and assigned to nanotube families. Additionally, we provide a tentative chiral index assignment. 
Karin Go{\ss}, Niculina Peica, Christian Thomsen, Janina Maultzsch,   Claus M. Schneider, Carola Meyer
cond-mat.mes-hall cond-mat.mtrl-sci