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.
@article{arxiv.1105.4427,
title = {Index assignment of a carbon nanotube rope using tip-enhanced Raman spectroscopy},
author = {Karin Goß and Niculina Peica and Christian Thomsen and Janina Maultzsch and Claus M. Schneider and Carola Meyer},
journal= {arXiv preprint arXiv:1105.4427},
year = {2012}
}