Enrichment of armchair carbon nanotubes via density gradient ultracentrifugation: Raman spectroscopy evidence.
Hároz EH, Rice WD, Lu BY, Ghosh S, Hauge RH, Weisman RB, Doorn SK, Kono J. Enrichment of armchair carbon nanotubes via density gradient ultracentrifugation: Raman spectroscopy evidence. ACS Nano. 2010 Apr 27; 4(4):1955-62.