Enrichment of Armchair Carbon Nanotubes via Density Gradient Ultracentrifugation: Raman Spectroscopy Evidence

• DOI: 10.48550/arxiv.0911.0904
• Publication Date: 2009-01-01
• Authors: Erik H. Hároz; William Rice; Benjamin Y. Lu; Shankar Ghosh; Robert H. Hauge; R. Bruce Weisman; Stephen K. Doorn; Junichiro Kono
• Keywords: Density gradient; Analytical Ultracentrifugation; Carbon fibers

We have used resonant Raman scattering spectroscopy to fully analyze the relative abundances of different (n,m) species in single-walled carbon nanotube samples that are metallically enriched by density gradient ultracentrifugation. Strikingly, data clearly show our ultracentrifugation process enriches metallic fractions armchair and near-armchair species. observe nanotubes constitute more than 50% each (2n + m) family.