The present teachings provide methods for providing populations of single-walled carbon nanotubes that are substantially monodisperse in terms of diameter, electronic type, and/or chirality. Also provided are single-walled carbon nanotube populations provided thereby and articles of manufacture including such populations.
 The United States Government has certain rights to this invention pursuant to Grant Nos. EEC-0118025 and DMR-0134706 from the National Science Foundation and Grant No. DE-FG02-00ER54810 from the Department of Energy, all to Northwestern University.