title: Selective bundling of zigzag single-walled carbon nanotubes.
abstract: A simple, high throughput fractionation procedure for aqueous/SDS (sodium dodecyl sulfate) suspensions of single-walled carbon nanotubes (SWNTs) is presented, which yields thin bundles of semiconducting-SWNTs with small chiral angles. To demonstrate this we show the photoluminescence signatures of nanotube suspensions that contain almost exclusively zigzag and near-zigzag tubes. Starting suspensions and resulting fractions were characterized using optical absorption, resonance Raman and photoluminescence spectroscopies as well as scanning force microscopy. Taken together with literature observations, our findings suggest that near zigzag edge tubes of similar diameters in a bundle are harder to separate from each other than for other chiral index combinations. We discuss the implications of these observations for SWNT growth and dispersion.
authors.affiliation: Institut für Nanotechnologie, Karlsruhe Institute of Technology, D-76021 Karlsruhe, Germany.
authors.forename: Carolin
authors.initials: C
authors.lastname: Blum
authors.forename: Ninette
authors.initials: N
authors.lastname: Stürzl
authors.forename: Frank
authors.initials: F
authors.lastname: Hennrich
authors.forename: Sergei
authors.initials: S
authors.lastname: Lebedkin
authors.forename: Sebastian
authors.initials: S
authors.lastname: Heeg
authors.forename: Heiko
authors.initials: H
authors.lastname: Dumlich
authors.forename: Stephanie
authors.initials: S
authors.lastname: Reich
authors.forename: Manfred M
authors.initials: MM
authors.lastname: Kappes