title: Single-walled carbon nanotube purification, pelletization, and surfactant-assisted dispersion: a combined TEM and resonant micro-raman spectroscopy study.
abstract: Resonant Raman spectroscopy and transmission electron microscopy were used to characterize the structural changes of three single-walled carbon nanotube samples processed with purification, pelletization, and surfactant-assisted dispersion. A two-stage purification process selectively removes metallic tubes as well as small-diameter ones, enriching large-diameter semiconducting tubes. Pelletizing reduces the intertube distance but greatly increases the intensity ratio of the D band to the G band. Single-walled nanotube (SWNT) bundle size decreases during ultrasonication dispersion aided by a surfactant. SWNT bundles composed of large-diameter tubes are prone to debundling.
authors.affiliation: Department of Chemistry, New Mexico Tech, Socorro, New Mexico 87801, USA.
authors.forename: Kai
authors.initials: K
authors.lastname: Shen
authors.forename: Seamus
authors.initials: S
authors.lastname: Curran
authors.forename: Huifang
authors.initials: H
authors.lastname: Xu
authors.forename: Snezna
authors.initials: S
authors.lastname: Rogelj
authors.forename: Yingbing
authors.initials: Y
authors.lastname: Jiang
authors.forename: James
authors.initials: J
authors.lastname: Dewald
authors.forename: Tanja
authors.initials: T
authors.lastname: Pietrass
mesh_terms: D002244:Carbon / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D036103:Nanotechnology; D043942:Nanotubes / Q000737:chemistry*; D013059:Spectrum Analysis, Raman; D013501:Surface-Active Agents
chemical_list: D013501:Surface-Active Agents; D002244:Carbon