title: Characterization of single-walled carbon nanotubes by scanning transmission X-ray spectromicroscopy: purification, order and dodecyl functionalization.
abstract: The C 1s X-ray absorption spectra of several isolated bundles of single-walled carbon nanotubes (SWCNT) have been measured using scanning transmission X-ray microscopy. First the C 1s and O 1s spectra of a purified but unfunctionalized SWCNT were measured. The C 1s --> pi* transition at 285 eV exhibited almost as strong a dichroic effect (spectral dependence on orientation) as that found in multiwalled carbon nanotubes (Najafi; et al. Small 2008, 7, 2279-2285). Second, purified SWCNT were functionalized with dodecyl and then investigated by STXM. Spectral evidence for the dodecyl functionalization is presented and discussed in comparison to the X-ray absorption spectra of aliphatic hydrocarbons. Both orientation and functionalization mapping of an individual SWCNT bundle is demonstrated.
authors.affiliation: Brockhouse Institute for Materials Research, McMaster University, Hamilton, Ontario L8S 4 M1, Canada.
authors.forename: Ebrahim
authors.initials: E
authors.lastname: Najafi
authors.forename: Jian
authors.initials: J
authors.lastname: Wang
authors.forename: Adam P
authors.initials: AP
authors.lastname: Hitchcock
authors.forename: Jingwen
authors.initials: J
authors.lastname: Guan
authors.forename: Stephane
authors.initials: S
authors.lastname: Dénommée
authors.forename: Benoit
authors.initials: B
authors.lastname: Simard
mesh_terms: D008855:Microscopy, Electron, Scanning / Q000379:methods*; D037742:Nanotubes, Carbon / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry; D013059:Spectrum Analysis, Raman; D056928:X-Ray Absorption Spectroscopy
chemical_list: D037742:Nanotubes, Carbon; D010100:Oxygen