title: Oxidation, deformation, and destruction of carbon nanotubes in aqueous ceric sulfate.
abstract: A simple wet chemical method involving only ultrasonic processing in dilute ceric sulfate (CS) was used to functionalize carbon nanotubes (CNTs). Unexpectedly, single-walled and multiwalled carbon nanotubes (SWCNTs and MWCNTs) were cut, oxidized, and disintegrated by sonication in 0.1 N CS for 2-5 h. Transmission electron microscopy (TEM), atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction spectroscopy (XRD), Raman scattering, and photoacoustic Fourier transform infrared spectroscopy (FTIR) were used to probe wall damage during the chemical processing. Cyclic voltammetry and impedance spectroscopy were used to evaluate the conductivity of the CS-treated CNTs. This one-step process resulted in the destruction of SWCNTs to produce nonconducting amorphous carbon. MWCNTs were oxidized and converted to graphitic materials and amorphous carbon with retained conductivity.
authors.affiliation: Biotechnology Research Institute, National Research Council Canada (NRCC), Montreal, Quebec, Canada H4P 2R2. john.luong@cnrc-nrc.gc.ca
authors.forename: John H T
authors.initials: JH
authors.lastname: Luong
authors.forename: Sabahudin
authors.initials: S
authors.lastname: Hrapovic
authors.forename: Yali
authors.initials: Y
authors.lastname: Liu
authors.forename: De-Quan
authors.initials: DQ
authors.lastname: Yang
authors.forename: Edward
authors.initials: E
authors.lastname: Sacher
authors.forename: Dashan
authors.initials: D
authors.lastname: Wang
authors.forename: Christopher T
authors.initials: CT
authors.lastname: Kingston
authors.forename: Gary D
authors.initials: GD
authors.lastname: Enright
mesh_terms: D004553:Electric Conductivity; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000648:ultrastructure; D010084:Oxidation-Reduction; D010316:Particle Size; D013010:Sonication; D013464:Sulfuric Acids / Q000737:chemistry*; D014867:Water / Q000737:chemistry
chemical_list: D037742:Nanotubes, Carbon; D013464:Sulfuric Acids; D014867:Water; C042259:ceric sulfate