Oxidation, deformation, and destruction of carbon nanotubes in aqueous ceric sulfate.
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.
Luong
John H T
JH
Biotechnology Research Institute, National Research Council Canada (NRCC), Montreal, Quebec, Canada H4P 2R2. john.luong@cnrc-nrc.gc.ca
Hrapovic
Sabahudin
S
Liu
Yali
Y
Yang
De-Quan
DQ
Sacher
Edward
E
Wang
Dashan
D
Kingston
Christopher T
CT
Enright
Gary D
GD
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
D037742:Nanotubes, Carbon; D013464:Sulfuric Acids; D014867:Water; C042259:ceric sulfate