Abstract
X-ray absorption near-edge structure (XANES) spectroscopy has been used for comparative investigation of the electronic structure of pristine and fluorinated single-walled carbon nanotubes (SWCNTs) before and after annealing. The SWCNTs were produced by catalytic chemical vapor deposition method and fluorinated using a gaseous mixture of BrF3 and Br2 at room temperature. The samples were annealed at 250°C for 0.5 hour directly in the vacuum chamber of the X-ray spectrometer. C K-edge XANES spectra showed increase in the π* resonance intensity after the treatment of as-produced and fluorinated SWCNTs that was attributed to the detachment of adsorbed molecules and defunctionalization of nanotubes with the heating. Furthermore, analysis of the spectra revealed the annealing of the SWCNT samples produces topological defects in the nanotube walls.
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