Abstract
Free electrons, produced in radio-frequency (13.56 MHz) glow discharges of O2, N2, and Ar, are recruited to multi-walled carbon nanotubes (MWNTs) by a positive electric field. Electron bombardment degradation is restricted to the tips of the MWNTs. SEM images show that a surface deposited layer develops during degradation. Gas phase plasma reactions form polycyclic aromatic hydrocarbons and plasma polymers, which are re-deposited on the MWNTs as thin films. The plasma polymer is identified as a polypyrrole (PPy)-like plasma polymer, as shown by molecular optical absorption spectroscopy and GC–MS. FT-IR spectra confirm that the surface films are composed of the same plasma polymer. Inert gas plasmas produce higher-molecular weight plasma polymers, while O2 plasma treatments produce over-oxidized polypyrrolic-plasma polymer films.
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