Surface Modification of Carbon Fiber with Tetrafluoromethane Plasma

Abstract

Surface modification of carbon fiber by cold plasma of tetrafluoromethane was investigated.PAN-based and pitch-based carbon fibers were used.Plasma treatment was carried out by high-frequency discharge in tetrafluoromethane.The surface of carbon fiber was modified to be hydrophobic by treatment. The carbon fiber underwent heat-treatment or immersion in water, after which stability of the fluorine introduced was examined by measuring the contact angle with water, fluorine content, and estimating F/C in ESCA spectra.The results revealed the following three types of the fluorine introduced by plasma treatment: (1) covalent bond type, insoluble in water and stable to heat,(2) layer interstitial type, insoluble in water and unstable to heat, (3) adsorption type, spluble in water and unstable to heat.

Adsorption characteristics of trichloroethylene on plasma‐treated activated carbon

“…Ohte et al n reported that three types of fluorine groups are introduced by plasma treatment: 1) covalent bond type, insoluble in water and stable to heat, 2) layer interstitial type, insoluble in water and unstable to heat, and 3) adsorption type, soluble in water and unstable to heat. To provide a more hydrophobic surface, a carbon fiber was used as the tetrafluoromethane plasma treatment surface 11 . Thus, it is considered that the interaction between the adsorbates containing fluorine atoms in the molecule and the surface of the activated carbon is extremely large.…”

Heating effects in modifying carbon surfaces by various cold plasma.

“…They are caused due to fluorine atoms or 0 atoms introduced by plasma treatment and generated radical. [6]- [8] . The mechanism of elapsed change also has been analyzed [6]- [8].…”

“…[6]- [8] . The mechanism of elapsed change also has been analyzed [6]- [8]. However, it is the merit of the plasma surface modification that the material can be modify at low temperature.…”