Surface characteristics of carbon fibers modified by direct oxyfluorination

The effect of oxyfluorinated conditions on the surface characteristics of carbon fibers was investigated. Infrared (IR) spectroscopy results indicated that the oxyfluorinated carbon fibers showed carboxyl/ester groups (CO) at 1632 cm−1 and hydroxyl groups (OH) at 3450 cm−1 and had a higher OH peak intensity than that of the fluorinated ones. X-ray photoelectron spectroscopy (XPS) results for the fibers also showed that oxyfluorination introduced a much higher oxygen concentration onto the fiber surfaces than fluorination with F2 only. Additionally, contact-angle results showed that the surface was better wetted by following oxyfluorination and that the polarity of the surface was increased by increasing the oxyfluorination temperature.

Graphical abstractXPS wide-scan spectra of oxyfluorinated carbon fiber specimens as a function of oxyfluorination condition.Figure optionsDownload full-size imageDownload as PowerPoint slide