ON THE NATURE OF C-F BONDS IN VARIOUS FLUORINATED CARBON MATERIALS - XPS AND TEM INVESTIGATIONS

The different types of C-F interactions have been evidenced from XPS i nvestigations on fluorinated carbonaceous materials. The respective am ount of the C1 s and F1 s components depends on several factors, inclu ding the nature of the host material, the thermal treatments which inc rease the graphitization level and the fluorination conditions. TEM im ages and corresponding Fourier transforms of high temperature-treated pitch-based and PAN-based fibres have shown that only stage-1 compound s and graphitic-type domains are detectable in the experimental condit ions. In particular, no interlayer spacing corresponding to higher sta ge materials has been noticed. The observed results can be correlated to the ratio of semi-ionic to covalent F-C bonding determined by XPS.