The thermal stability of fluorine-intercalated carbon fibres has been
studied using differential thermal analysis and thermogravimetry. The
selected host fibres were polyacrylonitrile-based and pitch-based carb
on fibres, either as-received or heat-treated at 3000 degrees C. Fluor
ination performed at room temperature in the presence of hydrogen fluo
ride led to stage-1 compounds for the most graphitized samples. The th
ermal stability was found to depend on the host structure and on the a
mount of intercalated fluorine.