Vibrational and photoelectron investigation of amorphous fluorinated carbon films

sp/sp(2) amorphous carbon mixtures have been deposited by pulsed jet cooled supersonic carbon beams using graphite and polytetrafluoroethylene (PTFE) as target materials in a pulsed laser vaporization source. The investigated structure and composition reveal the formation of hydrogenated and fluorinated carbons, with the latter embedded in a PTFE-like matrix. There is a relevant structural difference between the two classes of samples in both the sp and sp(2) subsystems, but a similar behavior in the degradation kinetics performed by dry air exposure was observed by Raman spectroscopy. Kinetic results are discussed with relation to the separate degradation of double- and triple-bonded carbon sp chains in the films.