A study on the formation mechanism of graphite fluorides by Raman spectroscopy

Raman spectra were measured of highly fluorinated graphite samples prepared at room temperature, 380 and 515 °C. CxF prepared at room temperature showed a novel downshifted band at 1555–1542 cm−1 along with G band at 1593–1583 cm−1. Similar behavior is also observed for samples prepared at 380 and 515 °C at early stages of fluorination, after which the Raman shifts completely disappeared. Raman spectra as well as X-ray diffraction (XRD) analysis suggest that graphite fluorides, (CF)n and (C2F)n are formed via fluorine-intercalated phase with planar graphene layers.