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 degreesC. 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 degreesC 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. (C) 2002 Elsevier Science B.V. All rights reserved.