Direct current discharge plasma chemical vapor deposition of nanocrystalline graphite films on carbon fibers

Nanocrystalline graphite films were synthesized on carbon fibers by the direct current discharge plasma chemical vapor deposition method. The morphology and microstructure of the obtained products were characterized by scanning electron microscopy, Raman spectroscopy, and transmission and high-resolution transmission electron microscopy. The results showed that the size and thickness of graphite nanosheets were about 0.3-2,um and 5-20 nm, respectively, and the purity and graphitization degree of the films can be improved by increasing the deposition time of graphite nanosheets. The down-shift of the G peak in Raman spectra can be attributed to the temperature differences of samples heating by laser radiation. In comparison with the products grown on silicon substrate under similar experimental parameters, carbon fiber substrate is more favorable for the deposition of graphite structure.