Investigation of Nano-Structured White Carbon Films

摘要

White carbon films with sp -hybridization of carbon were synthesized by microwave plasma chemical vapor deposition. The surface morphology of the deposited film, which consisted of nano-grains and nano-fibers, was observed by scanning electron microscope. The x-ray diffraction peak at 28=21.69° corresponds to the (110) facet of p modifications of white carbon material. The peak position at 283.2 eV in x-ray photoelectron spectrum represents binding energy of C_(1s) core level of sp~1-hybridization of carbon. Field electron emission properties of the film were tested by using a diode structure in a vacuum chamber. The turn-on field of 2.3V/ìm and the emission current density of 360ìA/cm~2 at electric field of 7V/ìm were obtained.