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Investigation of Nano-Structured White Carbon Films

White carbon films with sp1-hybridization of carbon were synthesized by microwave plasma chemical vapor deposition. The surface morphology of the deposited film, which consisted of nanograins and nanofibers, was observed by scanning electron microscope. The x-ray diffraction peak at 2θ=21.69o corresponds to the (110) facet of β modifications of white carbon material. The peak position at 283.2 eV in x-ray photoelectron spectrum represents binding energy of C1s core level of sp1-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/μm and the emission current density of 360μA/cm2 at electric field of 7V/μm were obtained.