Abstract
Diamond spherical shell films with different methane concentrations were deposited by DC plasma jet CVD method. The morphology, impurities, internal fiber texture and surface roughness of diamond film were investigated by scanning electron microscopy, Raman spectroscopy, X-ray diffraction and roughness profile meter respectively. The results show that, at the beginning of diamond nucleation, diamond crystallites orientation was random, and influence of CH 4 concentration was negligible. At a low CH 4 concentration (1%) and the substrate temperature of 850 °C, high quality diamond film was prepared. The film structure was polycrystalline and (111) face was dominant. When CH 4 concentration was increased, diamond film has more local clusters, amorphous graphite. Thus, higher CH 4 concentration has negative influence on preparing high quality diamond film.
Published Version
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