Electrochemical surface-hydrogenation and characterization of nitrogen-doped N-type nanocrystalline diamond film

The based on its unique structural feature,nitrogen-doped N-type nanocrystalline diamond thin film was successfully hydrogenated in surface via a mild electrochemical cathode polarization.Surface structure and micro-structure of nitrogen-doped N-type nanocrystalline diamond thin film before and after the treatment of electrochemical cathode polarization were carefully investigated by X-ray photoelectron spectrum(XPS),contact angle measurement,capacitance-voltage analysis,Raman spectrum and scanning electron microscopy(SEM).These results suggested that this electrochemical cathode polarization technique could not only obtain hydrogen-terminated surface,but also had not significant effect on micro-structure of diamond thin film,especially on sp2-hybridized carbon located in grain boundary,indicating that this technique is an effective and undamaged surface-hydrogenation method for nitrogen-doped N-type nanocrystalline diamond thin film.