Abstract
We have improved the emission characteristic of diamondlike carbon (DLC)-coated Mo substrates by using a reduction-oxidation (redox) process. The maximum emission current density of the DLC/Mo films increased substantially from 10 to 225 μA/cm2 with the turn-on field decreased from 12.4 to 6.4 V/μm due to redox treatment. Secondary-ion mass spectrometry spectra and x-ray diffraction patterns show that the structure of Mo films was insignificantly changed due to oxidation and reduction, whereas atomic force microscopy and transmission electron microscopy indicate that the roughness increased markedly. The electron emission characteristics of DLC films coated on redox Mo substrates are much better than those of the films coated on normal Mo film, which is ascribed to the increase in the field enhancement factor of the DC films.
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