Influence of hydrogen on the thermionic electron emission from nitrogen-incorporated polycrystalline diamond films
Raman spectroscopy of the as-grown nitrogen-incorporated diamond film. The large peak at 1332 cm−1 with a small peak around 1580 cm−1 indicates a predominately diamond sample with minimal graphitic content.
(Color online) Scanning electron micrograph of the nitrogen incorporated diamond film at 2.4 K × magnification demonstrating grain sizes on the order of ∼10 μm.
(Color online) Electron emission current data for the first two tests. Test #1 was an as-grown diamond sample and the thermionic emission current was observed to increase with temperature according to the Richardson equation until ∼800 °C upon which the emission current began to decrease. Test #2 was performed on the same sample after a cool down period. No emission current above the noise level was observed up to a maximum testing temperature of 800 °C. The solid line represents the fit to the Richardson equation of test #1 data.
(Color online) Electron emission current for the three tests: as-grown, post heating, and post hydrogenation. The electron emission current from the sample after hydrogenation is significantly higher than the previous runs. The solid line represents the fit of test #3 to the Richardson equation.
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