SEM micrograph of surface of cathode which is printed and baked.
Field-emission measurement system: side view (A) and top view (B).
SEM micrograph of surface of cathode which is surface treaded at .
(Color online) Raman spectrum of cathode with and without surface treatment by high electric field.
(Color online) Typical field-emission characteristics (A) and FN plot (B) before UV light irradiation. The dashed straight line in (B) is a guide for the eyes to recognize linear relationship.
(Color online) Field-emission current normalized by averaged current before UV light irradiation with wavelengths of 365 nm (A) and 405 nm (B) as a function of time. The UV light irradiation is performed between 20 and 45 min.
(Color online) Long-term observation of the emission current. The UV light irradiation is performed between 20 and 45 min.
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