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In this paper, graphite nanospine cathode (GNS) were fabricated by plasma etching using microwave plasma CVD. In order to evaluate emission characteristics, a triode-type field emission X-ray tube was fabricated which was composed of GNS cathode, control electrode, and an anode. The anode current-voltage characteristics of X-ray tube was shown with respect to GNS cathode and control electrodes. This...
In this paper, a self-focusing field electron emitter was proposed and simulated with finite element method. In the electron emitter proposed, the gate electrode is placed on center and surrounded by cathode. Therefore, gate electrode is not only to extract the electron from cathode, but also to focus the electron beam. The simulated results show a significant decrease of the dispersion of electron...
In this paper, we show the emission current fluctuation of graphite nanoneedle cold cathode (GRANN) as a function of cathode temperature in the presence of various gases such as H2, CO, and He molecules. Field emission current measurements were performed in an atmosphere of the above gas (10-5-10-8 torr) over a temperature range of 300 to 1800 K. A high sensitivity quadrupole mass spectrometer was...
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