The gas breakdown processes in dc microdischarges with a zeolite cathode (ZC) have been investigated. The electric field has a pronounce effect on the electrical characteristics of the ZC. The effects of electric field and secondary emission were discussed in atmospheric plasmas (AP). A nanoporous surface used as microreactor could enhance the electron emission from the cathode surface, thus reducing the breakdown voltage (UB). Results indicate that the UB decreases with increasing ZC diameter and decreasing with gap distance. Microdischarges in spatially confined geometries, such as the nanoporous structure of ZCs, present a promising method for the generation and maintenance of stable AP.
The stable dc air cold plasma is investigated experimentally functions of pressure p (8-760 Torr), electrode gaps d (50-250 µm), and diameters (9-22 mm) of the cathode areas in the gas discharge electronic devices (GDED) with nanoporous zeolite cathode (ZC). It is found that the current density and plasma emission (PE) intensity increase if the amplitude of the applied voltage reaches given threshold. Moreover, uniform PE inside the ZCs develops from the surface and can be generated in air up to atmospheric pressure (AP). The effect of various diameter of the ZC area on the gas breakdown is also considered. It is shown that breakdown voltage U B is reduced significantly for the larger diameters of the ZC area. Because of the very small d in our GDED, the behavior of charged particles in the electric field is described with the dc Townsend breakdown theory, depending upon the pressure range.
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