Abstract
Atmospheric gas discharge is very likely to constrict into filaments and diffuse plasma formation is inefficient in most cases. Developing cost-efficient atmospheric diffuse plasma devices represents a significant challenge for high performance in biomedical decontamination and material processing. Here, we propose an alternative roadmap to produce a diffuse argon plasma jet by expanding and quenching the existing filamentary discharge at the initial or middle stage of streamer development. Possible mechanisms are summarized. With the gas flow velocity comparable to the ion drift one, enhancing ambipolar diffusion near the edge of the positive-streamer channel promotes the radial diffusion of newly-produced electrons, realizing the radial expansion of channel. Weakening electric field in front of the streamer head through head expansion and field offset, prevents the further development of streamer, leading to a positive-pseudo-streamer discharge. Reducing electric field in front of the negative-streamer head through ion compensation, impedes the initial growth of streamer, resulting in a negative pulseless glow discharge. The positive-pseudo-streamer and negative pulseless glow discharges function together to form the diffuse plasma jet.
Highlights
Atmospheric gas discharge is very likely to constrict into filaments and diffuse plasma formation is inefficient in most cases
It is clearly seen that the electric field between the electrodes is parallel with the tube axis and the discharge occurs in a linear field, in which the charged particles drift along or against the gas flow
We successfully fabricated an atmospheric diffuse argon plasma jet in a large gas gap cylindrical dielectric-barrier discharges (DBDs) equipped with a thin quartz tube
Summary
Atmospheric gas discharge is very likely to constrict into filaments and diffuse plasma formation is inefficient in most cases. Almost all the methods mentioned above are based on the wellknown streamer coupling model, where multiple streamers develop simultaneously and couple into a large discharge channel under a relatively low electric field[25,31] This model contributes much to understanding and producing diffuse discharges, the adverse behavior of likely-formed-filament DBDs at atmospheric pressure still largely restrains the popularization and application of plasma devices. A promising method is proposed to produce diffuse APPJs by a combination of pseudostreamer discharge and pulseless glow discharge in the positive and negative alternations of applied voltage, respectively This combination process is realized by technically controlling the gas flow in a large gap DBD, which is equipped with a thin quartz tube in a linear field. This work provides us another route to understand and explore the diffuse discharge formation
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