Effect of material properties on electron density and electron energy in helium atmospheric pressure plasma jet

In recent years, Atmospheric pressure plasma jet (APPJ) have been widely used in biomedicine and material modification. APPJ exhibits different discharge characteristics when processing various materials or biological tissues, which has a certain influence on the processing effect. However, the influence of the processed material properties on the plasma characteristics has been ignored. This work developed a fluid model to study the influence of material properties (material thickness and relative permittivity) on the plasma characteristics of needle-plane APPJ, and the related influence mechanism was discussed. High electric field and electron energy appear in the head of streamer, which shows the plasma bullet has a substantial contribution to high-energy electrons in plasma jet. Both material thickness and relative permittivity increase the electric field strength, which leads to a corresponding increase in the electron energy and electron density of APPJ. Through further quantitative analysis, an interesting phenomenon was found that compared with the effect of material thickness, material relative permittivity has a more significant influence on the electron energy, while material thickness has a greater influence on the electron density. The reason is that material thickness has a greater effect on the ionization rate than the relative permittivity, resulting in greater degree of increase in electron density, while the increase in electron density has a certain contribution to the reduction of electron energy. The results depicts that processing effect will be further improved by taking into account the influence of material properties on the plasma characteristics of APPJ.

Abstract licence: CC BY-NC

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