Journal
ADVANCED ELECTRONIC MATERIALS
Volume 7, Issue 11, Pages -Publisher
WILEY
DOI: 10.1002/aelm.202100369
Keywords
flexible plasma sheet; polyimide film; surface ionization wave
Funding
- National Natural Science Foundation of China [11775175]
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This study investigates the propagation characteristics of surface ionization waves on flexible substrates, showing that the waves start near high-voltage electrodes and converge at ground electrodes in a symmetrical petal pattern. Furthermore, bending the flexible sheet can change the charge density without affecting the propagation of surface ionization waves.
Surface discharges on flexible substrates are attracting attention for their unique capability to generate large-scale non-thermal plasma and potential adaptability to complex objects in many fields, like biomedical inactivation and material processing. Two fundamental issues are manufacture of stable flexible plasma sources and mechanism of multiple surface ionization waves (SIWs) propagation on curved gas-solid interfaces. A polyimide-based flexible plasma sheet is realized through printed circuit board with a non-exposed electrode structure for discharge and the propagation properties of SIWs along its surface are investigated by experiments and simulations. Results show that SIWs start near the high-voltage electrodes, and develop to the ground electrodes in a symmetrical petal pattern shaped by the potential gradient. The counter-propagating SIWs merge above the ground electrodes, as the electrons' distribution converts from filament channel to a diffuse spatial distribution. Furthermore, bending the flexible sheet can change the charge density above the surface of polyimide, thus affects the space electron number density and electron temperature, but does not influence the overall appearance of SIWs propagation. This work will not only help to understand the surface process of ionization waves, but also benefit further researches on the application of flexible-material-based plasma source.
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