Scalable Array of Microplasma Jets for Liquid-Phase Oxidation

Atmospheric-pressure microplasma jet devices have demonstrated its efficacy in liquid-phase oxidation. Their oxidative properties were investigated using oxidation-sensitive dyes and organic compounds dissolved in aqueous solutions, simulating plasma treatment scenarios with jets directed at the water surface. When brilliant blue dye solutions were treated with an argon microplasma jet, a significant decrease in the key chromophore absorbance at 629 nm was observed within 15 minutes, indicating oxidative dissociation of the dye's conjugated bonds. Chemical scavenger tests using isopropanol and ethanol confirmed that hydroxyl radicals are the primary oxidative species. To explore scalability, we developed and tested both an array of microplasma jet devices and two-dimensional planar jet systems, which provided uniform treatment over larger areas of a liquid phase targets. Collectively, these results highlight the potential of microplasma jets for applications in semiconductor processing, biomedicine, and agriculture.