Effective Area of Relatively Short-lived Reactive Oxygen Species Generated by Atmospheric-pressure Helium Microplasma Jet

Here we investigated effective area of relatively short-lived reactive oxygen species (ROS), i.e., OH radicals and / or singlet oxygen (1O₂), generated by an atmospheric-pressure helium microplasma jet. Discoloration of methylene blue solution in a 3D printed micro-well was used for evaluation of the effect of short-lived ROS. It was confirmed that there are no discoloration with longer-lived ROS and RNS. Our experimental results show that short-lived ROS can be affected a large area about 16 mm in diameter.