Reactive Oxygen Species Controllable Nonthermal Atmospheric Pressure Plasmas Using Coaxial Geometry for Biomedical Applications

We used a coaxial geometry to create novel nonthermal and high oxygen-rich helium plasmas to enhance the reactive oxygen species concentrations under low-voltage driving conditions. The optical emission spectra of the plasma showed that the oxygen flow affected the plasma properties, without generating oxygen plasmas. Spectra intensities of oxygen peaks of 777 and 845 nm created from helium plasmas under oxygen-rich conditions were approximately two times greater than plasmas not under oxygen rich conditions. Results indicate the efficacy of oxygen-rich helium plasma jets in biomedical applications.