Abstract
The aim of this experiment is to enhance selected species in atmospheric pressure plasma jet (APPJ) that might be helpful for the wound healing purpose and to test the performance using basic diagnosis in plasma-treated liquid. A homemade APPJ device is driven by sinusoidal voltage with a excitation frequency of 25 kHz. Argon with admixture of small percentage of nitrogen, oxygen, and water vapor was selected to be carrier gas as the main sources of reactive species. Discharge power consumption is calculated by two approaches. Reactive oxygen species and reactive nitrogen species in the excited states are characterized by optical emission spectroscopy (OES). Excitation temperature $T_{\mathrm {exc}}$ in argon plasmas is calculated to estimate the electron energy distribution. The results show that argon plasmas with small addition of nitrogen and oxygen in this jet configuration are more efficient to generate desired reactive species in terms of OES diagnosis and liquid acidification. Moreover, the distinct efficiency of liquid acidification between direct and indirect plasma treatment of liquid has also been observed.
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