The Production Efficiency of Reactive Oxygen and Nitrogen Species (RONS) of AC and Pulse-DC Plasma Jet
Jiayin Li, Fan Wu, Lanlan Nie, Xinpei Lu, Kostya Ostrikov
Abstract
Atmospheric pressure plasma jets driven by ac and pulsed-dc voltage were characterized, operating in helium with different admixture fractions up to 2% pure air, N <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> , and O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> . The absolute production efficiency of nitrogen dioxide, nitric oxide, ozone, hydroxyl, and atomic oxygen was measured when plasma was processing real biological tissue. The power consumption of each power source, the effect of frequency, and gas composition were investigated. It has been found that the power consumption of 10-kHz ac-driven plasma jets increases with gas mixture increasing from 0% to 0.5% and then decreases slightly with gas mixture increasing from 0.5% to 2.0%, while 1-kHz ac-driven plasma jets are almost constant. Moreover, the average dissipated power of 10-kHz ac-driven plasma jets was about ten times more than that of the 1-kHz case, while the power consumption of P-dc-driven plasma jets was not drastically affected by gas admixture. Furthermore, O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> and air were important impurities contributing to the O, O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> , and NO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> production efficiency, while N <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> admixture would enable the diminution of O and O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> production efficiency. Especially, an admixture of O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> , N <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> , and air to the main helium flow led to a reduction of OH and NO production efficiency for both ac and pulsed-dc power supply. This research may prove to be valuable both for an attainable range of RONS production efficiency and plasma medical research as a tool for assigning specific RONS or RONS mixtures.