Cold Atmospheric Pressure Plasma Jet Operated in Ar and He: From Basic Plasma Properties to Vacuum Ultraviolet, Electric Field and Safety Thresholds Measurements in Plasma Medicine

Applied Sciences

Andrei Vasile Nastuta¹  Torsten Gerling² 

[1] Physics and Biophysics Education Research Laboratory (P&B-EduResLab), Biomedical Science Department, Faculty of Medical Bioengineering, ‘Grigore T. Popa’ University of Medicine and Pharmacy Iasi, Str. M. Kogalniceanu No. 9-13, 700454 Iasi, Romania;ZIK plasmatis, Leibniz Institute for Plasma Science and Technology (INP), Felix-Hausdorff-Str. 2, 17489 Greifswald, Germany;

关键词: CAP;    electric diagnosis;    E-field measurements;    vacuum-ultraviolet spectroscopy;    patient leakage current;    power measurement;   

DOI  :  10.3390/app12020644

来源: DOAJ

【 摘 要 】

Application desired functionality as well as operation expenses of cold atmospheric pressure plasma (CAP) devices scale with properties like gas selection. The present contribution provides a comparative investigation for a CAP system operated in argon or helium at different operation voltages and distance to the surface. Comparison of power dissipation, electrical field strength and optical emission spectroscopy from vacuum ultraviolet over visible up to near infrared ((V)UV-VIS-NIR) spectral range is carried out. This study is extended to safety relevant investigation of patient leakage current, induced surface temperature and species density for ozone (O${}_3$) and nitrogen oxides (NO${}_x$). It is found that in identical operation conditions (applied voltage, distance to surface and gas flow rate) the dissipated plasma power is about equal (up to 10 W), but the electrical field strength differs, having peak values of 320 kV/m for Ar and up to 300 kV/m for He. However, only for Ar CAP could we measure O${}_3$ up to 2 ppm and NO${}_x$ up to 7 ppm. The surface temperature and leakage values of both systems showed different slopes, with the biggest surprise being a constant leakage current over distance for argon. These findings may open a new direction in the plasma source development for Plasma Medicine.

【 授权许可】

Unknown