(a) Schematic diagram of the experimental setup. (b) Photograph of the atmospheric cold plasma brush with 4500 SCCM He (P = 24 W).
Typical oscillograms of applied voltage and discharge current of a filamentary discharge in He/O2
Survival curves of Enterococcus faecalis bacteria in the He with different O2 additions into atmospheric cold plasma brush (P = 24 W).
Scanning electron micrographs of Enterococcus faecalis bacteria of (a) untreated control, (b) helium plasma treatment, (c) He + 1% O2 plasma treatment, (d) He + 2.5% O2 plasma treatment. Plasma conditions were 4500 SCCM helium flow rate and 60 s exposure time (P = 24 W).
Emission spectra of the plasma with 4500 SCCM He/O2 (2.5%) taken at 5 mm bottom the nozzle (P = 24 W).
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