In this paper, we demonstrate that, by adding a small amount of CF 4 (2%) into a compressed-air planar dielectric barrier discharge (DBD), one can effectively inactivate a B. subtilis spore up to 50mmin width in the postdischarge jet region after ten passes of exposure of plasma plume (equivalent plasma exposure time of 1 s) for treatment distance of up to 14 mm for the spore concentration in the range of 105?107 CFU/mL. A possible mechanism is proposed, i.e., the chemically active F atoms and CFn (n = 1? 3) are generated through the help of abundant excited nitrogen molecules in the postdischarge region.
- Air and B. subtilis spore
- atmospheric-pressure plasma (APP)
- dielectric barrier discharge (DBD)