Highly effective large-area inactivation of B. subtilis spore using a planar dielectric barrier discharge jet with CF4/air mixture

Yi Wei Yang*, Jane Yii Wu, Ming Hung Chiang, Jong-Shinn Wu

*Corresponding author for this work

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

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.

Original languageEnglish
Article number6303932
Pages (from-to)3003-3006
Number of pages4
JournalIEEE Transactions on Plasma Science
Volume40
Issue number11 PART2
DOIs
StatePublished - 21 Sep 2012

Keywords

  • Air and B. subtilis spore
  • atmospheric-pressure plasma (APP)
  • CF
  • dielectric barrier discharge (DBD)
  • inactivation
  • sterilization

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