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Medientyp:
E-Artikel
Titel:
A low power flexible dielectric barrier discharge disinfects surfaces and improves the action of hydrogen peroxide
Beteiligte:
Gershman, Sophia;
Harreguy, Maria B.;
Yatom, Shurik;
Raitses, Yevgeny;
Efthimion, Phillip;
Haspel, Gal
Erschienen:
Springer Science and Business Media LLC, 2021
Erschienen in:Scientific Reports
Sprache:
Englisch
DOI:
10.1038/s41598-021-84086-z
ISSN:
2045-2322
Entstehung:
Anmerkungen:
Beschreibung:
<jats:title>Abstract</jats:title><jats:p>There is an urgent need for disinfection and sterilization devices accessible to the public that can be fulfilled by innovative strategies for using cold atmospheric pressure plasmas. Here, we demonstrate a successful novel combination of a flexible printed circuit design of a dielectric barrier discharge (flex-DBD) with an environmentally safe chemical reagent for surface decontamination from bacterial contaminants. Flex-DBD operates in ambient air, atmospheric pressure, and room temperature without any additional gas flow at a power density not exceeding 0.5 W/cm<jats:sup>2</jats:sup>. The flex-DBD activation of a 3% hydrogen peroxide solution results in the reduction in the bacterial load of a surface contaminant of > 6log<jats:sub>10</jats:sub> in 90 s, about 3log<jats:sub>10</jats:sub> and 2log<jats:sub>10</jats:sub> better than hydrogen peroxide alone or the flex-DBD alone, respectively, for the same treatment time. We propose that the synergy between plasma and hydrogen peroxide is based on the combined action of plasma-generated OH<jats:sup><jats:bold>·</jats:bold></jats:sup> radicals in the hydrogen peroxide solution and the reactive nitrogen species supplied by the plasma effluent. A scavenger method verified a significant increase in OH<jats:sup><jats:bold>·</jats:bold></jats:sup> concentration due to plasma treatment. Novel in-situ FTIR absorption spectra show the presence of O<jats:sub>3</jats:sub>, NO<jats:sub>2</jats:sub>, N<jats:sub>2</jats:sub>O, and other nitrogen species. Ozone dissolving in the H<jats:sub>2</jats:sub>O<jats:sub>2</jats:sub> solution can effectively generate OH<jats:sup><jats:bold>·</jats:bold></jats:sup> through a peroxone process. The addition of the reactive nitrogen species increases the disinfection efficiency of the hydroxyl radicals and other oxygen species. Hence, plasma activation of a low concentration hydrogen peroxide solution, using a hand-held flexible DBD device results in a dramatic improvement in disinfection.</jats:p>