Selective production of reactive oxygen and nitrogen species in the plasma-treated water by using a nonthermal high-frequency plasma jet. (31st October 2017)

• Record Type: Journal Article
• Authors: Uchida, Giichiro; Takenaka, Kosuke; Takeda, Keigo; Ishikawa, Kenji; Hori, Masaru; Setsuhara, Yuichi
• Is Part Of: Japanese journal of applied physics. Volume 57:Number 1(2018)
• Publication Date: 2017-10-31
• Subjects: Physics -- Periodicals; 621.05
• DOI: 10.7567/JJAP.57.0102B4
• Languages: English
• ISSNs: 0021-4922

Abstract

Abstract: We present the control of H2 O2 and NO2 − productions in deionized water by using a high-frequency plasma jet driven by a 60 MHz voltage. In the gas phase, the high-frequency plasma jet has a high O ( 3 P) atom density of 8 × 10 14 cm −3, which is two orders of magnitude higher than that of the low-frequency plasma jet driven by a 5 kHz voltage. Concerning the production of reactive oxygen and nitrogen species in the liquid phase, with the direct contact of the plasma jet to the liquid surface, the H2 O2 concentration is higher than the NO2 − concentration. On the other hand, without the observable contact of the high-frequency plasm jet with high plasma density to the liquid surface, the NO2 − concentration increases with the flow rate of N2 (20%)O2 (80%) gas added to the Ar discharge gas and becomes more dominant compared with H2 O2 in the plasma-treated water. H2 O2 and NO2 − could be selectively produced in the plasma-treated water by using a nonthermal high-frequency plasma jet, which is a promising tool for biomedical applications.