The effect of gas additives on reactive species and bacterial inactivation by a helium plasma jet

Han XU (徐晗); Chen CHEN (陈晨); Dingxin LIU (刘定新); Weitao WANG (王伟涛); Wenjie XIA (夏文杰); Zhijie LIU (刘志杰); Li GUO (郭莉); M G KONG (孔刚玉)

doi:10.1088/2058-6272/ab3938

Plasma Science and Technology > 2019 > 21(11): 115502. > DOI: 10.1088/2058-6272/ab3938

Han XU (徐晗), Chen CHEN (陈晨), Dingxin LIU (刘定新), Weitao WANG (王伟涛), Wenjie XIA (夏文杰), Zhijie LIU (刘志杰), Li GUO (郭莉), M G KONG (孔刚玉). The effect of gas additives on reactive species and bacterial inactivation by a helium plasma jet[J]. Plasma Science and Technology, 2019, 21(11): 115502. DOI: 10.1088/2058-6272/ab3938

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The effect of gas additives on reactive species and bacterial inactivation by a helium plasma jet

¹ State Key Laboratory of Electrical Insulation and Power Equipment, Center for Plasma Biomedicine, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China
² Frank Reidy Center for Bioelectrics, Old Dominion University, Virginia 23508, United States of America
³ Department of Electrical and Computer Engineering, Old Dominion University, Virginia 23529, United States of America

Funds: This work is supported by National Natural Science Foundation of China (Grant Nos. 51722705 and 51837008).

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Received Date: May 14, 2019
Revised Date: August 01, 2019
Accepted Date: August 04, 2019

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Abstract

Abstract

In this paper, the influences of gas doping (O₂, N₂, Air) on the concentrations of reactive species and bactericidal effects induced by a He plasma jet are studied. Firstly, results show that gas doping causes an increase in voltage and a decrease in current compared with the pure He discharge under the same discharge power, which might be attributed to the different chemical characteristics of O₂ and N₂ and verified by the changes in the gaseous reactive species shown in the optical emission spectroscopy (OES) and Fourier transform infrared (FTIR) spectroscopy. Secondly, the concentrations of aqueous reactive oxygen species (ROS) and reactive nitrogen species (RNS) are tightly related to the addition of O₂ and N₂ into the working gas. The concentrations of aqueous NO₂- and NO3- significantly increase while the concentrations of aqueous ROS decrease with the admixture of N₂. The addition of O₂ has little effect on the concentrations of NO₂- and NO₃- and pH values; however, the addition of O₂ increases the concentration of O₂- and deceases the concentrations of H₂O₂ and OH. Finally, the results of bactericidal experiments demonstrate that the inactivation efficiency of the four types of plasma jets is He+O₂>He+Air>He>He+N₂, which is in accordance with the changing trend of the concentration of aqueous O₂-. Simultaneously to the better understanding of the formation and removal mechanisms of reactive species in the plasma–liquid interaction, these results also prove the effectiveness of regulating the concentrations of aqueous reactive species and the bacteria inactivation effects by gas doping.
- cold plasma jet,
- reactive species,
- plasma-liquid interaction,
- bactericidal effects

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The effect of gas additives on reactive species and bacterial inactivation by a helium plasma jet