Modeling of an atmospheric pressure plasma-liquid anodic interface: Solvated electrons and silver reduction

Yashuang Zheng, Lijun Wang, Peter Bruggeman

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Solvated electrons (eaq-) generated by atmospheric pressure plasmas in contact with liquids are a key source of plasma-induced liquid chemistry that enable applications in biotechnology and nanoparticle synthesis. In this paper, we report liquid phase reactive species concentrations near an anodic plasma-liquid interface as described by a fluid model. In particular, the interfacial structures and plasma-induced reactive species in NaCl and AgNO3 solutions as generated by a pulsed plasma are highlighted. The results show that the magnitude and the penetration depth of the eaq- concentration in AgNO3 solution are smaller than that in the NaCl solution due to the scavenger reactions of eaq- by Ag+ and NO3-. The early products of the plasma-induced Ag+ reduction are also presented, and the impact of the current density, the pulse width, and the AgNO3 concentration on the silver reduction is analyzed. It is further shown that a typical OH radical flux present in such plasmas can highly impact the eaq- concentration and the Ag+ reduction while the impact of vacuum ultraviolet radiation, H, and H2O2 is less pronounced.

Original languageEnglish (US)
Article number575
JournalJournal of Vacuum Science and Technology A: Vacuum, Surfaces and Films
Issue number6
StatePublished - Dec 1 2020

Bibliographical note

Funding Information:
P.B. was supported by the University of Minnesota and the Army Research Office under Grant No. W911NF-20-1-0105. Y.Z. acknowledges the support of the Chinese Scholarship Council that enabled her research Sintay at the University of Minnesota. Y.Z. and P.B. acknowledge the help of Santosh Kondeti in constructing the reaction set used in this work. The authors acknowledge the Minnesota Supercomputing Institute (MSI) at the University of Minnesota for providing resources that contributed to the results reported in this paper.

Publisher Copyright:
© 2020 Author(s).

Copyright 2020 Elsevier B.V., All rights reserved.

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