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Wall fluxes of reactive oxygen species of an rf atmospheric-pressure plasma and their dependence on sheath dynamics

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posted on 01.12.2014, 14:56 authored by Ding-Xin Liu, Aijun Yang, Xiao-Hua Wang, Ming-Zhe Rong, Felipe IzaFelipe Iza, Michael G. Kong
A radio-frequency (rf) atmospheric-pressure discharge in He–O2 mixture is studied using a fluid model for its wall fluxes and their dependence on electron and chemical kinetics in the sheath region. It is shown that ground-state O, O+2 and O− are the dominant wall fluxes of neutral species, cations and anions, respectively. Detailed analysis of particle transport shows that wall fluxes are supplied from a boundary layer of 3–300μm immediately next to an electrode, a fraction of the thickness of the sheath region. The width of the boundary layer mirrors the effective excursion distance during lifetime of plasma species, and is a result of much reduced length scale of particle transport at elevated gas pressures. As a result, plasma species supplying their wall fluxes are produced locally within the boundary layer and the chemical composition of the overall wall flux depends critically on spatio-temporal characteristics of electron temperature and density within the sheath. Wall fluxes of cations and ions are found to consist of a train of nanosecond pulses, whereas wall fluxes of neutral species are largely time-invariant.

Funding

This work was supported by the State Key Laboratory of Electrical Insulation and Power Equipment (No EIPE11108), the Fundamental Research Funds for the Central Universities of China, and the English Department of Health.

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

JOURNAL OF PHYSICS D-APPLIED PHYSICS

Volume

45

Issue

30

Pages

? - ? (11)

Citation

LIU, D.-X. ... et al, 2012. Wall fluxes of reactive oxygen species of an rf atmospheric-pressure plasma and their dependence on sheath dynamics. Journal of Physics D- Applied Physics, 45 (30), 305205.

Publisher

© IOP Publishing Ltd

Version

AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2012

Notes

This article was published in the serial, Journal of Physics D: Applied Physics [© IOP Publishing Ltd]. The definitive version is available at: http://dx.doi.org/10.1088/0022-3727/45/30/305205

ISSN

0022-3727

Language

en