Journal
PLASMA SOURCES SCIENCE & TECHNOLOGY
Volume 26, Issue 6, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6595/aa7082
Keywords
nanosecond pulse; atmospheric pressure plasma; plasma effluent; ozone; reactive species
Categories
Funding
- JSPS KAKENHI [15K17480, 24108004]
- Foundation for The Promotion of Ion Engineering
- Grants-in-Aid for Scientific Research [17H04817, 24108004, 15K17480, 16K13708] Funding Source: KAKEN
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The effects of nanosecond pulse superposition to alternating current voltage (NS + AC) on the generation of an air dielectric barrier discharge (DBD) plasma and reactive species are experimentally studied, along with measurements of ozone (O-3) and dinitrogen monoxide (N2O) in the exhausted gas through the air DBD plasma (air plasma effluent). The charge-voltage cycle measurement indicates that the role of nanosecond pulse superposition is to induce electrical charge transport and excess charge accumulation on the dielectric surface following the nanosecond pulses. The densities of O-3 and N2O in NS + AC DBD are found to be significantly increased in the plasma effluent, compared to the sum of those densities generated in NS DBD and AC DBD operated individually. The production of O-3 and N2O is modulated significantly by the phase in which the nanosecond pulse is superimposed. The density increase and modulation effects by the nanosecond pulse are found to correspond with the electrical charge transport and the excess electrical charge accumulation induced by the nanosecond pulse. It is suggested that the electrical charge transport by the nanosecond pulse might result in the enhancement of the nanosecond pulse current, which may lead to more efficient molecular dissociation, and the excess electrical charge accumulation induced by the nanosecond pulse increases the discharge coupling power which would enhance molecular dissociation.
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