Singlet delta oxygen production in a 2D micro-discharge array in air: Effect of gas residence time and discharge power

Gaurav Nayak, João Santos Sousa, Peter J. Bruggeman

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

The production of singlet delta oxygen (O2(a 1Δg)) is of growing interest for many applications. We report on the measurement of O2(a 1Δg) and ozone (O3) in a room temperature atmospheric pressure discharge in dry air. The plasma source is a 2D array of micro-discharges generated by an alternating current voltage at 20 kHz. The study focuses on the effect of gas flow through the discharge. The maximum investigated flow rate allows reducing the gas residence time in the discharge zone to half the discharge period. Results indicate that the residence time and discharge power have a major effect on the O2(a 1Δg) production. Different O2(a 1Δg) density dependencies on power are observed for different flow rates. Effects of collisional quenching on the as-produced and measured O2(a 1Δg) densities are discussed. The flow rate also allows for control of the O2(a 1Δg) to O3 density ratio in the effluent from 0.7 to conditions of pure O3.

Original languageEnglish (US)
Article number105205
JournalJournal of Physics D: Applied Physics
Volume50
Issue number10
DOIs
StatePublished - Feb 10 2017

Keywords

  • air chemistry
  • dielectric barrier discharge
  • micro-discharge
  • singlet delta oxygen

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