In the present work, cryo-dielectric barrier discharge (DBD) plasma was generated continuously below room temperature down to liquid nitrogen temperature (296 to 78 K) under atmospheric pressure using parallel indium-tin-oxide (ITO)-coated electrodes. Gas-temperaturedependent optical emission spectroscopy (OES) measurements and discharge pattern observation of cryo-DBD plasma were performed. In the case of helium gas, the discharge mode of cryo-DBD plasma changed from filamentary mode to glow mode as the gas temperature decreased. When introducing a small amount of nitrogen in helium gas, the filamentary discharge mode persisted upon decreasing the gas temperature, although the discharge pattern changed from concentric rings (296K) to a hexagon-like pattern (78K).
ASJC Scopus subject areas
- Physics and Astronomy(all)