Room-temperature slot microplasma in atmospheric pressure air between cylindrical electrodes with a nanoporous alumina dielectric

Slot microplasma in low temperature, atmospheric pressure air is developed for applications in surface, gas, or biomedical treatments. Dielectric barrier discharge between two parallel aluminum (Al) rods covered with nanoporous alumina films, ∼ 60 μ m thick and mean pore diameters of ∼ 40 nm , is driven by 20 kHz ac power. The glow microplasma is stable and spatially uniform, using 2 - 10 W , in the gap of 100 - 500 μ m between the rods of 3 mm diameter and 5 cm long. This type of slot discharge operational in ambient temperature atmospheric pressure air can provide large-scale nonthermal plasma for any applications requiring continuous low temperature treatments.