fig2

Figure 2. Schematic diagrams of some plasmas. (A) Microwave discharge plasma^[20]; (B) Corona discharge^[23]; (C) Glow discharge plasma^[21]; (D) DBD plasma^[22]; (E) High-frequency discharge plasma^[24]; (F) Electric arc discharge^[25]; (G) Gliding arc plasma^[26]. DBD: Dielectric barrier discharge.