Effect of Electrode Type on Non-Thermal Plasma Production

The atmospheric pressure plasma jet (APPJ) is a promising technique because its robustness of applying in many fields, due to its advantages such as high efficiency, safety, no toxic residue, and low cost. Therefore, in this paper, a simple yet approach has been implemented to optimize the better electrode types in the system of the plasma jet. A low-cost homemade plasma jet system is being utilized for the experiment. The plasma jet system is worked by a home-made high voltage AC power supply device, this device provides high voltages (peak-to-peak values) from 0 to 20 kV with variable frequencies between 0 to 12 kHz. Three electrode types are used, Aluminum Al, Copper Cu, and Silver-Ag. The discharge voltage is fixed at 9 kV during the experiment and the frequency at 7 kHz. In addition, working gas is Argon with 4 standard liter per minute as a fixed flow rate to show the effect of electrode type on plasma production. Optical emission spectrometer is used to analyze the spectra of the argon plasma with three electrodes types of the system. This study shows that the produced atmospheric plasma jet with Al electrode is more efficient than of those with Cu, and Ag electrodes due to electron temperature and reactive species production.