Development and application of in-house high voltage power supply for atmospheric pressure plasma treatment system

Atmospheric pressure plasma is now being widely developed for simple surface treatment process and for fast medical tools sterilization. Plasma surface modification involves the interaction of the plasma generated excited species with a solid interface or coatings. The previous vacuum plasma system is not applicable and very costly. In the present project, we have developed the high voltage power supply and atmospheric pressure plasma using dielectric barrier discharge concept. The high voltage power supply was developed using a simple 555 timer and car´s ignition coil. Then, we investigate the plasma surface modification effect from the contact angle measurement and evaluate the roughness using surface profiler. We found that the contact angle decreased with the exposure time and surface roughness changed when exposed with atmospheric pressure plasma. It has been understood that a film coating will be create on glass and silicon surface when expose with atmospheric pressure plasma system in water vapor environment.