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Non-thermal atmospheric-pressure biocompatible plasma (NBP) has diverse functions such as surface treatment, and cleaning and decomposing organic matter. Few commercially available devices use plasma to sterilize and disinfect the air and surfaces. We commercialize a new plasma sterilizer that can eradicate viruses, bacteria, etc., using NBP with a compact setup. The hydroxyl (OH) radical species concentration inside the dielectric-barrier discharge (DBD) is estimated from the equation reduced by R. Sankaranarayanan, which is approximately 9.78 × 1015 cm−3. The new plasma sterilizer with water droplets developed in this work exhibits excellent sterilization properties, with the OH radical concentration being approximately 30 times higher than that obtained in other types of atmospheric-pressure DBD devices in air saturated with vapor.

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