NANO PARTICLE, NANO PARTICLE PRODUCTION METHOD AND NANO PARTICLE PRODUCTION DEVICE

PROBLEM TO BE SOLVED: To provide: a nano particle production method which can produce a high-quality nano particle, and can stably control a particle diameter; the nano particle which is produced on the basis of the nano particle production method; and a nano particle production device based on the nano particle production method.SOLUTION: Counter electrode pairs (2, 3 or the like) are arranged in the liquid of a solvent reaction part 1 accommodated with a refrigerant which contains a metal-containing substance, the solvent in the vicinity of the electrodes is evaporated by applying a burst high-voltage high-frequency pulse V2 between the counter electrodes, the application of the high-voltage high-frequency pulse V2 is stopped after in-liquid plasma P is generated in an air bubble which is generated by the evaporation, the in-liquid plasma P is distinguished, and a liquid temperature of a generation region of the in-liquid plasma P is lowered. With a processing period of the application and the stop as one cycle, the application and the stop of the high-voltage high-frequency pulse V2 are repeatedly performed, and the nano particle which contains the metal-containing substance can be produced by using the in-liquid intermittent plasma which is intermittently generated.