The method for producing metal nanoparticles according to an embodiment of the present invention includes generating microplasma between the plasma generating unit and the electrolyte in a reaction tank including an oxidizing electrode, a plasma generating unit, and an electrolyte, including metal ions in the electrolyte. And injecting the metal precursor solution at a constant injection rate, and forming metal nanoparticles by reducing the metal ions and electrons supplied from the microplasma.
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