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Abstract

Disclosed herein are a method and apparatus for preparing metal nanoparticles using alternating current (AC) electrolysis, in which the yield of metal nanoparticles obtained can be greatly improved by maintaining the concentrations of a reducing agent and a dispersing agent at constant levels in proportion to the intensity of an electric current during the production of the metal nanoparticles. The method for preparing metal nanoparticles comprises the steps of: dissolving an electrolyte and a dispersing agent in pure water in a reactor to prepare an electrolytic solution; placing first and second electrodes apart from each other in the electrolytic solution in the reactor, the electrodes being made of the same material as metal nanoparticles to be obtained; applying alternating current at the first and second electrodes to ionize the metal of the first and second electrodes in the electrolytic solution; and introducing into the electrolytic solution a reducing agent so as to maintain the reducing agent at a constant level according to the concentration of metal ions produced, thereby reducing the metal ions to obtain the metal nanoparticles.

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First Claim