Patent ID: 8864871

Claim:
A method for manufacturing copper metal nanoparticles with 50-70 nm size for conductive ink for wiring pattern formation, using microwaves, the method comprising: preparing a mixture solution comprising a copper salt, a dispersing agent that is used in a mole ratio of 1 to 20 with respect to 1 mole of the copper salt, a reducing agent that is used in a mole ratio of 2 to 6 with respect to 1 mole of the copper salt, and an organic solvent, wherein the copper salt is at least one compound selected from the group consisting of CuCl 2 , Cu(NO 3 ) 2 , CuSO 4 , (CH 3 COO) 2 Cu, copper(II) acetylacetonate, copper (II) carbonate, copper (II) cyclohexane butyrate, copper (II) stearate, copper (II) perchlorate, copper (II) ethylenediamine and Cu(OH) 2 ; raising temperature of the mixture solution up to 30-50° C. and agitating; irradiating, after raising the temperature of the mixture solution up to 30-50° C. and agitating, the mixture solution with microwaves, wherein the strength of irradiating is 0.01 to 0.5 W/cm 3 and the time of irradiating is 2 to 10 minutes; and obtaining the copper metal nanoparticles by lowering a temperature of the mixture solution, the obtained copper metal nanoparticles having a particle size of 50-70 nm.