Method for manufacturing copper nanoparticles and copper nanoparticles manufactured using the same

Abstract

The present invention relates to a method for manufacturing copper nanoparticles and copper nanoparticles thus manufactured, in particular, to a method for manufacturing copper nanoparticles, wherein the method includes producing mixture by mixing one or more copper salt selected from a group consisting of CuCl 2 , Cu(NO 3 ) 2 , CuSO 4 , (CH 3 COO) 2 Cu and Cu(acac) 2 (copper acetyloacetate) with fatty acid and dissociating; and reacting the mixture by heating and copper nanoparticle. According to the present invention, copper nanoparticles can be synthesized in a uniform size and a high concentration using general copper salt as a copper precursor material in non-aqueous system without designing precursor material. The present invention is not only environment-friendly, but also economical as highly expensive equipment is not demanded.

1 . A method for manufacturing copper nanoparticles, the method comprising:
 producing a mixture by dissociating one or more copper salt selected from a group consisting of CuCl 2 , Cu(NO 3 ) 2 , CuSO 4 , (CH 3 COO) 2 Cu and Cu(acac) 2  (copper acetyloacetate) into fatty acid; and   reacting the mixture by heating.   
     
     
         2 . The method of  claim 1 , wherein the fatty acid is selected from a group consisting of saturated fatty acids (C n H 2n O 2 ), oleic acids (C n H 2n-2 O 2 ), lynolic acid (C n H 2n-4 O 2 ), lynolene acids (C n H 2n-6 O 2 ) and high unsaturated acids (C n H 2n-3 O 2 , C n H 2n-10 O 2 , C n H 2n-12 O 2 ) (n is an integer of 10-18). 
     
     
         3 . The method of  claim 2 , wherein the fatty acid is one or more selected from a group consisting of dodecarnoic acid (C 11 H 23 COOH), oleic acid (C 17 H 33 COOH), hexadecanoic acid (C 15 H 33 COOH) and tetradecanoic acid (C 13 H 27 COOH). 
     
     
         4 . The method of  claim 1 , wherein the fatty acid is mixed in a mole ratio of 2 to 10 with respect to the copper salt. 
     
     
         5 . The method of  claim 1 , wherein a primary aliphatic amine having carbon numbers of 3 to 18 is further added to the mixture. 
     
     
         6 . The method of  claim 5 , wherein the primary aliphatic amine is oleylamine or butylamine. 
     
     
         7 . The method of  claim 5 , wherein the primary aliphatic amine is further added in a mole ratio of 1 to 10 with respect to copper salt. 
     
     
         8 . The method of  claim 1 , one or more nonpolar solvents selected from a group consisting of toluene, xylene, chloroform, dichloromethane, hexane, tetradecane and octadecene is further added to the mixture. 
     
     
         9 . The method of  claim 8 , the nonpolar solvent is added in 200 to 1000 parts by weight with respect to 100 parts by weight of the copper salt. 
     
     
         10 . The method of  claim 1 , the heating temperature is 50 to 300° C. 
     
     
         11 . The method of  claim 1 , the heating temperature is 150 to 300° C. 
     
     
         12 . The method of  claim 1 , further comprises: after reacting the mixture, adding at least one reducing agent selected from group consisting of NaBH 4 , LiBH 4 , KBH 4 , tetrabutylammonium borohydride, N 2 H 4 , PhHNNH 2 , NH 3 —BH 3 , (CH 3 ) 3 N—BH 3 , formate and NaHPO 2  into the mixture; and
 reacting the mixture by heating.   
     
     
         13 . The method of  claim 12 , prior to adding the reducing agent, the heating temperature of the mixture is 50 to 110° C. 
     
     
         14 . The method of  claim 12 , the reducing agent is added in a mole ratio of 1 to 6 with respect to the copper salt. 
     
     
         15 . The method of  claim 12 , the heating temperature is 50 to 150° C. 
     
     
         16 . The method of  claim 1 , the cooper nanoparticles has a size of 5 to 40 nm. 
     
     
         17 . Copper nanoparticles manufactured by a method of  claim 1 , wherein surface of the copper nanoparticles comprises fatty acid as a capping molecule. 
     
     
         18 . The copper nanoparticles according to  claim 17 , the fatty acid is 5 to 40 weight % with respect to whole weight.