Method of producing metal nanoparticles and metal nanoparticles produced thereby

Abstract

The present invention relates to a method of producing metal nanoparticles and the metal nanoparticles produced thereby and in particular, to a method of producing metal nanoparticles comprising preparing a first solution including a dispersing stabilizer and a polar solvent; preparing a second solution including a metal precursor and a polar solvent; and adding the second solution into the first solution by dividing at least 2 times. According to the present invention, it is possible to produce metal nanoparticles of uniform size and isotropy with high efficiency using small amount of dispersion stabilizer through controlling reaction.

1 . A method of producing metal nanoparticles, comprising:
 preparing a first solution including a dispersing stabilizer and a polar solvent;   preparing a second solution including a metal precursor and a polar solvent; and   adding the second solution by dividing at least 2 times into the first solution.   
     
     
         2 . The method of  claim 1 , wherein the dispersing stabilizer is one or more compounds selected from the group consisting of polyvinylpyrrolidone (PVP), a polyacid and derivatives thereof. 
     
     
         3 . The method of  claim 2 , wherein the polyacid is one or more compounds selected from the group consisting of polyacrylic acid, polymaleic acid, polymethylmethacrylate, poly(acrylic acid-co-methacrylic acid), poly(maleic acid-co-acrylic acid) and poly(acrylamide-co-acrylic acid), and the derivative is one or more compounds selected from the group consisting of sodium salts, potassium salts and ammonium salts of the polyacid. 
     
     
         4 . The method of  claim 1 , wherein the metal precursor is a compound selected from the group consisting of AgNO 3 , AgBF 4 , AgPF 6 , Ag 2 O, CH 3 COOAg, AgCF 3 SO 3 , AgClO 4 , AgCl, Ag 2 SO 4 , CH 3 COCH═COCH 3 Ag, Cu(NO 3 ) 2 , CuCl 2 , CuSO 4 , C 5 H 7 CuO 2 , NiCl 2 , Ni(NO 3 ) 2 , NiSO 4  and HAuCl 4 . 
     
     
         5 . The method of  claim 1 , wherein the polar solvent used for preparing the first solution and the second solution is independently one or more solvent selected from the group consisting of water, an alcohol and a polyol. 
     
     
         6 . The method of  claim 5 , wherein the alcohol is one or more alcohols selected from the group consisting of methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, 2-butanol, isobutanol, hexanol and octanol. 
     
     
         7 . The method of  claim 5 , wherein the polyol is one or more polyols selected from the group consisting of glycerol, glycol, ethylene glycol, diethylene glycol, triethyleneglycol, butanediol, tetraethylene glycol, propylene glycol, polyethylene glycol, polypropylene glycol, 1,2-pentanediol and 1,2-hexadiol. 
     
     
         8 . The method of  claim 1 , wherein 200 to 10,000 parts by weight of the polar solvent of the first solution is mixed based to 100 parts by weight of the dispersing stabilizer. 
     
     
         9 . The method of  claim 1 , wherein 150 to 100,000 parts by weight of the polar solvent of the second solution is mixed based to 100 parts by weight of the metal precursor. 
     
     
         10 . The method of  claim 1 , wherein the first solution further includes one or more solid catalysts selected from the group consisting of Cu (II), Cu (I), Fe (III) and Fe (II). 
     
     
         11 . The method of  claim 10 , wherein 1 to 10 parts by weight of the solid catalyst is mixed based to 1.00 parts by weight of the metal precursor. 
     
     
         12 . The method of  claim 1 , wherein the second solution further includes one or more reducing agents selected from the group consisting of dimethylformamide (DMF), dimethyl sulfuroxide (DMSO), NaBH 4 , LiBH 4 , tetrabutylammonium borohydride, N 2 H 4  and the mixtures thereof. 
     
     
         13 . The method of  claim 12 , wherein 1 to 10 parts by weight of the reducing agent is mixed based to 100 parts by weight of the metal precursor. 
     
     
         14 . The method of  claim 1 , wherein an addition rate of the second solution ranges from 0.001 to 1 mole of the metal precursor to 1 mole of dispersing stabilizer per minute. 
     
     
         15 . The method of  claim 1 , wherein the addition step is performed at 120 to 190° C. 
     
     
         16 . The method of  claim 1 , wherein the method of producing metal nanoparticles, further comprise:
 washing the mixture with an organic solvent after the step of adding the second solution into the first solution; and   obtaining the metal nanoparticles through centrifuging the mixture.   
     
     
         17 . Metal nanoparticles, produced by a method comprising preparing a first solution including a dispersing stabilizer and a polar solvent; preparing a second solution including a metal precursor and a polar solvent; and adding the second solution into the first solution by dividing at least 2 times. 
     
     
         18 . The metal nanoparticles of  claim 17 , including 2 to 8 weight % dispersing stabilizers among the metal nanoparticles.