Patent ID: 8317894

Claim:
A method of producing metal nanoparticles, the method comprising: (a) preparing a metal precursor solution by dissolving a metal precursor in an alcohol; (b) introducing the metal precursor solution into a reactor having supercritical fluid conditions, thereby producing metal nanoparticles; (c) cooling the solution obtained in step (b); and (d) separating and collecting the metal nanoparticles from the solution obtained in step (c), wherein the metal precursor is one or more selected from the group consisting of Cu(NO 3 ) 2 , CuSO 4 , CuCl 2 , Ni(NO 3 ) 2 , NiCl 2 , NiSO 4 , AgNO 3 , KAg(CN) 2 , AgCl, Ag 2 SO 4 , AgBF 4 , AgCN, Ru(NO 3 ) 3 , Ru 2 (SO 4 ) 3 , RuCl 3 , RhCl 3 , Rh(NO 3 ) 3 , H 3 RhCl 6 , RhPO 4 , Rh 2 (SO 4 ) 3 , Pd(NO 3 ) 2 , PdCl 2 , Pd(NH 3 ) 4 Cl 2 , Pd(NH 3 ) 2 Cl 2 , Pd(NO 2 ) 2 (NH 3 ) 2 , H 2 PdCl 6 , HAuCl 4 , AuCl 3 , NH 4 Au(CN) 2 and Na 3 Au(SO 3 ) 2 .