Core-shell structure metal nanoparticles and its manufacturing method thereof

Abstract

Metal nanoparticles, containing a copper core and thin layer of precious metals enclosing the core to prevent oxidization of copper, in which manufacturing the metal nanoparticles is economical efficiency because of increased copper content and since such metal nanoparticles contain a metal having high electrical conductivity such as silver for a thin layer, they can form a wiring having better conductivity than copper and there is little concern that silver migration may occur.

1 . Metal nanoparticles comprising:
 a copper core; and   a metal thin layer which encloses the copper core and has higher reduction potential than copper.   
     
     
         2 . The metal nanoparticles of  claim 1 , wherein the metal having higher reduction potential than copper is one or more metals selected from the group consisting of silver, palladium, platinum, gold and mixtures thereof. 
     
     
         3 . The metal nanoparticles of  claim 1 , wherein the metal nanoparticles has 50-100 nm in diameter. 
     
     
         4 . The metal nanoparticles of  claim 1 , wherein the metal thin layer has a thickness of 1-50 nm. 
     
     
         5 . The metal nanoparticles of  claim 1 , wherein the metal thin layer prevents copper from oxidation. 
     
     
         6 . Core-shell structure nanoparticles produced by a method including:
 forming copper nanoparticles from a copper precursor by using a reducing agent under a solvent including a primary amine; and   forming a metal thin layer having high reduction potential on the surface of the copper nanoparticles, with a metal precursor which has higher reduction potential than copper.   
     
     
         7 . The core-shell structure nanoparticles of  claim 6 , in which the core is copper and the shell is a layer composed of one or more metals selected from the group consisting of silver, palladium, platinum, gold and alloys thereof. 
     
     
         8 . A colloid including the core-shell structure nanoparticles of  claim 6 . 
     
     
         9 . A conductive ink including the core-shell structure nanoparticles of  claim 6 .