Method for Manufacturing Metal Nanoparticles Having a Core-Shell Structure with Good Oxidation Stability

Abstract

Provided is a method for manufacturing metal nanoparticles having a core-shell structure with good oxidation stability, wherein the method comprises the steps of: heating and agitating a core metal precursor solution; mixing a shell metal precursor solution with the heated and agitated core metal precursor solution, and heating and agitating the mixed metal precursor solution; and irradiating the heated and agitated metal precursor solution with radioactive rays. Thus, since yield can be maximized through a simple and environmentally friendly process that does not use a chemical reducing agent, there is no need for a process for removing an added reducing agent, and since a post-heat-treatment of particles is not performed, the manufacturing process is rendered simple and highly economical.

1 . A method of manufacturing metal nanoparticles having a core-shell structure with excellent oxidation stability, the method comprising:
 heating and agitating a core metal precursor solution;   mixing the heated and agitated core metal precursor solution with a shell metal precursor solution, and heating and agitating the mixed metal precursor solutions; and   irradiating the heated and agitated metal precursor solutions with radiation.   
     
     
         2 . The method of  claim 1 , wherein the core metal precursor solution is heated at 30° C. to 300° C. and agitated for 10 to 120 minutes. 
     
     
         3 . The method of  claim 1 , wherein the mixed metal precursor solutions are heated at 30° C. to 300° C. and agitated for 10 to 120 minutes. 
     
     
         4 . The method of  claim 1 , wherein the radiation includes one or more types of radiation selected from the group consisting of electron beam radiation, X-radiation and gamma radiation, and
 the radiation has an absorbed dose of 10 kGy to 500 kGy.   
     
     
         5 . The method of  claim 1 , wherein the core metal precursor solution includes one or more metal ions selected from the group consisting of gold, silver, copper, platinum, nickel, zinc, palladium, rhodium, ruthenium, iridium, osmium, tungsten, tantalum, titanium, aluminum, cobalt and iron. 
     
     
         6 . The method of  claim 1 , wherein the core metal precursor solution includes capping molecules. 
     
     
         7 . The method of  claim 6 , wherein the capping molecules include one or more compounds selected from the group consisting of a compound having a thiol group, a compound having a carboxyl group, and a compound having an amine group. 
     
     
         8 . The method of  claim 6 , wherein the capping molecules include one or more compounds having an amine group selected from the group consisting of propylamine, butylamine, octylamine, decylamine, dodecylamine, hexadecylamine, and oleylamine. 
     
     
         9 . The method of  claim 1 , wherein the shell metal precursor solution includes one or more metal ions selected from the group consisting of gold, silver, copper, platinum, nickel, zinc, palladium, rhodium, ruthenium, iridium, osmium, tungsten, tantalum, titanium, aluminum, cobalt and iron. 
     
     
         10 . The method of  claim 1 , wherein a metal included in the shell metal precursor solution has a lower degree of oxidation than that included in the core metal precursor solution.