Gold nanoparticles and method of synthesizing the same

Abstract

The present invention relates to gold nanoparticles which can be produced at low costs with high yields in large amounts by a liquid phase synthesis method and have a controlled size, as well as a synthesis method thereof. The inventive gold nanoparticles consist of gold nanoplates having a polygonal or circular plate structure.

1 . Gold nanoparticles which consist of gold nanoplates having a polygonal or circular plate structure.  
     
     
         2 . The gold nanoplates of  claim 1 , wherein the length of any one edge or diameter of the gold nanoplates is 10-2,000 nm.  
     
     
         3 . The gold nanoplates of  claim 1 , wherein the thickness of the nanoplates is 1-200 nm.  
     
     
         4 . A method for synthesizing gold nanoplates, which comprises the steps of: 
 stirring and heating an aqueous solution of HAuCl 4 .3H 2 O;    adding a dispersion stabilizer to the HAuCl 4 .3H 2 O solution;    adding a reducing agent to the HAuCl 4 .3H 2 O solution to which the dispersion stabilizer had been added; and    heating and cooling the resulting mixture so as to form gold nanoplates.    
     
     
         5 . The method of  claim 4 , which further comprises the step of inducing the precipitation of the aqueous solution having the gold nanoplates formed therein, and then treating the upper layer solution with a filter.  
     
     
         6 . The method of  claim 4 , wherein the concentration of the HAuCl 4 .3H 2 O solution is 0.1 mM to 10 mM.  
     
     
         7 . The method of  claim 4 , wherein the dispersion stabilizer is any one selected from the group consisting of citric acid, polyacrylic acid (PVA), polyethylene glycol (PEG) and polyvinylpyrrolidone (PVP).  
     
     
         8 . The method of  claim 7 , wherein the molar ratio between the gold ions of the HAuCl 4 .3H 2 O solution and the polyvinylpyrrolidone is 1:0.05 to 1:15.  
     
     
         9 . The method of  claim 8 , wherein the molar ratio between the gold ions of the HAuCl 4 .3H 2 O solution and the polyvinylpyrrolidone is 1:0.1 to 1:10.  
     
     
         10 . The method of  claim 4 , wherein the reducing agent is sodium citrate.  
     
     
         11 . The method of  claim 9 , wherein the molar ratio between the gold ions of the HAuCl 4 .3H 2 O solution and sodium citrate is 1:0.1 to 1:10.  
     
     
         12 . The method of  claim 9 , wherein the molar ratio between the gold ions of the HAuCl 4 .3H 2 O solution and sodium citrate is 1:0.1 to 1:1.