Patent ID: 9718132
Date: 2017-08-01
CPC Classifications: B22F,C23F

Claim:
1. A manufacturing method of spherical gold (Au) nanoparticles comprising: (a) manufacturing gold (Au) nanoparticles by heating a reaction solution containing a gold precursor, a cationic surfactant, an inorganic acid, and a reducing solvent; (b) primarily etching the gold (Au) nanoparticles by cooling the reaction solution to room temperature and additionally injecting the gold precursor into the reaction solution; (c) re-growing the gold (Au) nanoparticles to have a polyhedral shape by heating the reaction solution; and (d) secondarily etching the gold (Au) nanoparticles by cooling the reaction solution to room temperature and additionally injecting the gold precursor into the reaction solution.