Patent ID: 8460427

Claim:
A method for manufacturing metal nano particles having a hollow structure, comprising: providing 50 mL of a silver nitrate solution, wherein a concentration of a silver nitrate in the silver nitrate solution is 0.4 mM-4 mM; adding 2 mL of a reducing agent into the silver nitrate solution to precipitate silver nano particles at 40° C-70° for 10 mM to 45 min, wherein a concentration of a sodium borohydride in the reducing agent is 1 wt%, and; adding 50 mL of a hexachloroplatinic acid solution into the silver nitrate solution having the silver nano particles at 40° C-70° , wherein a concentration of a hexachloroplatinic acid in the hexachloroplatinic acid solution to be 0.4 mM-10 mM; and oxidizing the silver nano particles by platinum-ions from outside to inside to form platinum-nano particles having a hollow structure at 40° C-70° for 30 min to 60 min, wherein the platinum nano particles have an average outside diameter of 4.6±0.9 nm.