Patent ID: 8641976

Claim:
An apparatus for synthesizing nano particles, comprising: a plasma generator that generates plasma; a recovery device that recovers the synthesized nano particles; a cooler that is disposed between the plasma generator and the recovery device and includes a cooling path where the nano particles are synthesized, while material supplied from the plasma generator is cooled, the cooler including ring-shaped cooling plates stacked along the moving direction of the nano particles, the cooling plates having larger central opening diameters as going to the moving direction of the nano particles, and the cooler having injection holes, of which an injection angle is controlled so that cooling gas is injected to inner walls of the cooling path, provided between the cooling plates, a first cooling gas supply line that supplies first cooling gas to injection holes which are close to the plasma generator among the injection holes, and a second cooling gas supply line that supplies second cooling gas having a lower temperature than the first cooling gas to injection holes which are far from the plasma generator among the injection holes, the first cooling gas supply line and the second cooling gas supply line separated by at least one of the ring-shaped cooling plates; a deceleration gas supplier that is disposed on the opposite side of the plasma generator based on the cooler and injects gas to the cooling path in a direction opposite to the moving direction of the nano particles, wherein the plasma generator, the cooler, and the decelerating gas supplier are disposed on the same line in a row, and the recovery device is disposed at one side of the cooler, and the cooling path is set to have lower cooling temperatures for each section as going to the moving direction of the nano particles.