Generation of NiTi nanoparticles via high voltage spark discharge in inert gas

Spark discharge method in inert gas, due to simplicity, no need for complex equipment and raw materials, ability to produce high-purity nanoparticles and mix metallic nanoparticles, is considered a susceptible method for the synthesis of nanoparticles with narrow size distribution. This method is capable to produce nanoparticles of electrical conductor materials and semiconductors. Also, with small changes in spark discharge system, this method can be capable to deposit thin layers of nanoparticles. Now, this method has been used for producing carbon, metal, alloy and metal oxide nanoparticles. Primary objective of this study was to construct a high voltage electrical discharge system. Next step was the synthesis of NiTi alloy nanoparticles in argon atmosphere, using the same Ni-50at%Ti alloy as electrodes. Characterization of NiTi nanoparticles by FESEM, EDX, DLS and HRTEM helps to determine the NiTi nanoparticles size distribution, morphology and composition. The results demonstrated primary nanoparticles ranging from 10 nm to 20 nm in size with a composition close to that of the electrodes.