OICC Press International Nano Letters 2228-5326 8 1 (March 2018) 2018 02 14 Synthesis and characterization of long-CNTs by electrical arc discharge in deionized water and NaCl solution 10.1007/s40089-018-0227-5 EN Amir Hossein Sari Plasma Physics Research Center, Science and Research Branch, Islamic Azad University, Tehran, IR Arezoo Khazali Plasma Physics Research Center, Science and Research Branch, Islamic Azad University, Tehran, IR Sara Sadat Parhizgar Plasma Physics Research Center, Science and Research Branch, Islamic Azad University, Tehran, IR Journal Article 2018 02 14 Abstract In this study, electrical arc discharge method is used for the synthesis of multi wall carbon nanotubes (CNTs). The advantages of applied setup for producing CNTs are simplicity, low-cost procedures and avoiding the multistep purification. The experiments were optimized by submerging graphite electrodes inside deionized water and various concentrations of sodium chloride solution. The purpose of this research is to investigate the effect of liquid medium on growth, size and quality of the CNTs structures. The results show that CNTs of 150 Â µm length or larger with high purity and quality without using catalyst are produced on the cathode surface. Furthermore, the quantity of CNTs is influenced by NaCl concentration. Scanning electron microscopy, Raman spectroscopy and X-ray diffraction technique were used to characterize the results.