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Enhancement of Microplasma Generated in Water by Adding Carbon Nanotubes

In this study, microplasma was generated in the distilled water, single-walled carbon nanotubes (SWCNTs) and graphite powder suspensions by using pulsed streamer discharge technique respectively. The phenomenon of microplasma in these suspensions was detected by using ICCD camera. Photograph of microplasma in the SWCNT suspension revealed that the microplasma was very stable and number of the discharge channel was dramatically increased, while the discharge in both of distilled water and graphite powder suspension were weak and unstable. It was experimentally concluded that the carbon shape and size have a direct effect on microplasma enhancement in water. Then the electric field at the tip of SWCNT was calculated by using simple plane to plane electrodes model. According to the theoretical results, the induced electric field was significantly enhanced when SWCNT exists on electrode. These results suggest that addition of carbon nanotubes in water could be useful for inception and activation of microplasma. In addition, enhancement of microplasma could represent an effective method for water purification processes such as sterilization and removal of organic pollutants and bacteria.