S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Energy Systems Engineering (에너지시스템공학부) Nuclear Engineering (원자핵공학전공) Journal Papers (저널논문_원자핵공학과)
High Purity Synthesis of Carbon Nanotubes by Methane Decomposition Using an Arc-Jet Plasma
- Choi, Shin Il; Nam, Jun Seok; Lee, Chan Min; Choi, Sooseok; Kim, Jong In; Park, Jin Myung; Hong, Sang Hee
- Issue Date
- Current Applied Physics 6, 224-229
- Author's version
- High purity carbon nanotubes are synthesized by methane decomposition using an arc-jet plasma of high temperature (5000-20000 K). Since the arc-jet plasma process is continuous and easily scalable, it is a promising technique for the large-scale commercial production of carbon nanotubes. In this experimental work, the arc-jet plasma is generated by a dc non-transferred plasma torch, in which a mixture of argon and hydrogen is used as a plasma forming gas and nickel powder as a metal precursor. Morphology, crystallization degree and purity of the carbon nanotubes in the soot produced under various processing conditions are evaluated by using scanning electron microscopy, transmission electron microscopy, Raman spectroscopy and thermogravimetric analysis. From the results of these material analyses, we have found that multi-walled carbon nanotubes of high purity were produced in the optimal operating condition. In addition, the thermal plasma characteristics for the carbon nanotubes growth are discussed from numerical simulation result of the arc-jet plasma.