▎ 摘　　要

The growth of multi-walled carbon nanotube (MWCNT) and carbon nano structures is investigated in methane (CH4) environment at low pressure using arc discharge process for arc currents 50, 70 and 90A. Plasma density and temperature areestimated by optical emission spectroscopy to determine the contribution of arc current and ambient environmenttowards the growth of MWCNT and nano structures. The grown samples at different arc currents are analyzed by transmission electron microscopy, scanning electron microscopy, Raman spectroscopy, Fourier Transform Infrared spectroscopy, thermogravitic analysis and x-ray diffraction. An improvement in structure quality in term of defects and increase growth of MWCNT is observed in CH4 ambient environment with increasein arc current. For arc current 90A, the well aligned and straight MWCNT along with graphene are detected.