High yield production of defect less carbon nanotubes in an arc process
  An efficient modified arc plasma method, where a focusing electric field is superimposed on the arc electric field, is optimized for the bulk generation of highly pure multi-walled carbon nanotubes. Raman spectroscopy and thermogravimetric measurements have been used to optimize the process. 
Soumen Karmakar, Naveen V. Kulkarni, V.G. Sathe, A.K. Shrivastava,   M.D. Shinde, S.V. Bhoraskar, and A.K. Das