Abstract
Both single-walled and multi-walled carbon nanotubes ( SWNTs and MWNTs) are produced using a solar reactor working under nitrogen atmosphere. Samples were studied by transmission electron microscopy ( TEM), Raman spectroscopy and electron energy loss spectroscopy ( EELS). The produced MWNTs exhibit the typical morphologies observed for nitrogen-doped MWNTs synthesized with other methods and EELS measurements point out the presence of substituted nitrogen within the tubes. The doping level is not uniform and the maximum value reaches 11 at.%.