Synthesis of MWCNTs Using Monometallic and Bimetallic Combinations of Fe, Co and Ni Catalysts Supported on Nanometric SiC via TCVD

Nanometric  carbid  silicon  (sic)  supported  monometallic  and bimetallic  catalysts  containing  fe,  co,  ni  transition  metals  were prepared by wet  impregnation method. multiwall carbon nanotubes (mwcnts)  were  synthesized  over  the  prepared  catalysts  from catalytic decomposition of acetylene at 850°c by  thermal chemical vapor deposition (tcvd) technique. the synthesized nanomaterials (catalysts  and  cnts)  were  characterized  by  x-ray  diffraction (xrd),  scanning  electron  microscopy  (sem),  transmission electron microscopy (tem) and raman spectroscopy. in this paper, using  of  nanometric sic powder  as  catalyst  support was  examined and  the  effect  of  applied  catalyst  type  on  characteristics  of  grown cnts  was  investigated.  the  results  revealed  that  iron,  cobalt  and nickel  are  in  oxide,  cobalt  ferrite  (cofe2o4)  and  nickel  ferrite (nife2o4)  forms  and  nanometric  sic  powder  can  be  applied  as  an appropriate catalyst support in cnt growth process. it was observed that the produced cnts on bimetallic fe-co possess smaller average diameter,  less amorphous carbon and denser morphology compared to other binary metallic combinations. it was found that the catalytic activity of bimetallic composition decreased  in  the order of fe-co> fe-ni>  co-ni.  furthermore,  the  monometallic  fe  catalyst  has  the most  catalytic  activity  compared  to  monometallic  co  and  ni catalysts.