Synthesis and Characterization of Carbon Nanotubes Catalyzed by Fe, Co and Fe-Co Nanoparticles Supported on Nanometric Al2O3 via TCVD

Monometallic and bimetallic Fe and Co catalytic nanoparticles supported on alpha phase ofnanometric Al2O3 substrate were prepared by wet impregnation method. These nanostructured catalyticbases were used to catalyze the growth of multiwalled carbon nanotubes (MWCNTs) from acetylenedecomposition at 700C by the thermal chemical vapor deposition (TCVD) technique. Thenanomaterials (catalyst and CNTs) were characterized by X-ray diffraction (XRD), Scanning electronmicroscopy (SEM) and Raman spectroscopy. The results showed that the alpha phase of nanometricAl2O3 powder can be applied as an appropriate catalyst support in CNT growth process. It was observed,at the mentioned growth temperature the Fe particles are not active and the bimetallic Fe-Co catalyst isvery more active than the Co monometallic one. However, the CNTs synthesized on Co monometalliccatalyst possess smaller avrege diameters, better quality and lower growth uniformity compared to Fe-Co bimetallic catalyst type.

کلیدواژه ها:

CNTs ، TCVD ، alpha Al2O3 ، Monometallic and bimetallic catalyst