University of Kashan Journal of Nanostructures 2251-7871 3 3 2013 09 01 Synthesis and Characterization of Carbon Nanotubes Catalyzed by TiO2 Supported Ni, Co and Ni-Co Nanoparticles via CCVD 333 339 5474 10.7508/jns.2013.03.009 EN A. A. Hosseini Department of Physics, University of Mazandaran, Babolsar, Iran. F. Doustan Department of Physics, University of Mazandaran, Babolsar, Iran. M. Akbarzadeh Pasha Department of Physics, University of Mazandaran, Babolsar, Iran. Journal Article 2014 05 18 Monometallic and bimetallic Ni and Co catalytic nanoparticles supported on Titanium dioxide (rutile phase) substrate were prepared by wet impregnation method. These nanoparicles were used as catalysts for synthesis of multiwalled carbon nanotubes (MWCNTs) from acetylene decomposition at 700°C by the catalytic chemical vapor deposition (CCVD) technique. The nanomaterials (catalyst and CNTs) were characterized by X-ray diffraction (XRD), Scanning electron microscopy (SEM) and Raman spectroscopy. In this paper, the usage of TiO₂ powder as catalyst support was examined and the effect of applied catalyst type on characteristics of grown CNTs was investigated. The results showed that the rutile phase of TiO₂ powder can be applied as a suitable catalyst support in CNT growth process. Furthermore, it was observed that the CNTs synthesized on Ni-Co bimetallic catalyst possess smaller average diameters, better quality and less amorphous carbon compared to Ni and Co monometallic catalyst types. https://jns.kashanu.ac.ir/article_5474_9695596a4eecbaec1efbbdf15c15bce8.pdf