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Catalytic activity of the spinel ferrite nanocrystals on the growth of carbon nanotubes

Hosseini Akbarnejad, R ; Sharif University of Technology | 2013

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  1. Type of Document: Article
  2. DOI: 10.1007/s10948-012-1758-z
  3. Publisher: 2013
  4. Abstract:
  5. We prepared three ferrite nanocatalysts: (i) copper ferrite (CuFe 2O4) (ii) ferrite where cobalt was substituted by nickel (Nix Co1-x Fe2O4, with x=0, 0.2, 0.4, 0.6), and (iii) ferrite where nickel was substituted by zinc (Zn y Ni1-y Fe2O4 with y=1, 0.7, 0.5, 0.3), by the sol-gel method. The X-ray diffraction patterns show that the ferrite samples have been crystallized in the cubic spinel structural phase. We obtained the size of grains by field emission scanning electron microscopy images and their magnetic properties by vibrating sample magnetometer. Next, carbon nanotubes were grown on these nanocatalysts by the catalytic chemical vapor deposition method. We show that the catalytic activity of these nanocrystals on the carbon nanotube growth depend on cation distributions in the octahedral and tetrahedral sites, structural isotropy, and catalytic activity due to cations. Our study may have applications in finding a suitable candidate of doped ferrite nanocrystals as catalysts for carbon nanotube growth. More interestingly, the yield of fabrication of carbon nanotubes can be considered as an indirect tool to study catalytic activity of ferrites
  6. Keywords:
  7. Carbon nanotubes 61.48.De ; Catalysis 81.16.Hc ; Chemical vapor deposition 81.15.Gh ; Crystal structure 61.05.c- ; Ferrites 75.50.Gg ; Sol-gel processing 81.20.Fw ; 81.15.Gh ; 81.20.FW ; Carbon nanotube growth ; Catalytic chemical vapor deposition ; Cation distributions ; Ferrite nanocrystals ; Field emission scanning electron microscopy ; Vibrating sample magnetometer ; Carbon nanotubes ; Catalyst activity ; Chemical vapor deposition ; Ferrites ; Field emission microscopes ; Magnetic materials ; Nanocrystals ; Nickel ; Sol-gel process ; Vapors ; X ray diffraction ; Zinc ; Ferrite
  8. Source: Journal of Superconductivity and Novel Magnetism ; Volume 26, Issue 2 , 2013 , Pages 429-435 ; 15571939 (ISSN)
  9. URL: http://link.springer.com/article/10.1007%2Fs10948-012-1758-z