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Formation of carbon nanotubes in Iron-catalyzed arcing method: Effect of iron-ion charge in the aqueous medium [electronic resource]

Shervin, Sh ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1142/S0217979211102265
  3. Abstract:
  4. Carbon nanotubes (CNTs) were synthesized via arc discharge in aqueous solutions containing ferrous and ferric irons to reveal the effect of iron-charge mole ratio, R = [Fe2+]/[Fe3+], on the purity of CNTs and the process yield. Raman spectroscopy and transmission electron microscopy were used to analyze the cathodic deposits. It is shown that the nucleation of multi-walled CNTs is catalyzed by ferric irons while their growth is affected by ferrous ions. Well-graphitized CNTs with a high-yield are obtained at R = 1 and total iron concentration of 0.05 M. The effect of iron charge is described based on the two-stage formation mechanism
  5. Keywords:
  6. Carbon nanotubes ; Nanomaterials ; Arc discharge ; Iron charge ; Raman spectroscopy
  7. Source: International Journal of Modern Physics B Condensed Matter Physics; Statistical Physics; Atomic, Molecular and Optical Physics ; 30 December 2011, Volume 25, Issue 32, PP. 4411-4417
  8. URL: http://www.worldscientific.com/doi/abs/10.1142/S0217979211102265