Synthesis of multi-walled C nanotubes by Fe-Ni (70 wt.%) catalyzed chemical vapor deposition from pre-heated CH4

Altay M., Eroglu S.

MATERIALS LETTERS, vol.67, no.1, pp.124-127, 2012 (SCI-Expanded, Scopus) identifier identifier

  • Publication Type: Article / Article
  • Volume: 67 Issue: 1
  • Publication Date: 2012
  • Doi Number: 10.1016/j.matlet.2011.09.011
  • Journal Name: MATERIALS LETTERS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.124-127
  • Keywords: Carbon nanotubes, Chemical vapor deposition, Pre-heating, Methane, CARBON NANOTUBES, NICKEL, GROWTH
  • Istanbul University-Cerrahpasa Affiliated: No

Abstract

This study aims to investigate effect of pre-heating of pure CH4 on the growth of C nanotubes by chemical vapor deposition in the presence of Fe-Ni (70 wt.%) alloy catalyst. It was observed that un-preheated CH4 yielded no C formation at 1050-1150 K owing to its poor decomposition rate, contrary to the results of thermodynamic analysis. Whereas, pre-heating treatment of CH4 at 1200 K prior to the growth increased pyrolysis of the hydrocarbon which promoted synthesis of C nanotubes at 1050-1150 K, possibly due to enhanced formations of intermediate gaseous species. TEM study revealed that the morphologies of the products consist of multi-walled C nanotubes. (C) 2011 Elsevier B.V. All rights reserved.