The effects of catalyst treatment on fast growth of millimeter-long multi-walled carbon nanotube arrays

Zhao Yao Zhan, Ya Ni Zhang, Geng Zhi Sun, Lian Xi Zheng, Kin Liao

Research output: Contribution to journalArticlepeer-review

40 Scopus citations

Abstract

An optimized strategy was developed for fast growth of millimeter-long CNT arrays using chemical vapor deposition (CVD). Growth temperature of 800 °C was firstly determined, and catalyst heat treatment conditions were then optimized to probe the full potential of growth rate. 1.5 mm long CNT arrays were obtained in 10 min under optimized growth and catalyst heat treatment conditions. The growth rate of CNT arrays strongly depends on the growth temperature and catalyst heat treatment. Insufficient reduction could not reduce iron oxide into metallic state or/and crack down catalyst film into particles, but excessive treatment may result in large particles due to Ostwald ripening process. This method would offer more freedoms in designing the fast growth of high-purity, long CNT arrays.

Original languageBritish English
Pages (from-to)7704-7708
Number of pages5
JournalApplied Surface Science
Volume257
Issue number17
DOIs
StatePublished - 15 Jun 2011

Keywords

  • Carbon nanotubes
  • Fast growth
  • Heat treatment
  • Millimeter-long

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