Millimeter-thick single-walled carbon nanotube forests: Hidden role of catalyst support

Suguru Noda*, Kei Hasegawa, Hisashi Sugime, Kazunori Kakehi, Zhengyi Zhang, Shigeo Maruyama, Yukio Yamaguchi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

204 Citations (Scopus)


A parametric study of so-called "super growth" of single-walled carbon nanotubes (SWNTs) was done by using combinatorial libraries of iron/aluminum oxide catalysts. Millimeter-thick forests of nanotubes grew within 10 min, and those grown by using catalysts with a thin Fe layer (about 0.5 nm) were SWNTs. Although nanotube forests grew under a wide range of reaction conditions such as gas composition and temperature, the window for SWNT was narrow. Fe catalysts rapidly grew nanotubes only when supported on aluminum oxide. Aluminum oxide, which is a well-known catalyst in hydrocarbon reforming, plays an essential role in enhancing the nanotube growth rates.

Original languageEnglish
Pages (from-to)L399-L401
JournalJapanese Journal of Applied Physics, Part 2: Letters
Issue number17-19
Publication statusPublished - 2007 May 11
Externally publishedYes


  • Combinatorial method
  • Growth mechanism
  • Single-walled carbon nanotubes
  • Vertically aligned nanotubes

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)


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