Growth window and possible mechanism of millimeter-thick single-walled carbon nanotube forests

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

研究成果: Article

32 引用 (Scopus)


Our group recently reproduced the water-assisted growth method, so-called "SuperGrowth," of millimeter-thick single-walled carbon nanotube (SWNT) forests by using C 2H 4/H 2/H 2O/Ar reactant gas and Fe/Al 2O 3 catalyst. In this current work, a parametric study was carried out on both reaction and catalyst conditions. Results revealed that a thin Fe catalyst layer (about 0.5 nm) yielded rapid growth of SWNTs only when supported on Al 2O 3, and that Al 2O 3 support enhanced the activity of Fe, Co, and Ni catalysts. The growth window for the rapid SWNT growth was narrow, however. Optimum amount of added H 2O increased the SWNT growth rate but further addition of H 2O degraded both the SWNT growth rate and quality. Addition of H 2 was also essential for rapid SWNT growth, but again, further addition decreased both the SWNT growth rate and quality. Because Al 2O 3 catalyzes hydrocarbon reforming, Al 2O 3 support possibly enhances the SWNT growth rate by supplying the carbon source to the catalyst nanoparticles. The origin of the narrow window for rapid SWNT growth is also discussed.

ジャーナルJournal of Nanoscience and Nanotechnology
出版物ステータスPublished - 2008 11


ASJC Scopus subject areas

  • Condensed Matter Physics
  • Chemistry(all)
  • Materials Science(all)
  • Bioengineering
  • Biomedical Engineering