title: Gas dwell time control for rapid and long lifetime growth of single-walled carbon nanotube forests.
abstract: The heat history (i.e., "dwell time") of the carbon source gas was demonstrated as a vital parameter for very rapid single-walled carbon nanotube (SWNT) forest growth with long lifetime. When the dwell time was raised to 7 s from the 4 s used for standard growth, the growth rate increased to 620 μm/min: a benchmark for SWNT forest growth on substrates. Importantly, the increase in growth rate was achieved without decreasing either the growth lifetime or the quality of the SWNTs. We interpret that the conversion rate of the carbon feedstock into CNTs was selectively increased (versus catalyst deactivation) by delivering a thermally decomposed carbon source with the optimum thermal history to the catalyst site.
authors.affiliation: Nanotube Research Center, National Institute of Advanced Industrial Science and Technolog y (AIST), 1-1-1 Higashi, Tsukuba 305-8565, Japan.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Yasuda
authors.forename: Don N
authors.initials: DN
authors.lastname: Futaba
authors.forename: Takeo
authors.initials: T
authors.lastname: Yamada
authors.forename: Motoo
authors.initials: M
authors.lastname: Yumura
authors.forename: Kenji
authors.initials: K
authors.lastname: Hata
mesh_terms: D001665:Binding Sites; D002244:Carbon / Q000737:chemistry; D002384:Catalysis; D002621:Chemistry / Q000379:methods; D005740:Gases; D006358:Hot Temperature; D036103:Nanotechnology / Q000379:methods*; D037742:Nanotubes, Carbon / Q000737:chemistry*; D013997:Time Factors
chemical_list: D005740:Gases; D037742:Nanotubes, Carbon; D002244:Carbon