Millimeter-Thick Single-Walled Carbon Nanotube Forests: Hidden Role of Catalyst Support

Details Millimeter-Thick Single-Walled Carbon Nanotube Forests: Hidden Role of Catalyst Support Millimeter-Thick Single-Walled Carbon Nanotube Forests: Hidden Role of Catalyst Support

2007-04-06

arxiv.org/abs/0704.0915v1

Physics

Condensed Matter

Materials Science

11 pages, 3 figures. Jpn. J. Appl. Phys. (Express Letters) in press

Scientific paper

10.1143/JJAP.46.L399

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.

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