Improved and Large Area Single-Walled Carbon Nanotube Forest Growth by Controlling the Gas Flow Direction

A gas shower system was introduced to improve the growth of single-walled carbon nanotube (SWNT) forests by controling the gas flow direction. Delivery of gases from the top of the forest enabled direct and precise supply of ethylene and water vapor to the Fe catalysts. As such, this approach solved...

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Bibliographic Details
Published in:ACS nano 2009-12, Vol.3 (12), p.4164-4170
Main Authors: Yasuda, Satoshi, Futaba, Don N, Yamada, Takeo, Satou, Junichi, Shibuya, Akiyoshi, Takai, Hirokazu, Arakawa, Kouhei, Yumura, Motoo, Hata, Kenji
Format: Article
Language:English
Subjects:
Crystallization - methods
Gases - chemistry
Macromolecular Substances - chemistry
Materials Testing
Microfluidics - methods
Molecular Conformation
Nanotechnology - methods
Nanotubes, Carbon - chemistry
Nanotubes, Carbon - ultrastructure
Particle Size
Surface Properties
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Summary:A gas shower system was introduced to improve the growth of single-walled carbon nanotube (SWNT) forests by controling the gas flow direction. Delivery of gases from the top of the forest enabled direct and precise supply of ethylene and water vapor to the Fe catalysts. As such, this approach solved one of the limiting factors of water-assisted chemical vapor deposition method (CVD), that is, delivery of the very small optimum water level to the catalysts. Consequently, this approach improved SWNT forests growth stability, uniformity, reproducibility, carbon efficiency (32%), and catalyst lifetime. With this improved growth, we could synthesize a 1 cm tall forest with 1 × 1 cm size. Also we employed this approach to grow an A4 size SWNT forest to highlight the scalability of water-assisted CVD.
ISSN:1936-0851
1936-086X
DOI:10.1021/nn9007302