Revolution in Carbon Nanotube Synthesis-“Super Growth”

Futaba, Don N.; Hata, Kenji; Mizuno, Kohei; Yamada, Takeo; Namai, Tatsunori; Hayamizu, Yuhei; Yumura, Motoo; Iijima, Sumio

doi:10.7567/ssdm.2005.g-7-1

Cited by 1 publication

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“…Water-assisted growth was successfully carried out on various catalysts that provide SWNTs (Fe nanoparticles [2] by FeCl 3 , sputtered metal thin films (Fe, Al/Fe, Al 2 O 3 /Fe, Al 2 O 3 /Co)) on Si wafers, quartz, and metal foils, demonstrating the high generality of our approach. SWNTs were synthesized using Ar or He with H 2 as a carrier gas (total flow 1 m 3 STP per minute) at 1 atm with controlled amount of water vapor (concentration 100 ppm to 500 ppm).…”

Section: Methodsmentioning

confidence: 90%

“…The catalyst activity, mass density and tube density of SWNT forests were estimated by a statistical and macroscopic analytical approach [2]. For a typical SWNT forest, the SWNT area density is 5.2 x10 11 tubes/cm 2 , the mass density of the forest is 0.037 g/cm 3 , the average SWNT size is 3.0 nm, and the SWNT area density is 5.2 x10 11 tubes/cm 2 .…”

Section: Nmmentioning

confidence: 99%

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From highly efficient impurity-free CNT synthesis to DWNT forests, CNT solids, and super-capacitors

Hata

2007

SPIE Proceedings

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We demonstrate an extremely efficient chemical vapour deposition synthesis of single-walled carbon nanotubes where the activity and lifetime of the catalysts are enhanced by controlling the ambient of the CVD furnace, a growth mode we call "Super Growth" [1]. The enhanced catalytic activity of super growth results in massive growth of super-dense and vertically-aligned single-walled nanotubes forests with heights up to 2.5 millimeters. In addition, these SWNT forests were easily separated from the catalysts, producing the most pure SWNT material (over 99.98%) ever made, through an all-dry process without any purification. Moreover, patterned highly organized intrinsic single-walled nanotube structures were successfully fabricated. Super Growth simultaneously addresses many critical problems such as scalability, purity, and cost, and opens up innumerable opportunities ranging from fundamental research to real applications.

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Section: Methodsmentioning

confidence: 90%

Section: Nmmentioning

confidence: 99%