TY - JOUR
T1 - Fluidized-bed synthesis of sub-millimeter-long single walled carbon nanotube arrays
AU - Kim, Dong Young
AU - Sugime, Hisashi
AU - Hasegawa, Kei
AU - Osawa, Toshio
AU - Noda, Suguru
N1 - Funding Information:
We gratefully thank Ms. Asuka Tashiro for her help in some experiments. This work is financially supported by Nanotech Challenge (No. 07005623-0 ) by NEDO, Japan, by cooperative research project with Hitachi Chemical, Co., Ltd., Japan, by KAKENHI (Nos. 18686062 and 21686074 ), by MEXT, Japan, and by ALCA by JST, Japan.
PY - 2012/4
Y1 - 2012/4
N2 - The rapid growth method for vertically aligned, single walled carbon nanotube (SWCNT) arrays on flat substrates was applied to a fluidized-bed, using ceramic beads as catalyst supports as a means to mass produce sub-millimeter-long SWCNT arrays. Fe/Al 2O x catalysts were deposited on the surface of Al 2O 3 beads by sputtering and SWCNTs were grown on the beads by chemical vapor deposition (CVD) using C 2H 2 as a feedstock. Scanning electron microscopy and transmission electron microscopy showed that SWCNTs of 2-4 nm in diameter grew and formed vertically aligned arrays of 0.5 mm in height. Thermogravimetric analysis showed that the SWCNTs had a catalyst impurity level below 1 wt.%. Furthermore, they were synthesized at a carbon yield as high as 65 at.% with a gas residence time as short as <0.2 s. Our fluidized-bed CVD, which efficiently utilizes the three-dimensional space of the reactor volume while retaining the characteristics of SWCNTs on substrates, is a promising option for mass-production of high-purity, sub-millimeter-long SWCNT arrays.
AB - The rapid growth method for vertically aligned, single walled carbon nanotube (SWCNT) arrays on flat substrates was applied to a fluidized-bed, using ceramic beads as catalyst supports as a means to mass produce sub-millimeter-long SWCNT arrays. Fe/Al 2O x catalysts were deposited on the surface of Al 2O 3 beads by sputtering and SWCNTs were grown on the beads by chemical vapor deposition (CVD) using C 2H 2 as a feedstock. Scanning electron microscopy and transmission electron microscopy showed that SWCNTs of 2-4 nm in diameter grew and formed vertically aligned arrays of 0.5 mm in height. Thermogravimetric analysis showed that the SWCNTs had a catalyst impurity level below 1 wt.%. Furthermore, they were synthesized at a carbon yield as high as 65 at.% with a gas residence time as short as <0.2 s. Our fluidized-bed CVD, which efficiently utilizes the three-dimensional space of the reactor volume while retaining the characteristics of SWCNTs on substrates, is a promising option for mass-production of high-purity, sub-millimeter-long SWCNT arrays.
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U2 - 10.1016/j.carbon.2011.11.032
DO - 10.1016/j.carbon.2011.11.032
M3 - Article
AN - SCOPUS:84855850697
SN - 0008-6223
VL - 50
SP - 1538
EP - 1545
JO - Carbon
JF - Carbon
IS - 4
ER -