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Investigating the Growth Process of Vertically Aligned Single-Walled Carbon Nanotubes Synthesized from Alcohol

Published online by Cambridge University Press:  01 February 2011

Erik Einarsson
Affiliation:
erik@photon.t.u-tokyo.ac.jp, The University of Tokyo, Mechanical Engineering, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan, +81-3-5841-6408, +81-3-5841-6408
Rong Xiang
Affiliation:
xiangrong@photon.t.u-tokyo.ac.jp, The University of Tokyo, Dept. of Mechanical Engineering, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
Kazuaki Ogura
Affiliation:
ogura@photon.t.u-tokyo.ac.jp, The University of Tokyo, Dept. of Mechanical Engineering, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
Jun Okawa
Affiliation:
ookawa@photon.t.u-tokyo.ac.jp, The University of Tokyo, Dept. of Mechanical Engineering, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
Zhengyi Zhang
Affiliation:
zhengyi@photon.t.u-tokyo.ac.jp, The University of Tokyo, Dept. of Mechanical Engineering, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
Shigeo Maruyama
Affiliation:
maruyama@photon.t.u-tokyo.ac.jp, The University of Tokyo, Dept. of Mechanical Engineering, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
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Abstract

We have performed a systematic investigation of the influence of the growth parameters on the synthesis of vertically aligned single-walled carbon nanotubes (VA-SWNTs) by the alcohol catalytic chemical vapor deposition (ACCVD) method. The growth process of the VA-SWNTs was monitored using an in situ optical absorbance technique and the effects of CVD temperature and ethanol pressure on the initial growth rate and the catalyst lifetime were investigated. We found that for a given CVD temperature, there is an optimum pressure at which the VA-SWNT film height is maximized, and this pressure increases with temperature. Below this optimum pressure the growth reaction is first-order, with the arrival of ethanol to the catalyst being the rate-limiting step. The activation energy of the growth was also determined to be approximately 1.5 eV.

The root-growth mechanism of VA-SWNTs by the alcohol CVD method was also confirmed by a two-stage growth process. Following a short growth period using normal ethanol, isotope labeled 13C ethanol was introduced to continue the growth. The location of the 13C was confirmed by resonance Raman spectroscopy, confirming the root-growth mechanism.

Type
Research Article
Copyright
Copyright © Materials Research Society 2008

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