Jpn. J. Appl. Phys. 47 (2008) pp. 1937-1940 |Previous Article| |Next Article| |Table of Contents|
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Selected Topics in Applied Physics
Advances in Carbon Nanotube Applications
Effect of Residual Acetylene Gas on Growth of Vertically Aligned Carbon Nanotubes
Masao Yamaguchi1,
Lujun Pan1,
Seiji Akita1, and
Yoshikazu Nakayama1,2
1Department of Physics and Electronics, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai 599-8531, Japan
2Department of Mechanical Engineering, Osaka University, 1-1 Yamada-oka, Suita, Osaka 565-0871, Japan
(Received October 11, 2007; accepted December 15, 2007; published online April 18, 2008)
We have investigated the effect of residual reaction gas on the growth of vertically aligned carbon nanotubes (CNTs) synthesized by chemical vapor deposition (CVD). The concentration of acetylene resident in gas lines and a CVD chamber decreased exponentially with time and even a small amount of residual acetylene affects the CNT growth. The residual acetylene reacts with the catalyst particles of Fe and reduces the catalytic activity of Fe particles under the temperature of 500 °C. As a result, both the length and bulk density of the grown CNTs decreased with increasing residual acetylene concentration.
URL:
http://jjap.jsap.jp/link?JJAP/47/1937/
DOI: 10.1143/JJAP.47.1937
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