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Jpn. J. Appl. Phys. 47 (2008) pp. 1966-1970  |Previous Article| |Next Article|  |Table of Contents|
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Selected Topics in Applied Physics

Advances in Carbon Nanotube Applications

Effect of Ambient Gas on the Catalytic Properties of Au in Single-Walled Carbon Nanotube Growth

Huaping Liu, Tomohito Chokan, Daisuke Takagi, Hiroshi Ohno, Shohei Chiashi, and Yoshikazu Homma1

Department of Physics, Tokyo University of Science, Shinjuku, Tokyo 162-8601, Japan
1CREST, JST, Chiyoda, Tokyo 102-0075, Japan

(Received October 22, 2007; accepted December 15, 2007; published online April 18, 2008)

We investigated the effects of ambient gases on the catalytic properties of Au in the synthesis of single-walled carbon nanotubes (SWCNTs). We found that H2 could effectively activate the Au catalyst during both the pretreatment stage and the chemical vapor deposition (CVD) process, and increase the nucleation density of SWCNTs. When Au is used as catalyst, a H2 atmosphere is crucial for the synthesis of high-density SWCNTs. At the same time, it is also found that heating in air during pretreatment can efficiently remove contaminant carbon and improve the purity of the resulting SWCNTs. Furthermore, an air atmosphere during annealing treatment can suppress the agglomeration of Au particles, which is useful for synthesizing high-density nanotubes.

URL: http://jjap.jsap.jp/link?JJAP/47/1966/
DOI: 10.1143/JJAP.47.1966


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