In Situ Study of Iron Catalysts for Carbon Nanotube Growth Using X-Ray Diffraction Analysis
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概要
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We have investigated how an iron catalyst changes during the growth of vertically aligned carbon nanotubes by in situ measurement of X-ray diffraction. It is found that heating the catalyst film to a growth temperature of 700°C in He atmosphere induces its oxidation beyond 100°C due to adsorbed moisture and changes the film to particles at approximately 600°C. At 700°C, the catalyst particles consist mainly of iron oxide with a cubic system. By feeding C2H2, the catalyst starts to be deoxidized and then absorbs carbon atoms to form Fe-C and Fe3C. The growth mechanism of nanotubes is discussed in terms of the crystalline phase and orientation of the catalyst.
- Japan Society of Applied Physicsの論文
- 2004-04-01
著者
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Pan Lujun
Department Of Physics And Electronics Osaka Prefecture University
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Nakayama Yoshikazu
Department Of Electrical Engineering College Of Engineering University Of Osaka
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OKAZAKI Nobuharu
Innovation Plaza Osaka, Japan Science and Technology Agency
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Nishimura Kenji
Department Of Biology Keio University School Of Medicine
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Okazaki Nobuharu
Innovation Plaza Osaka, Japan Science and Technology Agency, 3-1-10 Techno-stage, Izumi, Osaka 594-1144, Japan
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