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Effect of Mo in Co-Mo/MgO catalysts on the synthesis yield and structure of carbon nanotubes


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Title: Effect of Mo in Co-Mo/MgO catalysts on the synthesis yield and structure of carbon nanotubes
Authors: Baba, Masataka / Sano, Hideaki / Zheng, Guo-Bin / Uchiyama, Yasuo
Issue Date: May-2009
Publisher: 日本セラミックス協会
Citation: Journal of the Ceramic Society of Japan, 117(1365), pp.654-658; 2009
Abstract: Carbon nanotubes (CNTs) were synthesized at 650-770°C using Co/MgO and Co-Mo/MgO as catalysts and ethylene as carbon source. The dependence of the carbon yield on Mo amount in catalyst, synthesis temperature and time were investigated, and the structures of CNTs were characterized using FESEM, TEM, and Raman spectroscopy. It was found that CNTs with "bamboo-like" structure were synthesized using Co-Mo/MgO catalysts, in contrast to typical multi-walled carbon nanotubes with hollow inner tube obtained from Co/MgO catalyst. Addition of 5-10% Mo in catalysts resulted in the highest carbon yield, e.g. 5500% for 60 min synthesis, which is about 20 times higher than that of Co/MgO. The addition of Mo also extended the lifespan of catalyst for the growth of CNTs. TEM observation showed that the growth of CNTs was in a root-growth mode. The structure of CNTs obtained from Co-Mo/MgO catalysts was explained based on the growth mechanism of CNTs.
Keywords: Carbon nanotubes / CVD / Catalyst / Co-Mo/MgO
URI: http://hdl.handle.net/10069/22085
ISSN: 18820743
DOI: 10.2109/jcersj2.117.654
Type: Journal Article
Text Version: publisher
Appears in Collections:Articles in academic journal

Citable URI : http://hdl.handle.net/10069/22085

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