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Effect of MoO3 as conditioning catalyst on synthesis of carbon nanotubes

Published online by Cambridge University Press:  31 January 2011

Yunfang Liu ,
Kenji Takeuchi ,
Ki Chul Park ,
Hiroyuki Muramatsu ,
Tomoyuki Fukuyo  and
Morinobu Endo
Yunfang Liu
Affiliation:
Faculty of Engineering, Shinshu University, Nagano-shi 380-8553, Japan
Kenji Takeuchi
Affiliation:
Faculty of Engineering, Shinshu University, Nagano-shi 380-8553, Japan
Ki Chul Park
Affiliation:
Faculty of Engineering, Shinshu University, Nagano-shi 380-8553, Japan
Hiroyuki Muramatsu
Affiliation:
Faculty of Engineering, Shinshu University, Nagano-shi 380-8553, Japan
Tomoyuki Fukuyo
Affiliation:
MEFS Co., Ltd., Nagano-shi 380-0921, Japan
Morinobu Endo*
Affiliation:
Faculty of Engineering, Shinshu University, Nagano-shi 380-8553, Japan
*
a) Address all correspondence to this author. e-mail: endo@endomoribu.shinshu-u.ac.jp
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Abstract

The effect of nonsupported MoO3 as a conditioning catalyst on the preparation of carbon nanotubes (CNTs) using a common main catalyst Fe/MgO was investigated. Without using MoO3, only single-walled CNTs were produced at low yield. In contrast, the use of MoO3 provided single-walled and double-walled CNTs at high yield. The MoO3 conditioning catalyst enhances not only the yield but also the diameter and layer number of CNTs. The higher yield formation of more layered CNTs with larger diameter would be attributed to the preproduction of reactive hydrocarbon species by the conditioning catalyst and their growth to larger molecular-weight reactive species.

Keywords

CatalyticChemical vapor deposition (CVD) (deposition)Nanostructure
Type
Rapid Communications
Information
Journal of Materials Research , Volume 24 , Issue 4 , April 2009 , pp. 1307 - 1310
Copyright
Copyright © Materials Research Society 2009

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