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Modulation of carbon nanotube yield and type through the collective effects of initially deposited catalyst amount and MgO underlayer annealing temperature

Published online by Cambridge University Press:  04 December 2018

Takashi Tsuji ,
Guohai Chen ,
Kenji Hata ,
Don N. Futaba  and
Shunsuke Sakurai
Takashi Tsuji
Affiliation:
CNT–Application Research Centre, National Institute of Advanced Industrial Science and Technology (AIST), Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8565, Japan
Guohai Chen
Affiliation:
CNT–Application Research Centre, National Institute of Advanced Industrial Science and Technology (AIST), Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8565, Japan
Kenji Hata
Affiliation:
CNT–Application Research Centre, National Institute of Advanced Industrial Science and Technology (AIST), Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8565, Japan
Don N. Futaba*
Affiliation:
CNT–Application Research Centre, National Institute of Advanced Industrial Science and Technology (AIST), Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8565, Japan
Shunsuke Sakurai
Affiliation:
CNT–Application Research Centre, National Institute of Advanced Industrial Science and Technology (AIST), Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8565, Japan
*
*(Email: d-futaba@aist.go.jp)
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Abstract

Recently, the millimetre-scale, highly efficient growth of single-wall carbon nanotube (SWCNT) forests from iron (Fe) catalysts has been reported through the annealing of the magnesia (MgO) underlayer. Here, we report the modulation of the CNT yield (height) and average number of CNT walls for a Fe/MgO catalyst system through the collective effects of initial Fe amount and MgO annealing temperature. Our results revealed the existence of a well-defined region for high yield SWCNT forest growth in the domain of deposited Fe thickness and MgO annealing temperature. Through topographic examinations of the catalyst surface using atomic force microscopy, we confirmed that our results stem from the collective effects of increased amounts of surface-bound Fe through the amount of deposition and suppression of Fe subsurface diffusion, together govern the amount of surface-bound catalyst. The combination of these mechanisms determined the final nanoparticle size, density, and stability and could explain the three distinctly defined regions: low yield SWCNT growth, high yield SWCNT growth, and high yield multiwall CNT growth. Furthermore, we explained the observed borders between these three regions.

Keywords

Cchemical vapor deposition (CVD) (chemical reaction)
Type
Articles
Information
MRS Advances , Volume 4 , Issue 3-4: Nanomaterials , 2019 , pp. 139 - 146
Copyright
Copyright © Materials Research Society 2018 

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