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In situ XANES Analysis of Co and Ni Catalysts during Single-Walled Carbon Nanotube Growth

Published online by Cambridge University Press:  02 January 2018

Makoto Kumakura ,
Hoshimitsu Kiribayashi ,
Takahiro Saida ,
Shigeya Naritsuka  and
Takahiro Maruyama
Makoto Kumakura*
Affiliation:
Department of Materials Science and Engineering, Meijo University, 1-501 Shiogamaguchi, Tempaku, Nagoya468-8502, Japan
Hoshimitsu Kiribayashi
Affiliation:
Department of Materials Science and Engineering, Meijo University, 1-501 Shiogamaguchi, Tempaku, Nagoya468-8502, Japan
Takahiro Saida
Affiliation:
Department of Applied Chemistry, Meijo University, 1-501 Shiogamaguchi, Tempaku, Nagoya468-8502, Japan
Shigeya Naritsuka
Affiliation:
Department of Materials Science and Engineering, Meijo University, 1-501 Shiogamaguchi, Tempaku, Nagoya468-8502, Japan
Takahiro Maruyama
Affiliation:
Department of Applied Chemistry, Meijo University, 1-501 Shiogamaguchi, Tempaku, Nagoya468-8502, Japan
*
*(Email: [email protected])
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Abstract

In situ X-ray absorption near edge structure (XANES) measurements were conducted to elucidate the chemical states of Co and Ni catalysts during single-walled carbon nanotube (SWCNT) growth via chemical vapor deposition (CVD). XANES spectra indicated that both Co and Ni catalysts partially oxidized before heating. It was found that Co catalysts formed carbides during the SWCNT growth. In contrast, Ni catalysts remained metallic state even after the SWCNT growth had begun. These results indicate that during SWCNT growth, carbon atoms dissolve into Co particles, whereas for Ni particles, they diffuse on the surface region. It was concluded that the growth mechanisms of SWCNTs formed by CVD differed for either Co or Ni catalyst.

Keywords

catalyticnanostructurechemical vapor deposition (CVD) (chemical reaction)
Type
Articles
Information
MRS Advances , Volume 3 , Issue 1-2: Nanomaterials , 2018 , pp. 13 - 18
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Copyright
Copyright © Materials Research Society 2017 

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