Low-temperature synthesis of multiwalled carbon nanotubes by graphite antenna CVD in a hydrogen-free atmosphere

Daisuke Yokoyama; Takayuki Iwasaki; Kentaro Ishimaru; Shintaro Sato; Mizuhisa Nihei; Yuji Awano; Hiroshi Kawarada

doi:10.1016/j.carbon.2009.10.035

Low-temperature synthesis of multiwalled carbon nanotubes by graphite antenna CVD in a hydrogen-free atmosphere

Daisuke Yokoyama, Takayuki Iwasaki, Kentaro Ishimaru, Shintaro Sato, Mizuhisa Nihei, Yuji Awano, Hiroshi Kawarada

Research output: Contribution to journal › Article › peer-review

14 Citations (Scopus)

Abstract

Multiwalled carbon nanotubes (MWCNTs) were synthesized at 390 °C in a hydrogen-free atmosphere by graphite antenna chemical vapor deposition, which provides carbon radicals by the etching of the antenna itself in a He- or Ar-based noble gas plasma. An increase in the number of defects in the graphite layers of the CNTs was observed with increasing hydrogen partial pressure. The results of X-ray photoelectron spectroscopy analysis suggested that these defects were caused by the transformation from an sp² to an sp³ structure in the graphite layers of CNTs due to hydrogen radicals.

Original language	English
Pages (from-to)	825-831
Number of pages	7
Journal	Carbon
Volume	48
Issue number	3
DOIs	https://doi.org/10.1016/j.carbon.2009.10.035
Publication status	Published - 2010 Mar
Externally published	Yes

ASJC Scopus subject areas

Chemistry(all)
Materials Science(all)

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10.1016/j.carbon.2009.10.035

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title = "Low-temperature synthesis of multiwalled carbon nanotubes by graphite antenna CVD in a hydrogen-free atmosphere",

abstract = "Multiwalled carbon nanotubes (MWCNTs) were synthesized at 390 °C in a hydrogen-free atmosphere by graphite antenna chemical vapor deposition, which provides carbon radicals by the etching of the antenna itself in a He- or Ar-based noble gas plasma. An increase in the number of defects in the graphite layers of the CNTs was observed with increasing hydrogen partial pressure. The results of X-ray photoelectron spectroscopy analysis suggested that these defects were caused by the transformation from an sp2 to an sp3 structure in the graphite layers of CNTs due to hydrogen radicals.",

author = "Daisuke Yokoyama and Takayuki Iwasaki and Kentaro Ishimaru and Shintaro Sato and Mizuhisa Nihei and Yuji Awano and Hiroshi Kawarada",

note = "Funding Information: This work was completed as part of the MIRAI Project supported by NEDO. TEM observation was supported by Mineichi Fujiwara at Kagami Memorial Laboratory for Materials Science and Technology, Waseda University.",

year = "2010",

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doi = "10.1016/j.carbon.2009.10.035",

language = "English",

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T1 - Low-temperature synthesis of multiwalled carbon nanotubes by graphite antenna CVD in a hydrogen-free atmosphere

AU - Yokoyama, Daisuke

AU - Iwasaki, Takayuki

AU - Ishimaru, Kentaro

AU - Sato, Shintaro

AU - Nihei, Mizuhisa

AU - Awano, Yuji

AU - Kawarada, Hiroshi

N1 - Funding Information: This work was completed as part of the MIRAI Project supported by NEDO. TEM observation was supported by Mineichi Fujiwara at Kagami Memorial Laboratory for Materials Science and Technology, Waseda University.

PY - 2010/3

Y1 - 2010/3

N2 - Multiwalled carbon nanotubes (MWCNTs) were synthesized at 390 °C in a hydrogen-free atmosphere by graphite antenna chemical vapor deposition, which provides carbon radicals by the etching of the antenna itself in a He- or Ar-based noble gas plasma. An increase in the number of defects in the graphite layers of the CNTs was observed with increasing hydrogen partial pressure. The results of X-ray photoelectron spectroscopy analysis suggested that these defects were caused by the transformation from an sp2 to an sp3 structure in the graphite layers of CNTs due to hydrogen radicals.

AB - Multiwalled carbon nanotubes (MWCNTs) were synthesized at 390 °C in a hydrogen-free atmosphere by graphite antenna chemical vapor deposition, which provides carbon radicals by the etching of the antenna itself in a He- or Ar-based noble gas plasma. An increase in the number of defects in the graphite layers of the CNTs was observed with increasing hydrogen partial pressure. The results of X-ray photoelectron spectroscopy analysis suggested that these defects were caused by the transformation from an sp2 to an sp3 structure in the graphite layers of CNTs due to hydrogen radicals.

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Low-temperature synthesis of multiwalled carbon nanotubes by graphite antenna CVD in a hydrogen-free atmosphere

Abstract

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