Microstructure and microscopic deposition mechanism of twist-shaped carbon nanocoils based on the observation of helical nanoparticles on the growth tips

Yang, Shihao; Chen, X.; Kusunoki, Michiko; Yamamoto, Kazunori; Iwanaga, Hiroshi; Motojima, Seiji

doi:10.1016/j.carbon.2004.11.040

Cited by 26 publications

(21 citation statements)

References 13 publications

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“…anisotropic facet catalytic activity of ␣-Fe, in accordance with the helical growth model proposed by Motojima's group (Yang et al, 2005;Kawaguchi et al, 1992). Interestingly, when two "arc" HCNTs are symmetrically grown from one catalyst nanoparticle (Fig.…”

Section: Resultssupporting

confidence: 85%

Synthesis of heterostructured helical carbon nanotubes by iron-catalyzed ethanol decomposition

Zhang

Liu

Zhang

2011

Micron

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Section: Resultssupporting

confidence: 85%

Synthesis of heterostructured helical carbon nanotubes by iron-catalyzed ethanol decomposition

Zhang

Liu

Zhang

2011

Micron

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“…In other words, the very fine catalyst particles formed by the solution process are required to grow to a certain size to initiate the growth of helical CNFs with a diameter of 100 nm. This agrees well with previous reports of the formation of helical CNFs with diameters of about 100 nm [10][11][12][13][14].…”

Section: Discussionsupporting

confidence: 93%

“…Recently, helical CNFs were synthesized intentionally using metallic catalysts, including Fe-based alloys [10], Zn [11], Cu [7,12,13], Pd [14], and Ni [15]. In the case of Cu catalysts, Ni-Cu alloy catalysts containing more than 25 at.% Cu or surface-enriched with Cu have been reported to produce octopus carbon with poor crystallinity [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Growth of helical carbon nanofibers in the presence of Ni−Cu catalysts

et al. 2006

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Carbon nanofibers (CNFs) are synthesized by the dissociation of ethylene gas in the presence of Ni-Cu alloy catalysts; helical CNFs are favored by Ni-Cu alloy catalysts. The role of alloy compositions and reaction time in the morphology of CNFs were determined by varying both the Cu content in the alloy catalyst and the holding time at a particular synthesis temperature. The chemical composition, the size, and the shape of the catalyst particles were shown to affect the morphology of CNFs. Two kinds of growth mechanism are suggested to explain the growth of helical and straight CNFs.

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“…In 2002, Motojima and co-workers 4,21 proposed an acceptable growth mechanism for the carbon microcoils based on the crystal faces of the catalyst grain. Similar analogy could be extended to the present case of springlike CNFs.…”

Section: 2mentioning

confidence: 99%

Photoluminescence and electron paramagnetic resonance studies of springlike carbon nanofibers

Shanker

Arora

Haranath

2009

Applied Physics Letters

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Carbon nanofiber ͑CNF͒ with springlike and double-helix structures has been synthesized by catalytic thermal pyrolysis of an acetylene precursor at 850-950°C using iron nanopowder and thiophene as catalyst and promoter, respectively. High resolution electron microscopy revealed a higher d-spacing ͑ϳ3.46 Å͒ of ͑002͒ crystal plane than customary multiwalled carbon nanotube ͑MWCNT͒ ͑3.37 Å͒ that helps in sustaining mechanical shocks better than MWCNTs. The large surface to volume ratio of springlike CNF does provide many delocalized free electrons to enhance the photoluminescence activity. Electron paramagnetic resonance signal showed a single narrow line having g-value 2.0024Ϯ 0.0002 and spin contribution 3.4956ϫ 10 −16 spins/ g.

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Microstructure and microscopic deposition mechanism of twist-shaped carbon nanocoils based on the observation of helical nanoparticles on the growth tips

Cited by 26 publications

References 13 publications

Synthesis of heterostructured helical carbon nanotubes by iron-catalyzed ethanol decomposition

Synthesis of heterostructured helical carbon nanotubes by iron-catalyzed ethanol decomposition

Growth of helical carbon nanofibers in the presence of Ni−Cu catalysts

Photoluminescence and electron paramagnetic resonance studies of springlike carbon nanofibers

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