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In-Hwang, W.; Kuzuya, T.; Iwanaga, Hiroshi; Motojima, Seiji

doi:10.1023/a:1004879924948

Cited by 8 publications

(4 citation statements)

References 12 publications

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“…It was observed that, in the apparent microstructure of the carbon microcoils, the development of the graphite layers and their regular orientations suggest that the growth mechanism could be obtained by high-temperature treatment and partial oxidation. [16,17] Generally, by the partial oxidation of the heat-treated carbon coils, the amorphous part, grain boundary, or highly stressed parts of the heat-treated carbon coils are more easily oxidized than the bulk graphite layers, and thus an apparent development and a regular orientation of the graphite layers can be clearly observed. Accordingly, the as-grown carbon nanocoils obtained with Au and Ni/Au catalysts were heat treated at 2500 C, in a N 2 atmosphere for 8 h. The heat-treated carbon nanocoils were then partly oxidized at 600 C in air, for 15 min.…”

Section: Heat and Oxidation Treatmentsmentioning

confidence: 99%

“…A piece of the heat-treated carbon nanocoil always has ruptured tips of both the pyramidal and cavity forms, as in the case of the carbon microcoils. [16,17] Many stripes, which incline regularly at about 50 degrees to the fiber axis, can be seen on the surface. Each of these stripes is a piece of a graphite layer.…”

Section: Heat and Oxidation Treatmentsmentioning

confidence: 99%

“…This morphology significantly resembles that of the heat-treated and oxidized carbon microcoils, in which the graphite layers are inclined 10±40 degrees to the fiber axis and form the herring-bone structure. [16,17] …”

Section: Heat and Oxidation Treatmentsmentioning

confidence: 99%

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Preparation, Morphology, and Growth Mechanism of Carbon Nanocoils

Kuzuya

In-Hwang

Hirako

et al. 2002

Chem. Vap. Deposition

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Carbon nanocoils with a coil diameter of 50±450 nm were prepared by the catalytic pyrolysis of acetylene, and the preparation conditions and morphology were examined. To clarify the growth mechanism, the carbon nanocoils were also heat treated at 2500 C for 8 h in a N 2 atmosphere, then partially oxidized in air at 600 C for 15 min. The carbon nanocoils could be grown at 740±770 C either by applying a magnetic field to the reaction zone or by using sputtered thin films of Au or Au/Ni as a catalyst. Carbon nanocoils are generally single coils, while carbon microcoils are generally double coils. There are two kinds of nanocoils with differing microstructures. One is formed from a carbon fiber with a double microstructure of thin core fiber and clad, while the other is formed from a fiber with a ªherring-boneº structure.

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Section: Heat and Oxidation Treatmentsmentioning

confidence: 99%

Section: Heat and Oxidation Treatmentsmentioning

confidence: 99%

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Preparation, Morphology, and Growth Mechanism of Carbon Nanocoils

Kuzuya

In-Hwang

Hirako

et al. 2002

Chem. Vap. Deposition

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“…Their uniqueness and interesting properties have prompted many researchers to investigate carbon coils [1][2][3][4]. Not unlike other carbon micro-and nano-structures, carbon coils have many potential applications such as micro-springs, micro-sensors, magnetic beam generators, and electromagnetic shielding materials [5].…”

Section: Introductionmentioning

confidence: 99%

Electrodeposition of Ni Catalyst on Tungsten Substrates and Its Effect on the Formation of Carbon Nano- and Micro-coils

et al. 2002

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Carbon micro-coils and nano-coils were produced in high yield from nickel catalyst particles electrochemically deposited onto tungsten substrates. Various electrochemical deposition techniques were used to produce the nickel catalyst particles. These particles catalyzed the chemical vapor deposition (CVD) of acetylene at 800°C, resulting in growth of carbon microand nano-coils. Linear-sweep (cyclic) voltammetry produced catalyst particles which resulted in single-filament coils intermixed with thin nanotubes over most of the substrate surface. Passing the same amount of charge by constant current electrolysis produced nickel particles that decomposed carbon but did not grow coils. Catalyst particles deposited by constant current electrolysis grew nanocoils similar to linear-sweep voltammetry but in small, localized, highyield patches. The coils produced were either spring-like micro-coils of low pitch and large diameter or rope-like nano-coils of higher pitch and smaller diameter. High-resolution transmission electron microscopy (HRTEM) showed typical graphite fringes in the filaments, but did not reveal an internal tubular structure. Catalyst particles were often detected at the ends of the coils.

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Mechanics of Helical Carbon Nanomaterials

Shima

Suda

2016

Advanced Computational Nanomechanics

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Untitled

Cited by 8 publications

References 12 publications

Preparation, Morphology, and Growth Mechanism of Carbon Nanocoils

Preparation, Morphology, and Growth Mechanism of Carbon Nanocoils

Electrodeposition of Ni Catalyst on Tungsten Substrates and Its Effect on the Formation of Carbon Nano- and Micro-coils

Mechanics of Helical Carbon Nanomaterials

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