Growth of regularly coiled carbon filaments by Ni catalyzed pyrolysis of acetylene, and their morphology and extension characteristics

Motojima, Seiji; Kawaguchi, Masayuki; Nozaki, Koji; Iwanaga, Hiroshi

doi:10.1063/1.102816

Cited by 191 publications

(100 citation statements)

References 4 publications

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“…The tensile properties of helical diamond microfibers several millimeters in length and having a wire core of platinum have been discussed. 8 Nakayama et al 9 presented a brief report on the mechanical properties of carbon nanocoils, and Motojima et al 10 described the mechanical response of carbon microcoils under extension. Amorphous helical SiO 2 nanosprings have also been recently characterized by scanning and transmission electron microscopy and atomic force microscopy 11 .…”

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confidence: 99%

Mechanics of a Carbon Nanocoil

Chen

Zhang²,

Dikin³

et al. 2003

Nano Lett.

340

249

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An individual carbon nanocoil was clamped between two AFM cantilevers and loaded in tension to a maximum relative elongation of ∼42%. The deformation of the nanocoil agrees well with an analytical model of the spring constant that accounts for the geometric nonlinearity. The nanocoil behaves like an elastic spring with a spring constant K of 0.12 N/m in the low strain region. No plastic deformation was detected. High-resolution microscopy images and the electron energy loss spectrum (EELS) indicate that the nanocoils are amorphous with a sp 2 /sp 3 bonded-carbon ratio of ∼4:1.

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mentioning

confidence: 99%

Mechanics of a Carbon Nanocoil

Chen

Zhang²,

Dikin³

et al. 2003

Nano Lett.

340

249

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“…20) The preparation conditions, morphology, growth mechanism, microstructure and some properties of the CMCs were examined in detail.…”

Section: Jcs-japanmentioning

confidence: 99%

Development of ceramic microcoils with 3D-herical/spiral structures

Motojima

2008

J. Ceram. Soc. Japan

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Various modified CVD processes, such as modified hot filament method, vapor phase diffusion process, in-situ CVD process, catalytic CVD process, for the preparation of ceramics single crystals and fibers were developed. The preparation conditions, morphologies, microstructure and properties of transition metal carbides, nitrides, borides, silicides, sulfides, etc were examined. We have first found that various ceramic fibers with 3D-helical/spiral structure, such as Si3N4, carbon, TiC, TiO2, etc. were obtained using metal-catalyzed CVD and/or vapor phase diffusion processes under critically controlled reaction conditions. Carbon microcoils (CMC) with double-helical structure were obtained with high reproducibility by metal catalyzed pyrolysis of acetylene. The CMCs have many interesting and eminent characteristics, such as 3D-helical/spiral microstructure with μm orders in coil diameters, diverse microstructures from amorphous to graphite structure, changing in electrical parameters under the application of various stimuli, high microwave absorption and microwave heating abilities, breeding or anti-breeding effect on cells, fibrils of organisms, etc.

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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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Growth of regularly coiled carbon filaments by Ni catalyzed pyrolysis of acetylene, and their morphology and extension characteristics

Cited by 191 publications

References 4 publications

Mechanics of a Carbon Nanocoil

Mechanics of a Carbon Nanocoil

Development of ceramic microcoils with 3D-herical/spiral structures

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

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