Condensed-phase nanotubes

Hsu, Wen Kuang; Hare, Jonathon; Terrones, Mauricio; Kroto, Harold W.; Walton, D. R. M.; Harris, Peter

doi:10.1038/377687a0

Cited by 288 publications

(85 citation statements)

References 4 publications

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“…17b,17c,17f The present method demonstrated several advantages on the production of such a unique heterostructure consisting of metallic Sn nanowires encapsulated in amorphous carbon nanotubes: (1) Unlike the AAM template-based method that uses a two-step process to generate carbon nanotube-nanowire heterostructures, 18 our present method only involves a one-step "in-situ" procedure, without using any external catalysts. (2) Compared with other common filling techniques such as deposition by capillary action, 17a wet-chemistry methods, 19 electrochemical deposition, 20 arc-discharge plasma, 21 and condensed-phase electrolysis, 22 our present method can achieve a very high yield. (3) Our present method allows the growth of high-density heterostructures on various commercially available substrates such as carbon paper and silicon.…”

Section: Resultsmentioning

confidence: 99%

Aligned Heterostructures of Single-Crystalline Tin Nanowires Encapsulated in Amorphous Carbon Nanotubes

Sun

Zhou

et al. 2007

J. Phys. Chem. C

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High-density heterostructures of amorphous carbon nanotubes encapsulated single-crystalline tin nanowires (a-CNT-Sn) have successfully been synthesized by using the simple thermal evaporation of solid tin powder (Sn) and introduction of ethylene gas (C 2 H 4 ). A commercially widely used porous carbon paper, consisting of micrographitic fibers, was employed as growing substrate. The morphology, composition, and structure of the synthesized nano-heterostructures were examined using scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy-dispersive X-ray (EDX) analysis. It was found that the resultant heterostructures are uniformly distributed on graphitic fibers and that these well-defined tin (Sn) nanowires, up to 10 µm in length, are completely covered with amorphous carbon walls of about 30 nm thickness. The hollow features at the tips of such heterostructures were revealed. A growth mechanism has been proposed to explain the growth processes for such novel heterostructures. The synthesis method reported here can be employed to fabricate oriented nanotube arrays filled with other nanowires on a variety of substrates at large scale.

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Section: Resultsmentioning

confidence: 99%

Aligned Heterostructures of Single-Crystalline Tin Nanowires Encapsulated in Amorphous Carbon Nanotubes

Sun

Zhou

et al. 2007

J. Phys. Chem. C

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“…On the contrary, utilising the arc plasma in liquids is a very simple process, allowing low-cost high-yield CNT production. First introduced in 2001, the electric arc discharge in a liquid medium used water [87], followed by molten lithium [88] and liquid nitrogen [89] and deionised water [90]. However, deionized water possesses excellent electrical insulating parameters.…”

Section: Arc Discharge Methodsmentioning

confidence: 99%

Carbon nanotubes for ultrafast fibre lasers

et al. 2016

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Carbon nanotubes (CNTs) possess both remarkable optical properties and high potential for integration in various photonic devices. We overview, here, recent progress in CNT applications in fibre optics putting particular emphasis on fibre lasers. We discuss fabrication and characterisation of different CNTs, development of CNTbased saturable absorbers (CNT-SA), their integration and operation in fibre laser cavities putting emphasis on stateof-the-art fibre lasers, mode locked using CNT-SA. We discuss new design concepts of high-performance ultrafast operation fibre lasers covering ytterbium (Yb), bismuth (Bi), erbium (Er), thulium (Tm) and holmium (Ho)-doped fibre lasers.

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“…CNTs were first identified by M. Endo and his co-workers in the late 1970s [Oberlin et al, 1976] and caused tremendous interest when S. Iijima published his paper in Nature in 1991 [Iijima, 1991]. The synthetic methods for CNTs include the carbon arc-discharge method [Iijima, 1991;Kroto et al, 1985], laser vaporization of a graphite electrode [Thess et al, 1996] and the chemical vapour-deposition methods from various carbon precursors [Baker et al, 1972;Yacaman et al, 1993;Hsu et al, 1995;Pigney et al, 1997;Colomer et al, 1998]. CNTs have many structures, differing in length, thickness, spiral types and number of layers; although they are formed from essentially the same graphite sheet [Saito et al, 1992;Zhang et al, 1993;Bernholc at al., 1997;Rao et al, 1996;iijima, 1992].…”

Section: Carbon Nanotubesmentioning

confidence: 99%