Well‐aligned carbon nanotubules

Hwang, Jyun‐Hwei; Hsu, Wen-Kuan; Mou, Chung Yuan

doi:10.1002/adma.19930050910

Advanced Materials

1993

DOI: 10.1002/adma.19930050910

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Well‐aligned carbon nanotubules

Jyun‐Hwei Hwang

Wen-Kuan Hsu

Chung Yuan Mou

Abstract: Well-Aligned Carbon Nanotubules**

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Cited by 5 publications

(2 citation statements)

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“…The arc-discharge method developed for C 60 synthesis supplied a very surprising result, namely the growth of fullerene tubes on the carbon cathode [3,[11][12][13][14]. Other nanotube synthesis methods were also used such as plasma decomposition of hydrocarbons [15,16] and co-evaporating a catalyst during a carbon arc-discharge [17][18][19][20][21]. Single-wall nanotubes could be produced by the catalytic method evaporating cobalt or iron in the system.…”

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confidence: 99%

Synthesis of single- and multi-wall carbon nanotubes over supported catalysts

Fonseca

Hernádi

Piedigrosso

et al. 1998

Applied Physics A: Materials Science & Processing

163

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Catalytic synthesis and some characterization of multi-and single-wall carbon nanotubes are presented. Supported transition-metal catalysts were prepared by different methods and were tested in the production of nanotubes by decomposition of hydrocarbons at 700 • C, using a fixed-bed flow reactor.The quantities of deposited carbon were measured and the quality of the nanotubes was characterized by means of transmission electron microscopy and scanning tunneling microscopy. The inner and outer diameters of the nanotubes were also measured and the diameter distribution histograms were established. The multi-wall straight and coiled nanotubes were found to be quite regular with an average inner (outer) diameter of 4-7 nm (15-25 nm) and with lengths up to 50 µm. The walls contain concentric cylindrical graphene sheets separated by the graphitic interlayer distance. The single-wall nanotubes were found as bundles of hundreds of aligned straight 1-nm-diameter nanotubes with lengths up to 1-µm.The influence of various parameters such as the method of catalyst preparation, the nature and the pore size of the support, the nature of the metal, the quantity of catalyst active particles, and the reaction conditions on the nanotubes formation were studied. The numbers and dimensions of the catalyst active particles dispersed on the support were found to be of importance in regulating the shape of the produced nanotubes. Following these results, a model of growth mechanism was suggested for the nanotubes obtained by this method.The recent discovery of fullerenes [1], fullerenic onions [2], and hollow turbostratic carbon tubes of nanometer diameter [3] opened a new chapter in carbon chemistry. Because of their calculated chemical and physical properties [4][5][6][7], speculations about the possible applications of carbon nanotubes have been reported [8][9][10]. For the synthesis of carbon nanotubes several methods have been reported. The arc-discharge method developed for C 60 synthesis supplied a very surprising result, namely the growth of fullerene tubes on the carbon cathode [3,[11][12][13][14]. Other nanotube synthesis methods were also used such as plasma decomposition of hydrocarbons [15,16] and co-evaporating a catalyst during a carbon arc-discharge [17][18][19][20][21]. Single-wall nanotubes could be produced by the catalytic method evaporating cobalt or iron in the system. Recently, another catalytic process involving decomposition of hydrocarbons over supported catalysts and working under relatively mild conditions has been reported for carbon nanotube production [22,23]. Compared with other synthesis methods, the selectivity of this process to carbon nanotubes is significantly higher [24]. The advantages of the latter method increase if applying zeolites as catalyst supports [25]. Single-and multi-shell nanotubes of regular dimensions are produced by catalytic decomposition of hydrocarbons over Co/Y-zeolite catalysts. ExperimentalDifferent silica-and zeolite-supported transition-metal (Co, Cu, and Fe) catalysts have...

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mentioning

confidence: 99%

Synthesis of single- and multi-wall carbon nanotubes over supported catalysts

Fonseca

Hernádi

Piedigrosso

et al. 1998

Applied Physics A: Materials Science & Processing

163

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show abstract

“…The degree of alignment is expected to improve as the density, and therefore the crystallinity, is increased. Although several methods have been introduced for aligning multiwalled nanotubes, − we are unaware of any other work which describes the postsynthesis alignment of SWNTs. Cheng et al recently grew SWNTs directly from hydrocarbons in ribbons as wide as 100 μm, but the tubes within the ribbons were not nearly as well-aligned or condensed as those described here.…”

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confidence: 99%

Formation of Single-Wall Carbon Nanotube Superbundles

et al. 2000

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Buckypaper and its composites for aeronautic applications

Xia

Zhang

Liu

et al. 2020

Composites Part B: Engineering

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Well‐aligned carbon nanotubules

Abstract: Well-Aligned Carbon Nanotubules**

Cited by 5 publications

References 12 publications

Synthesis of single- and multi-wall carbon nanotubes over supported catalysts

Synthesis of single- and multi-wall carbon nanotubes over supported catalysts

Formation of Single-Wall Carbon Nanotube Superbundles

Buckypaper and its composites for aeronautic applications

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