Growth of spiral carbon tubes by a mixed-valent oxide-catalytic carbonization process

Wang, Zhong Lin; Kang, Zhaofeng

doi:10.1080/01418639608240327

Cited by 22 publications

(7 citation statements)

References 21 publications

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“…Nondecorated vermicular tubes were already reported, for example, by Wang and Kang 30. In contrast to their observations, our observation of decorated C:N nanotubes is unique.…”

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confidence: 59%

Influence of Nitrogen on the Growth Mechanism of Decorated C:N Nanotubes

Kurt

Karimi

2001

ChemPhysChem

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Nanotubes like feather boas were synthesised by the decomposition of methane in a nitrogen atmosphere using a bias‐enhanced hot‐filament chemical vapour deposition technique. This new type of slightly nitrogenated carbon (C:N) nanotubes exhibits a vermicular shape. Graphitic thin foils growing perpendicular to the tube axis typically cover the surface of each C:N tube. High‐resolution transmission electron microscopy reveals the graphitic structure to be characterised by strong disorder at different length scales. The role of small amounts of nitrogen, which affects the structural formation of the growing C:N tubes, is discussed.

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“…Nondecorated vermicular tubes were already reported, for example, by Wang and Kang 30. In contrast to their observations, our observation of decorated C:N nanotubes is unique.…”

contrasting

confidence: 59%

Influence of Nitrogen on the Growth Mechanism of Decorated C:N Nanotubes

Kurt

Karimi

2001

ChemPhysChem

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“…The initial growth of the tube involves a spiral growth scheme similar to that first proposed by Kroto and McKay 5 and later used to explain the growth of carbon spheres and carbon ropes. 6 Figure 1͑c͒ is a high-resolution TEM image of the bottom tip of the Ni catalyst. The graphitc sheets are seen to align parallel to the faces of the Ni particle.…”

mentioning

confidence: 99%

“…The spiral growth mechanism introduced by Wang and Kang 6 to explain the formation of carbon nanospheres and ropes can be modified to explain the nucleation of the carbon tubules. The Ni particles in Fig.…”

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confidence: 99%

Catalytically active nickel {110} surfaces in growth of carbon tubular structures

Kuang

Wang

Bai

et al. 2000

Applied Physics Letters

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Recent interest in the growth of aligned carbon nanotube films using transition metal catalysts has led to questions concerning the growth mechanism involved. In our experiment carbon tubules grown using Ni catalysts exhibit a preferred orientation relative to the catalytically active surfaces of Ni. The axial directions of the tubular structure are mainly parallel to the ͗110͘ and ͗042͘ directions of Ni. The faceted shape of the Ni particles determines the intrinsic structure of the tubules. A mechanism involving spiral growth is proposed to explain the nucleation and growth of such tubules.

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“…Another idea used to explain the formation of helical CNT is based on the concept of pentagon–heptagon pairing . When pentagonal and heptagonal carbon rings are introduced into the matrix of hexagons (in the planar sheet of graphite structure), carbon surfaces with positive and negative curvatures are produced, respectively.…”

Section: Growth Mechanisms Of Cnfsmentioning

confidence: 99%

“…It was predicted theoretically that the geometrical combinations of these three types of carbon rings are expected to form a variety of fullerene structures. Experimentally it has been approved . For example, Gao et al showed that the catalyst particle is not necessary for the nucleation of carbon structures.…”

Section: Growth Mechanisms Of Cnfsmentioning

confidence: 99%

CVD growth of carbon nanofibers

Jiang

2014

Phys. Status Solidi A

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This review summarizes the growth and structural properties of carbon nanofibers (CNFs) using microwave plasma‐enhanced chemical vapor deposition (MPCVD) technique and metal particles as the catalysts. The reaction gases were hydrocarbon and H2. Depending on catalyst materials, different types of CNFs have been grown. A four‐step growth mechanism, namely adsorption, desorption, diffusion, and precipitation, is proposed to demonstrate the growth of CNFs under those conditions. The growth of carbon nanohelices (CNHs) is explained by the hexahedron morphology of the catalyst particles and difference in growth velocities on crystallographic surface planes. The appeared and potential applications of CNFs are outlined at the end of this review.

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Growth of spiral carbon tubes by a mixed-valent oxide-catalytic carbonization process

Cited by 22 publications

References 21 publications

Influence of Nitrogen on the Growth Mechanism of Decorated C:N Nanotubes

Influence of Nitrogen on the Growth Mechanism of Decorated C:N Nanotubes

Catalytically active nickel {110} surfaces in growth of carbon tubular structures

CVD growth of carbon nanofibers

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