Synthesis of helical and straight carbon nanofibers by chemical vapor deposition using alkali chloride catalysts

Qin, Yuhua; Zhang, Yongheng; Sun, Xin

doi:10.1007/s00604-008-0078-2

Cited by 12 publications

(8 citation statements)

References 32 publications

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“…The wash with acid cause's detrimental effects on the CNFs and acid is even released into the environment. So water soluble supports, such as sodium chloride [14], potassium chloride [15] and calcium chloride [16], have also been used to synthesize CNFs in order to avoid the use of acid. The basic idea behind using a water soluble support returns to Steigerwalt and Lukehart [17] who employed silicate or carbonate.…”

Section: Introductionmentioning

confidence: 99%

Large Scale Synthesis of Carbon Nanofibres on Sodium Chloride Support

Rajarao

Bhat

2012

Nanomaterials and Nanotechnology

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Large scale synthesis of carbon nanofibres (CNFs) on a sodium chloride support has been achieved. CNFs have been synthesized using metal oxalate (Ni, Co and Fe) as catalyst precursors at 680 C by chemical vapour deposition method. Upon pyrolysis, this catalyst precursors yield catalyst nanoparticles directly. The sodium chloride was used as a catalyst support, it was chosen because of its non-toxic and water soluble nature. Problems, such as the detrimental effect of CNFs, the detrimental effects on the environment and even cost, have been avoided by using a water soluble support. The structure of products was characterized by scanning electron microscopy, transmission electron microscopy and Raman spectroscopy. The purity of the grown products and purified products were determined by the thermal analysis and X-ray diffraction method. Here we report the 7600, 7000 and 6500 wt% yield of CNFs synthesized over nickel, cobalt and iron oxalate. The long, curved and worm shaped CNFs were obtained on Ni, Co and Fe catalysts respectively. The lengthy process of calcination and reduction for the preparation of catalysts is avoided in this method. This synthesis route is simple and economical, hence, it can be used for CNF synthesis in industries.

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Section: Introductionmentioning

confidence: 99%

Large Scale Synthesis of Carbon Nanofibres on Sodium Chloride Support

Rajarao

Bhat

2012

Nanomaterials and Nanotechnology

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“…Because of the complex diversity of carbon nanofibers [4][5][6][7][8][9][10][11][12], we limit our study to those of conical internal geometry. The geometry of an annular cone formed from a graphene disc with bond-length b can be described by three independent parameters (n, m, k).…”

Section: Conical Nanofiber Geometrymentioning

confidence: 99%

“…Among carbon nanostructures there exist structures whose effect on thermal properties is not well established, for example, the conical-helix nanofiber (CHNF). CHNF is an annular structure formed by a helically wound GNR and has been observed in both carbon and boron-nitride nanostructures [5][6][7][8][9][10][11]. Experiments suggest that this nanofiber has radically different thermal properties such as a two orders of magnitude decrease in thermal conductivity compared to that of graphene [7], but its thermal properties have not been fully explored.…”

Section: Introductionmentioning

confidence: 99%

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Non-equilibrium thermal transport simulation of conical carbon nanofibers

Thomas

Yamamoto

Tada

et al. 2013

Trans. Mat. Res. Soc. Japan

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Using non-equilibrium molecular dynamics, we study the thermal transport properties of conical carbon nanofibers, comparing with single-walled carbon nanotubes and graphene nanoribbons. Our results predict that the conical nanofibers have at least a two-order of magnitude smaller thermal conductivity. We then predict the potential applicability of conical-helix carbon nanofibers to nanoscale thermoelectric devices.

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“…Further studies, following their discovery, led researchers to the understanding that the morphology and quality of helical materials depended upon many factors: catalyst, carbon source, reaction temperature and carrier gas. 53,54,55 Consequently, a wide variety of experimental conditions have been used to synthesise carbon structures with helical morphology. Most notably, it has been shown that the CCVD method is the most efficient method for obtaining helical carbon materials.…”

Section: Synthesis Of Chsmentioning

confidence: 99%

A review of shaped carbon nanomaterials

Coville¹,

Mhlanga²,

Nxumalo³

et al. 2011

S Afr J Sci

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Materials made of carbon that can be synthesised and characterised at the nano level have become a mainstay in the nanotechnology arena. These carbon materials can have a remarkable range of morphologies. They can have structures that are either hollow or filled and can take many shapes, as evidenced by the well-documented families of fullerenes and carbon nanotubes. However, these are but two of the shapes that carbon can form at the nano level. In this review we outline the types of shaped carbons that can be produced by simple synthetic procedures, focusing on spheres, tubes or fibres, and helices. Their mechanisms of formation and uses are also described.

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Synthesis of helical and straight carbon nanofibers by chemical vapor deposition using alkali chloride catalysts

Cited by 12 publications

References 32 publications

Large Scale Synthesis of Carbon Nanofibres on Sodium Chloride Support

Large Scale Synthesis of Carbon Nanofibres on Sodium Chloride Support

Non-equilibrium thermal transport simulation of conical carbon nanofibers

A review of shaped carbon nanomaterials

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