Synthesis and characterization of well-aligned carbon nitrogen nanotubes by microwave plasma chemical vapor deposition

Ma, Xucun; Xu, Guichang; Wang, Enge

doi:10.1007/bf02917139

Cited by 3 publications

(1 citation statement)

References 12 publications

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“…The morphologies of the tubes observed by TEM clearly indicated a BCNT structure formed because of the presence of NH3 in the pyrolysis gases stream, since this compound favors this kind of nanotubes [61][62][63][64][65][66][67][68][69][70][71][72]. Nitrogen inclusion contributes to the reduction of tube diameters because it promotes the formation of pentagons into sp 2 net, due to its delivery of higher energy stability [73] or due to the increase of surface defects which causes twist layers and close it [74,75].…”

Section: Bcnts Characterizationmentioning

confidence: 97%

Production of bamboo-type carbon nanotubes doped with nitrogen from polyamide pyrolysis gas

Arnaiz

Martı́n-Gullón

Font

et al. 2018

Journal of Analytical and Applied Pyrolysis

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 The viability of the bamboo-type carbon nanotubes production from pyrolysis gas by a simple process of catalytic chemical vapor deposition is demonstrated.  The pyrolyzed polymer polyamide 6.6 provided the necessary carbon, nitrogen and hydrogen.  Good quality nanotubes were obtained with 5 to 20 layers and 20 nm in diameter.  The best results were obtained from pyrolysis at 900 ºC and growth at 750 ºC.

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Section: Bcnts Characterizationmentioning

confidence: 97%

Production of bamboo-type carbon nanotubes doped with nitrogen from polyamide pyrolysis gas

Arnaiz

Martı́n-Gullón

Font

et al. 2018

Journal of Analytical and Applied Pyrolysis

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Growth of carbon nanotube arrays using the existing array as a substrate and their Raman characterization

Sun

Liu

et al. 2001

Chemical Physics Letters

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En route to controlled catalytic CVD synthesis of densely packed and vertically aligned nitrogen-doped carbon nanotube arrays

Boncel¹,

Pattinson²,

Geiser³

et al. 2014

Beilstein J. Nanotechnol.

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SummaryThe catalytic chemical vapour deposition (c-CVD) technique was applied in the synthesis of vertically aligned arrays of nitrogen-doped carbon nanotubes (N-CNTs). A mixture of toluene (main carbon source), pyrazine (1,4-diazine, nitrogen source) and ferrocene (catalyst precursor) was used as the injection feedstock. To optimize conditions for growing the most dense and aligned N-CNT arrays, we investigated the influence of key parameters, i.e., growth temperature (660, 760 and 860 °C), composition of the feedstock and time of growth, on morphology and properties of N-CNTs. The presence of nitrogen species in the hot zone of the quartz reactor decreased the growth rate of N-CNTs down to about one twentieth compared to the growth rate of multi-wall CNTs (MWCNTs). As revealed by electron microscopy studies (SEM, TEM), the individual N-CNTs (half as thick as MWCNTs) grown under the optimal conditions were characterized by a superior straightness of the outer walls, which translated into a high alignment of dense nanotube arrays, i.e., 5 × 108 nanotubes per mm2 (100 times more than for MWCNTs grown in the absence of nitrogen precursor). In turn, the internal crystallographic order of the N-CNTs was found to be of a ‘bamboo’-like or ‘membrane’-like (multi-compartmental structure) morphology. The nitrogen content in the nanotube products, which ranged from 0.0 to 3.0 wt %, was controlled through the concentration of pyrazine in the feedstock. Moreover, as revealed by Raman/FT-IR spectroscopy, the incorporation of nitrogen atoms into the nanotube walls was found to be proportional to the number of deviations from the sp2-hybridisation of graphene C-atoms. As studied by XRD, the temperature and the [pyrazine]/[ferrocene] ratio in the feedstock affected the composition of the catalyst particles, and hence changed the growth mechanism of individual N-CNTs into a ‘mixed base-and-tip’ (primarily of the base-type) type as compared to the purely ‘base’-type for undoped MWCNTs.

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Synthesis and characterization of well-aligned carbon nitrogen nanotubes by microwave plasma chemical vapor deposition

Cited by 3 publications

References 12 publications

Production of bamboo-type carbon nanotubes doped with nitrogen from polyamide pyrolysis gas

Production of bamboo-type carbon nanotubes doped with nitrogen from polyamide pyrolysis gas

Growth of carbon nanotube arrays using the existing array as a substrate and their Raman characterization

En route to controlled catalytic CVD synthesis of densely packed and vertically aligned nitrogen-doped carbon nanotube arrays

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