Controllable and large-scale synthesis of metal-free carbon nanofibers and carbon nanocoils over water-soluble Na K  catalysts

Qi, Xiaosi; Wang, Zhong; Yao, Xiujuan; Zhang, H.; Ding, Qian; Wu, Qiong; Au, Chak Tong; Du, Youwei

doi:10.1016/j.carbon.2011.08.076

Cited by 23 publications

(21 citation statements)

References 49 publications

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“…It was shown that the size, shape, and yield of the grown nanostructures are governed by the chemical and geometrical features of the catalyst [8][9][10]. To date, assorted types of catalysts have been investigated for the formation of CNCs, which mainly include Cu [7,8], Fe/Sn [11,12], Fe/In [12,13], TiC [14] and alkali compounds [4,15]. Based on these studies, several growth models have been proposed in the literature; the prevailing mechanism is based on the anisotropic extrusion of carbon from different facets/sites of catalyst particles, which is attributed to catalyst topography [7,8,16] as well as inhomogeneity of chemical composition within a particle [14,17].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of carbon nanocoil forests on BaSrTiO3 substrates with the aid of a Sn catalyst

Sun

Koós

Dillon

et al. 2013

Carbon

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A B S T R A C TA simple route for the Sn-assisted synthesis of carbon nanocoils (CNCs) by chemical vapor deposition of acetylene on polycrystalline BaSrTiO 3 (BST) substrates is reported. In this study, high-quality CNC forests have been synthesized on BST substrates with the presence of Sn. The morphologies and qualities of the CNCs were characterized by scanning electron microscopy, transmission electron microscopy, and Raman spectroscopy, while the structures and compositions of catalysts were investigated by transmission electron microscopy and energy-dispersive X-ray spectroscopy. Structural control over the CNCs was achieved by simply altering the Sn concentration or acetylene flow rates. This study demonstrates that Sn can act as an efficient catalyst for CNC synthesis in conjunction with either perovskite oxides (BST) or transition metals (Fe).

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Section: Introductionmentioning

confidence: 99%

Synthesis of carbon nanocoil forests on BaSrTiO3 substrates with the aid of a Sn catalyst

Sun

Koós

Dillon

et al. 2013

Carbon

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“…It is well known that the catalyst composition plays a critical role in determining CNC morphology [19,20,22,23].…”

Section: Resultsmentioning

confidence: 99%

“…In general, the synthesis of CNCs is achieved via catalytic chemical vapour deposition (CCVD) processes, which use alloys or metal oxides as catalysts and gaseous hydrocarbons as the carbon source. Control of CNC morphology has been attempted by manipulating synthesis conditions, such as catalyst composition, reaction temperature, hydrocarbon flow rate, and feed gas composition [19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Nitrogen-Doped Carbon Nanocoils with Adjustable Morphology Using Ni—Fe Layered Double Hydroxides as Catalyst Precursors

Iwasaki

Tomisawa

Yoshimura

et al. 2015

Nanomaterials and Nanotechnology

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Nitrogen-doped carbon nanocoils (CNCs) with adjusted morphologies were synthesized in a one-step catalytic chemical vapour deposition (CVD) process using acetonitrile as the carbon and nitrogen source. The nickel iron oxide/nickel oxide nanocomposites, which were derived from nickel-iron layered double hydroxide (LDH) precursors, were employed as catalysts for the synthesis of CNCs. In this method, precursor-to-catalyst transformation, catalyst activation, formation of CNCs, and nitrogen doping were all performed in situ in a single process. The morphology (coil diameter, coil pitch, and fibre diameter) and nitrogen content of the synthesized CNCs was individually adjusted by modulation of the catalyst composition and CVD reaction temperature, respectively. The adjustable ranges of the coil diameter, coil pitch, fibre diameter, and nitrogen content were confirmed to be approximately 500±100 nm, 600±100 nm, 100±20 nm, and 1.1±0.3 atom%, respectively.

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“…Enlightened by the idea of metal-catalyst-free growth and based on the knowhow acquired in our previous works [30][31][32], we investigated in the past year the use of commercial water-soluble salts as catalysts for the synthesis of CNMs [33]. Because the catalyst is water-soluble, it can be removed from CNMs through simple steps of water washing, and high-purity CNMs can be obtained easily without being damaged.…”

Section: Introductionmentioning

confidence: 99%

Controllable and large-scale synthesis of metal-free carbon nanofibers and carbon nanocoils over water-soluble Na K catalysts

Cited by 23 publications

References 49 publications

Synthesis of carbon nanocoil forests on BaSrTiO3 substrates with the aid of a Sn catalyst

Synthesis of carbon nanocoil forests on BaSrTiO3 substrates with the aid of a Sn catalyst

Synthesis of Nitrogen-Doped Carbon Nanocoils with Adjustable Morphology Using Ni—Fe Layered Double Hydroxides as Catalyst Precursors

Selective synthesis of carbon nanomaterials of different structures over KNO3 catalyst

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