Synthesis and characterization of carbon-poor SiC nanowires via vapor-liquid-solid growth mechanism

Guo, Christine; Cheng, Laifei; Ye, Fang; Li, Zhaochen; Xu, Zeshui

doi:10.1016/j.ceramint.2018.12.131

Cited by 21 publications

(3 citation statements)

References 24 publications

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“…Zhang et al manufactured SiC NWs by chemical vapor deposition, the method was limited by complex equipment and uncontrollable nanowire morphology 16 . Cheng et al used single‐crystal Si (100) wafer as the substrate and Ni as a catalyst for the growth of nanowires via pyrolysis of polycarbosilane (PCS), the method was limited by expensive raw material and it is very difficult to remove the residual metal catalyst 17 . In order to solve the above issues, essential efforts are still needed to make the entire preparation work more economically feasible and green.…”

Section: Introductionmentioning

confidence: 99%

Photoluminescence property of inexpensive flexible SiC nanowires membrane by electrospinning and carbothermal reduction

Wei

Wang

et al. 2020

J Am Ceram Soc

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Silicon carbide nanowire (SiC NW), as a typical wide band gap semiconductor was used as light‐emitting materials and devices in high‐temperature and harsh environments due to its excellent properties. In this paper, flexible ultra‐long SiC NWs membrane was successfully synthesized by electrospinning and subsequently high‐temperature sintering using phenolic resin and silica sol as precursors. Results of system characterization reveal that SiC NWs possess a smooth and uniform surface with diameter distribution mainly between 50‐300 nm and a length of more than tens of micrometers, forming a network structure. The growth mechanism of synthesized nanowires was mainly carbothermal reduction in situ and was accompanied by vapor‐solid (V‐S) reaction. The present work provides a simple and cost‐effective way for controllable fabrication of SiC NWs membrane. The photoluminescence spectrum of SiC NWs membrane emerged a clear blue shift, indicating a potential application in optoelectronic devices and discussed the potential applications of SiC NWs membrane in other fields.

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Section: Introductionmentioning

confidence: 99%

Photoluminescence property of inexpensive flexible SiC nanowires membrane by electrospinning and carbothermal reduction

Wei

Wang

et al. 2020

J Am Ceram Soc

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“…Because the amount of Y2O3 is very low, there should be very small liquid drops formed in the substrate at the synthetization temperature. This indicates a typical mechanism of VLS growth, which is normally used for the growth of nanowires and nanowhiskers [21]. In this process, the vapored species condenses preferentially into the catalytic liquid drops and deposits serially from the supersaturated liquid drops.…”

Section: Resultsmentioning

confidence: 89%

Synthesis of Multiwall Boron Nitride (BN) Nanotubes by a PVD Method Based on Vapor–Liquid–Solid Growth

Guo

Chen

et al. 2020

Materials

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Multiwall boron nitride (BN) nanotubes were synthesized by a novel physical vapor deposition (PVD) method, in which the BN nanotubes grow on a compact substrate composed of AlN, γ-Al2O3, Y2O3, and carbon powders. The obtained BN nanotubes assemble in an orderly manner with a typical length of over one millimeter and a diameter of one-hundred nanometers. The hollow multiwall tubes have a spherical tip, which is presumed to be a liquid drop at the synthesis temperature, indicating the vapor–liquid–solid (VLS) growth mechanism.

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“…The slope of the line for Reaction (2) was negative in Figure 1 , so increasing the temperature was helpful in forming ZrB 2 . Meanwhile, β -SiC content changed little, indicating that formation process of β -SiC through Reaction (3) had completed at a temperature lower than 1573 K, which was 150 K lower than that of Zhang [ 17 ] via molten-salt-assisted carbothermal reduction with silica fume and phenolic resin as raw materials and close to that of Guo [ 21 ] via nickel-catalyzed carbothermal reduction of polycarbosilane (PCS). The relative contents of ZrB 2 and β -SiC showed no obvious changes when further raising the temperature to 1773 K. The weight ratio of ZrB 2 to β -SiC was 72:28 ( Figure 2 b), which was close to the theoretical value of 74:26 calculated based on Reaction (1), suggesting that phase-pure ZrB 2 -SiC composite powders were synthesized at 1723 K. This temperature was 50 K lower than that in the traditional carbothermal reduction of zircon [ 9 ].…”

Section: Resultsmentioning

confidence: 99%

In Situ Growth Behavior of SiC Whiskers with High Aspect Ratio in the Synthesis of ZrB2-SiC Composite Powders

et al. 2020

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Aiming to provide key materials in order to improve the fracture toughness of ZrB2 ceramics, ZrB2-SiC composite powders with in situ grown SiC whiskers were successfully synthesized via a simple molten-salt-assisted ferrous-catalyzed carbothermal reduction method. Thermodynamic calculations on the ZrO2-SiO2-B2O3-C-Fe system were carried out. The effects of heating temperature and ferrous catalyst amount on the growth behavior of SiC whiskers in ZrB2-SiC composite powders were investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray energy dispersive spectroscopy (EDS), and transmission electron microscopy (TEM). The results showed that the aspect ratio of SiC whiskers and the relative content of ZrB2 particles increased with increasing heating temperature (1523–1723 K) and a molar ratio of Fe to ZrSiO4 from 0:1 to 0.2:1. Phase-pure ZrB2-SiC composite powders were obtained at 1723 K when the molar ratio of raw materials was 0.2:0.5:1:1.5:8.4 (Fe:NaCl:ZrSiO4:B2O3:C). Single crystalline β-SiC whiskers with a mean diameter of 0.15 μm and an aspect ratio of 70–120 were homogeneously distributed in the final composite powders. A molten-salt-assisted iron-catalyzed vapor–solid mechanism was promoted for the growth mechanism of in situ grown SiC whiskers.

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Synthesis and characterization of carbon-poor SiC nanowires via vapor-liquid-solid growth mechanism

Cited by 21 publications

References 24 publications

Photoluminescence property of inexpensive flexible SiC nanowires membrane by electrospinning and carbothermal reduction

Photoluminescence property of inexpensive flexible SiC nanowires membrane by electrospinning and carbothermal reduction

Synthesis of Multiwall Boron Nitride (BN) Nanotubes by a PVD Method Based on Vapor–Liquid–Solid Growth

In Situ Growth Behavior of SiC Whiskers with High Aspect Ratio in the Synthesis of ZrB2-SiC Composite Powders

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