Continuous preparation and formation mechanism of few-layer graphene by gliding arc plasma

Zhong, Ruipeng; Hong, Ruoyu

doi:10.1016/j.cej.2020.124102

Cited by 38 publications

(21 citation statements)

References 47 publications

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“…It can be assumed that hydrogen from C3H remains in the C-C structure and influences the shape of In Figures 19 and 20, evolution of the molar composition of the argon plasma is presented in detail, in two ranges of concentration. Results of calculations are in agreement with the references [40][41][42]. Evidently the critical temperature of the beginning of condensation in this case is 3300 K. The formation of condensed carbon goes on at the expense of C, C 2 , C 3 , C 5 , C 2 H, C 2 H 2 , C 4 H 2 , and C 3 H. It can be assumed that hydrogen from C 3 H remains in the C-C structure and influences the shape of the future graphene structure.…”

Section: Resultssupporting

confidence: 88%

Distinctive Features of Graphene Synthesized in a Plasma Jet Created by a DC Plasma Torch

Shavelkina¹,

Иванов²,

Bocharov³

et al. 2020

Materials

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Synthesis of graphene materials in a plasma stream from an up to 40 kW direct current (DC) plasma torch is investigated. These materials are created by means of the conversion of hydrocarbons under the pressure 350–710 Torr without using catalysts, without additional processes of inter-substrate transfer and the elimination of impurities. Helium and argon are used as plasma-forming gas, propane, butane, methane, and acetylene are used as carbon precursors. Electron microscopy and Raman imaging show that synthesis products represent an assembly of flakes varying in the thickness and the level of deformity. An occurrence of hydrogen in the graphene flakes is discovered by X-ray photoelectron spectroscopy, thermal analysis, and express-gravimetry. Its quantity depends on the type of carrier gas. Quasi-one-dimensional approach under the local thermodynamic equilibrium was used to investigate the evolution of the composition of helium and argon plasma jets with hydrocarbon addition. Hydrogen atoms appear in the hydrogen-rich argon jet under higher temperature. This shows that solid particles live longer in the hydrogen-rich environment compared with the helium case providing some enlargement of graphene with less hydrogen in its structure. In conclusion, graphene in flakes appears because of the volumetric synthesis in the hydrogen environment. The most promising directions of the practical use of graphеne flakes are apparently related to structural ceramics.

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Section: Resultssupporting

confidence: 88%

Distinctive Features of Graphene Synthesized in a Plasma Jet Created by a DC Plasma Torch

Shavelkina¹,

Иванов²,

Bocharov³

et al. 2020

Materials

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“…The changed solution color probably indicated that the carbon solid materials were formed from the glycine degradation reaction while applying the highvoltage discharge plasma. Even though the reason why the carbon solid materials were only generated under high-pressure conditions is not clear yet, as described above, when the high-voltage discharge plasma was applied in the gas-liquid water environment, the It is known that carbon materials can be synthesized by applying a high-voltage discharge plasma in a liquid medium [88][89][90][91][92][93][94][95]. It is a simple technique, where, as a first approach, carbon materials can be originated from electrode erosion with graphite as electrodes.…”

Section: Resultsmentioning

confidence: 99%

Pulsed Discharge Plasma in High-Pressure Environment for Water Pollutant Degradation and Nanoparticle Synthesis

Diono

Machmudah

Kanda

et al. 2021

Plasma

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The application of high-voltage discharge plasma for water pollutant decomposition and the synthesis of nanoparticles under a high-pressure argon gas environment (~4 MPa) was demonstrated. The experiments were carried out in a batch-type system at room temperature with a pulsed DC power supply (15.4 to 18.6 kV) as a discharge plasma source. The results showed that the electrode materials, the pulsed repetition rates, the applied number of pulses, and the applied voltages had a significant effect on the degradation reactions of organic compounds. Furthermore, carbon solid materials from glycine decomposition were generated during the high-voltage discharge plasma treatment under high-pressure conditions, while Raman spectra and the HRTEM images indicated that titanium dioxide with a brookite structure and titanium carbide nanoparticles were also formed under these conditions. It was concluded that this process is applicable in practice and may lead to advanced organic compound decomposition and metal-based nanoparticle synthesis technologies.

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“…According to previous research, carbon black can be obtained by plasma pyrolysis of methane [31], while graphene can be further prepared by adding an appropriate ratio of hydrogen [32].. As for the effect of hydrogen, our research group has carried out in-depth research [32], through simulation, it was found that the addition of hydrogen can generate a large number of hydrogen atoms, which can form C-H bonds with carbon atoms on the edge of the carbon cluster, resulting in the decrease of carbon dangling bonds, and delaying the formation of spherical particles in the carbon cluster. Related studies have reported that the formed hydrogen atoms can react with the carbon cluster and form bonds, terminating the carbon-centered free radical to form sheet-like carbon materials [33].…”

Section: Effect Of Hydrogen On Silicon-carbon Nanocompositementioning

confidence: 99%

Magnetoelectric Plasma Preparation of Silicon-Carbon Nanocomposite as Anode Material for Lithium Ion Batteries

et al. 2020

Self Cite

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A high-performance silicon-carbon nanocomposite facilely prepared by one-step magnetoelectric plasma pyrolysis of the mixture of methane, silane, and hydrogen is proposed for lithium-ion batteries. The ratio of silane, methane, and hydrogen was studied to optimize the properties of the composite. When the ratio of hydrogen/silane/methane is 1:1:3, the composite is composed of spherical Si nanoparticles that uniformly attach to the surface of the tremelliform carbon nanosheets framework, in which the tremelliform carbon nanosheets can effectively resist the volumetric change of the Si nanoparticles during the cycles and serve as electronic channels. The silicon-carbon nanocomposite exhibits a high reversible capacity (1007 mAh g−1 after 50 cycles), a low charge transfer resistance, and an excellent rate performance. In addition, the proposed process for synthesizing silicon-carbon nanocomposite without expensive materials or toxic reagents is an environmentally friendly and cost-effective method for mass production.

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Continuous preparation and formation mechanism of few-layer graphene by gliding arc plasma

Cited by 38 publications

References 47 publications

Distinctive Features of Graphene Synthesized in a Plasma Jet Created by a DC Plasma Torch

Distinctive Features of Graphene Synthesized in a Plasma Jet Created by a DC Plasma Torch

Pulsed Discharge Plasma in High-Pressure Environment for Water Pollutant Degradation and Nanoparticle Synthesis

Magnetoelectric Plasma Preparation of Silicon-Carbon Nanocomposite as Anode Material for Lithium Ion Batteries

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