Application of DC plasma torch for synthesis of carbon nanostructured materials

Shavelkina, M. B.; Амиров, Р. Х.; Katarzhis, V. A.; Kiselev, V. I.

doi:10.1088/1742-6596/748/1/012021

Cited by 7 publications

(3 citation statements)

References 3 publications

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“…In the present work, we investigate the peculiarity of synthesis of the few-layered graphene by means of the propane-butane mixture conversion in the helium plasma generated by a DC plasma torch. In contrast to the known methods, the use of a plasma torch makes it possible to obtain a stable plasma jet with high electrical power and high consumption of the gaseous components, and provides for pressure variation ranging from 100 Torr to atmospheric [21,22]. The use of a propane-butane mixture provides high hydrogen content with respect to carbon, and thus, it is not necessary to complicate the synthesis process with the addition of hydrogen, as, for example, in [23].…”

Section: Introductionmentioning

confidence: 99%

Effect of helium/propane–butane atmosphere on the synthesis of graphene in plasma jet system

Shavelkina¹,

Филимонова²,

Амиров³

2020

Plasma Sources Sci. Technol.

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An experimental and theoretical study was performed on helium/propane-butane plasma, which enabled assembly of advanced carbon nanostructures, such as multilayer graphene flakes. A plasma jet was created at pressures ranging from 350 to 710 Torr, and with direct current plasma torch powers from 28 to 35 kW at varying mass ratios of helium to propane-butane 1:7.5 to 1:5. Graphene production was confirmed by different analytical techniques. The non-catalytic synthesis in the plasma jet volume provided the graphene purity. As a result of numerical simulation, the kinetic mechanism of the formation of carbon phase precursors in the gas phase, namely, C 2 dimers, was studied. The concentration of C 2 was determined, depending on the temperature and compared with the literature data on the pressure of saturated carbon vapours at temperatures ranging from 2500 to 5000 K. It is shown that the C 2 H-involving reactions provide additional C 2 production, leading to the formation of supersaturated vapour from C 2 molecules at temperatures of 2500 to 3500 K.

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Section: Introductionmentioning

confidence: 99%

Effect of helium/propane–butane atmosphere on the synthesis of graphene in plasma jet system

Shavelkina¹,

Филимонова²,

Амиров³

2020

Plasma Sources Sci. Technol.

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“…A plasma jet reactor for nanotubes and graphene synthesis is described in detail in previous reports [19,20]. The apparatus structure (figure 1) includes a plasma torch with an expanding channel and vortex stabilization of the plasma jet, a cylindrical stainless steel reactor chamber with a cooled lid and a graphite insertion installed on it, gas supply and pumping systems, a cooling system, and a collector of the synthesis products.…”

Section: Experimental Setup and Methods Of Carbon Materials Analysismentioning

confidence: 99%

Methane/nitrogen plasma-assisted synthesis of graphene and carbon nanotubes

Shavelkina¹,

Филимонова²,

Амиров³

et al. 2018

J. Phys. D: Appl. Phys.

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An experimental and numerical study of plasma-assisted synthesis of graphene and carbon nanotubes is presented. Experiments were carried out using methane/nitrogen plasma generated by a DC plasma torch with pressure variation in the 100–710 Torr range. The synthesis products were studied by synchronous thermal analysis and scanning electron microscopy. The results of these experiments are shown in thermogravimetry graphs and snapshots of the synthesized structure morphology. It is shown that structures in the form of graphene ‘flakes’ are thermally stable. Carbon nanotubes synthesized at different pressures show different morphologies. Using express gravimetric analysis, the maximum nitrogen content in nanostructures was determined to be 8 at.%. Spectral investigation of a jet of nitrogen plasma with the addition of methane and pure nitrogen under atmospheric pressure was performed. The results of the emission spectra analysis agree with the gas phase composition obtained by kinetic modelling. It is shown that the conversion products consist of the following components: H, H2, C2, CN, HCN, C2H2, C4H4, and C6H6, the ratio of which varies with decreasing temperature. Our calculations show that the gas phase composition remains practically unchanged at different pressures.

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“…terial. Even so, not all applications of plasma generators require the cathode to be not destructible, some applications like arc welding and synthesis of materials can benefit from the electrode's material in the plasma stream [15,16].…”

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confidence: 99%

Mechanism of mass expulsion from the surface of a pure tungsten cathode during dc arc initiation

Sargsyan¹,

Терешонок²,

Gadzhiev³

et al. 2020

EPL

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In this work the destruction mechanism of a pure tungsten cathode during the initiation of direct current arc is studied. The experimental work shows that the cathode resides in liquid form during the initiation of the arc, and the process of its destruction happens by ejecting droplets from its surface with the following explosion. The average speed of the ejection and the temperature at the explosion points microseconds before the explosion were registered. A mathematical model is proposed explaining the reason behind the droplets formation.

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Application of DC plasma torch for synthesis of carbon nanostructured materials

Cited by 7 publications

References 3 publications

Effect of helium/propane–butane atmosphere on the synthesis of graphene in plasma jet system

Effect of helium/propane–butane atmosphere on the synthesis of graphene in plasma jet system

Methane/nitrogen plasma-assisted synthesis of graphene and carbon nanotubes

Mechanism of mass expulsion from the surface of a pure tungsten cathode during dc arc initiation

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