Kinetics and concentration of active particles in nonequilibrium low temperature methane plasma

An experimental and theoretical study on microwave (2.45 GHz) plasma enabled assembly of carbon nanostructures, such as multilayer graphene sheets and nanoparticles, was performed. The carbon nanostructures were fabricated at different Ar-CH4 gas mixture composition and flows at atmospheric pressure conditions. The synthesis method is based on decomposition of the carbon-containing precursor (CH4) in the "hot" microwave plasma environment into carbon atoms and molecules, which are further converted into solid carbon nuclei in the "colder" plasma zones. By tailoring of the plasma environment, a controlled synthesis of graphene sheets and diamond-like nanoparticles was achieved. Selective synthesis of graphene flakes was achieved at a microwave power of 1 kW, Ar and methane flow rates of 600 sccm and 2 sccm respectively, while the predominant synthesis of diamond-like nanoparticles was obtained at the same power, but with higher flow rates, i.e. 1000 and 7.5 sccm, respectively. Optical emission spectroscopy was applied to detect the plasma emission related to carbon species from the 'hot' plasma zone and to determine the main plasma parameters. Raman spectroscopy and scanning electron microscopy have been applied to characterize the synthesized nanostructures. A previously developed theoretical model was further updated and employed to understand the mechanism of CH4 decomposition and formation of the main building units, i.e. C and C2, of the carbon nanostructures. An insight into the physical chemistry of carbon nanostructure formation in a high energy density microwave plasma environment is presented.

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Microwave plasma enabled synthesis of free standing carbon nanostructures at atmospheric pressure conditions

Bundaleska

Цыганов

Dias

et al. 2018

Phys. Chem. Chem. Phys.

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Influence of the initial composition of a methane-argon mixture on the electricophysical parameters and plasma composition of DC glow discharge

2015

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Excitation kinetics of electronic states of hydrogen molecules in nonequilibrium discharges: Electronic ground state

Shakhatov

Lebedev

Lacoste³

et al. 2015

High Temp

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International audienceThis review offers an analysis of the vibrational kinetics of hydrogen molecules in the singlet ground state X 1∑ g + for various gas discharges. The measured quasi-stationary vibrational-level distribution functions of a hydrogen molecule in the electronic ground state at the corresponding vibrational temperatures of the first level and those calculated in the framework of a semiempirical level collisional–radiative model of low-temperature plasma in hydrogen, developed in this study, are compared. A database of the measured and calculated characteristics of kinetic processes involving vibrational-excited hydrogen molecules, as well as macro and microparameters of hydrogen low-temperature plasma, is created

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Kinetics and concentration of active particles in nonequilibrium low temperature methane plasma

Cited by 7 publications

References 19 publications

Microwave plasma enabled synthesis of free standing carbon nanostructures at atmospheric pressure conditions

Microwave plasma enabled synthesis of free standing carbon nanostructures at atmospheric pressure conditions

Influence of the initial composition of a methane-argon mixture on the electricophysical parameters and plasma composition of DC glow discharge

Excitation kinetics of electronic states of hydrogen molecules in nonequilibrium discharges: Electronic ground state

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