Thermocouple and electric probe measurements in a cold atmospheric-pressure microwave plasma jet

Chepelev, Vladimir M.; Chistolinov, A. V.; Khromov, M. A.; Antipov, S. N.; Gadzhiev, M. Kh.

doi:10.1088/1742-6596/1556/1/012091

Cited by 5 publications

(5 citation statements)

References 4 publications

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“…To achieve this, a microwave (MW) plasmatron based on a 2.45-GHz magnetron with a nominal output power of 1.1 kW was used (Figure 1). The design and operating principles of such a plasmatron were discussed in detail in [22,23]. Here, we give only a brief description of it.…”

Section: Methodsmentioning

confidence: 99%

Synthesis ZrON Films with Raman-Enhancement Properties Using Microwave Plasma

Muslimov,

Antipov,

Gadzhiev

et al. 2023

Metals

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The paper investigates the characteristics of the formation and morphology of microstructured zirconium oxynitride (ZrON) films, taking into account structural polymorphism during the impact of atmospheric-pressure microwave nitrogen plasma with the influx of active oxygen from the surrounding atmosphere. Optical, hydrophobic, Raman-active properties of ZrON films have been studied. X-ray diffractometry (XRD), scanning electron microscopy (SEM), ellipsometry method, and Raman spectroscopy, and moisture-resistance properties are used as analytical research methods. It is shown that during the short-term impact of microwave plasma, a morphologically heterogeneous ZrON film can be formed with a set of microhills with a uniform phase composition along the surface. The phase composition of the ZrON surface corresponds to the monoclinic structure of ZrO2. In the volume of the film, a predominantly tetragonal structure of ZrO2 is observed, as well as inclusions of the monoclinic structure of ZrO2. A mechanism for the formation of a ZrON film, taking into account polymorphism and phase transitions, is proposed. The optical properties of ZrON films are determined by both the dielectric phase of ZrO2 and the inclusions of the high-conductivity phase of ZrN. A combination of such factors as the developed microrelief and monoclinic surface structure, as well as nitride phase inclusions, enhance the hydrophobic properties of the ZrON film surface. It is shown that the surface hydrophobicity and resonant effects on ZrN inclusions allow for the enhancement of the Raman spectrum intensity due to the high concentration of analyte molecules in the scanning area.

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Section: Methodsmentioning

confidence: 99%

Synthesis ZrON Films with Raman-Enhancement Properties Using Microwave Plasma

Muslimov,

Antipov,

Gadzhiev

et al. 2023

Metals

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“…We used a waveguide-type microwave plasmatron with an external electrode plasma torch as payload [21][22][23].…”

Section: Microwave Discharge Devicementioning

confidence: 99%

“…These works were aimed at cold plasma jet characterization and treatment effect investigation for biomedical applications; however, they did not investigate the properties of the microwave discharge itself. The development and study of such a wide outlet plasma source were also presented in our recent works [21][22][23].…”

Section: Introductionmentioning

confidence: 97%

“…Over the past two decades, increased attention has been paid to development and investigation of microwave plasma sources for atmospheric-pressure cold plasma jet generation [18][19][20][21][22][23]. Currently, the most widely investigated cold plasma jet is so-called 'plasma plume' which based on a pin-electrode discharge inside a narrow dielectric tube [17,[24][25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

“…In the present work, we used a discharge gap of sphere-to-plane geometry to obtain and study an interelectrode microwave discharge in Ar flow, representing a new type of glow discharge at atmospheric pressure. The discharge was excited in the wide-outlet plasma torch developed for large-area surface-treatment applications [21]. The results are presented from high-speed video observations that reveal the filamentary structure of the microwave glow discharge channel.…”

Section: Introductionmentioning

confidence: 99%

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Interelectrode microwave glow discharge in atmospheric-pressure argon flow

Antipov¹,

Gadzhiev²,

Sargsyan³

et al. 2023

Phys. Scr.

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The spatio-temporal structure and plasma parameters of a new type of glow discharge – atmospheric-pressure interelectrode microwave discharge in gas flow – were studied experimentally and numerically. A multi-electrode coaxial-type cold plasma torch developed for large-area surface treatment was used as a gas discharge device. The torch was supplied with microwave power (2.45 GHz, ∼100 W) via a coaxial cable by a typical wave-guide plasmatron. Self-sustained glow discharges were excited between the round ends of the rod-like electrodes and inner wall of the cylindrical discharge chamber near the outlet. The filamentation of the discharge channel in the near-electrode regions was detected by high-speed video filming. The dendritic self-similar (fractal) character of the filaments’ structure was revealed and analyzed. The branching factor and fractal dimension of this structure were estimated as 3 and 1.1–1.3, respectively. Using discharge gas temperature T_g = 1200±100 K, as determined from the emission spectroscopy measurements, the following discharge plasma parameters were obtained from numerical calculations: electron temperature T_e = 1.14 eV and concentration n_e∼10^21-10^22 m^(-3), conductivity σ ∼ 400 Ω^(-1)m^(-1) , current density j ∼ 10^6 A/m^2, and electric field strength E ∼ 10^4 V/m.

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Emission spectrum analysis of an atmospheric electrode microwave discharge in argon flow and of a cold plasma jet on its base

Antipov

Sargsyan

Gadzhiev

2020

J. Phys.: Conf. Ser.

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The measurements and analysis of the emission spectra both of atmospheric-pressure electrode microwave discharge in argon flow and cold plasma jet induced by the discharge are conducted. We used experimental setup based on the previously developed multipurpose 2.45-Hz-plasmatron with the external portable discharge chamber (plasma torch) with the outlet of 2.5 cm in diameter and power of about several hundred watts. Discharge chamber has 6 rod-like electrodes which form a regular hexagon in a cross section of the torch. Discharge channels are formed between the ends of the electrodes and the inner wall of the chamber. Molecular bands of NO, OH, N2, NH and atomic lines of Ar were found in the spectrum of the discharge channels. Based on the analysis of the spectra, it was shown that the gas temperature in the discharge channel was about 1200 K. In the cold plasma jet spectrum, due to its weak luminescence, only the molecular lines OH and N2 were reliably observed.

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Thermocouple and electric probe measurements in a cold atmospheric-pressure microwave plasma jet

Cited by 5 publications

References 4 publications

Synthesis ZrON Films with Raman-Enhancement Properties Using Microwave Plasma

Synthesis ZrON Films with Raman-Enhancement Properties Using Microwave Plasma

Interelectrode microwave glow discharge in atmospheric-pressure argon flow

Emission spectrum analysis of an atmospheric electrode microwave discharge in argon flow and of a cold plasma jet on its base

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