Suppression of self-pulsing regime of direct current driven microplasma discharges

Mahamud, Rajib; Farouk, Tanvir

doi:10.1063/1.4950730

Cited by 5 publications

(2 citation statements)

References 15 publications

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“…However, unlike the traditional stable glow discharge, this specific discharge operated in the “sub-normal” discharge. A “sub-normal” glow discharge temporally fluctuated between a corona and normal glow continuously [ 15 , 29 ] and possessed the characteristics of both a corona and normal glow discharge. It had a very low current and therefore minimized the thermal effect but at the same time has higher electric field due to the sharp temporal and spatial variations.…”

Section: Methodsmentioning

confidence: 99%

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Fabrication and Characterization of Non-Equilibrium Plasma-Treated PVDF Nanofiber Membrane-Based Sensors

Sultana

Khan

Mahamud

et al. 2021

Sensors

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The effect of a self-pulsing non-equilibrium plasma discharge on piezoelectric PVDF nanofiber membrane was investigated. The plasma discharge was generated in air with a DC power source, with a discharge current of 0.012 mA, a nominal interelectrode separation of 1 mm, and discharge voltage of ~970 V. In a continuous fabrication process, the electrospinning method was used to generate thin nanofiber membrane with a flow rate of 0.7–1 mL h−1 and 25–27 kV voltage to obtain the nanofiber with high sensitivity and a higher degree of alignment and uniformity over a larger area. Plasma treatment was applied on both single layer and multi-layer (three layers) nanomembranes. In addition, simultaneously, the nanofiber membranes were heat-treated at a glass transition temperature (80–120 °C) and then underwent plasma treatment. Fourier-transform infrared (FTIR) spectroscopy showed that the area under the curve at 840 and 1272 cm−1 (β phase) increased due to the application of plasma and differential scanning calorimeter (DSC) indicated an increase in the degree of crystallinity. Finally, PVDF sensors were fabricated from the nanofibers and their piezoelectric properties were characterized. The results suggested that compared to the pristine samples the piezoelectric properties in the plasma and plasma-heat-treated sensors were enhanced by 70% and 85% respectively.

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Section: Methodsmentioning

confidence: 99%

“…Non-equilibrium, atmospheric pressure plasmas have gained significant interest for the activation and functionalization of a wide range of materials [ 11 , 12 , 13 , 14 , 15 , 16 ]. Plasma-treated polymers in air or oxygen media exhibits higher surface energy.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Characterization of Non-Equilibrium Plasma-Treated PVDF Nanofiber Membrane-Based Sensors

Sultana

Khan

Mahamud

et al. 2021

Sensors

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Experimental study on self-pulsing in flow-induced atmospheric pressure plasma jet

Cui

Miao

et al. 2017

Physics of Plasmas

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In this paper, we present an experimental study on the self-pulsing phenomenon in a flow-induced atmospheric pressure plasma jet (APPJ) in a hollow electrode configuration driven by dc voltage supply. The current-voltage curve, the typical waveforms of current and voltage of self-pulsing, the time-resolved images, and the repetition frequency were measured under different experimental conditions. The results show that the APPJ of a hollow electrode can sustain in a stable, repeatable self-pulsing regime. The waveform of the pulsed current is very stable with nearly constant rising time and decay time at different discharge averaged currents. Although the pulsing frequency increases linearly with the averaged current and the gas flow rate, it decreases with the electrode gap. An equivalent electric circuit consisting of a capacitor and two resistors was used to model the self-pulsing discharge plasma. The simulation results and the time-resolved images recorded using an ICCD camera show that the pulsed process of the hollow electrode APPJ contains the evolutions of gas breakdown, discharge development, and decay of a glow plasma. A weak discharge is maintained during the time interval between two pulses, indicating that the self-pulsing in this APPJ is a mode transition between glow and weak discharge.

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Experiment and simulation of the characteristics and mechanisms of self-oscillations in parallel-plate glow discharges

Zhao

et al. 2020

Journal of Applied Physics

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This paper presents experimental results of the characteristics appearance and the mechanism of self-oscillation in a parallel-plate glow discharge with argon as the discharge gas at 266 Pa. The cathode and anode are molybdenum plates with a diameter of 3 cm. The distance between the electrodes is 1 cm. Discharge average voltage and current vary between 300 V and 500 μA, respectively. Light emission from the electrode gap is measured by a charge coupled device camera and argon spectra are recorded of emission lines at 650–800 nm. Results show that self-oscillations exist in the negative differential resistance region in the static V–I curve. An obvious negative differential resistance also can be observed in the dynamic of the V–I curve for the self-oscillations. The appearance and disappearance of the self-oscillating phenomenon are companied with an obvious change in all of the discharge current, discharge images, and electron excited temperature. It can be determined that the self-oscillation is a mode transition between low-current stage of Townsend discharge and high-current stage of glow discharge. The frequency range of self-oscillations starts with 0.4 k Hz up to 24 k Hz in dependence of the average discharge current and the external capacitors. When the self-oscillation disappears, the luminescence shows a significant radial contraction, the electron excitation temperature rise obviously. The frequency of oscillations exhibits a substantial linear increase with the average discharge current and decreases with the increase in the external capacitance from 0 pF up to 250 pF. A resistance–capacitance circuit model is used to simulate the self-oscillation discharge in this experimental glow discharge. Results show that the waveforms simulated by this circuit model are well consistent with those obtained experimentally at different average discharge currents and external parallel capacitances. The equivalent plasma resistance decreases with an increase in the average discharge current. The theory of charge and discharge of a capacitor provides good insights into the characteristics and mechanism of self-oscillations in parallel-plate discharges.

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Suppression of self-pulsing regime of direct current driven microplasma discharges

Cited by 5 publications

References 15 publications

Fabrication and Characterization of Non-Equilibrium Plasma-Treated PVDF Nanofiber Membrane-Based Sensors

Fabrication and Characterization of Non-Equilibrium Plasma-Treated PVDF Nanofiber Membrane-Based Sensors

Experimental study on self-pulsing in flow-induced atmospheric pressure plasma jet

Experiment and simulation of the characteristics and mechanisms of self-oscillations in parallel-plate glow discharges

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