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Silver nanoparticle-loaded filter paper: Innovative assembly method by nonthermal plasma and facile application for the reduction of methylene blue
摘要： In this study, silver nanoparticles (AgNPs) were loaded onto commercial filter paper using a simple “suspending-discharging-washing” process. Nanosecond pulse dielectric barrier discharge (NP-DBD) plasma was used to perform the in-situ reduction-loading process in a plate-to-plate DBD reactor during the five-minute fabrication process. Gaseous ethanol was used as the reducing agent under an argon gas plasma treatment. There was no thermal treatment, which prefers the formation of small nanoparticles. Transmission electron microscopy showed that the synthesized AgNPs were well-dispersed over the surface of the filter paper. The synthesized nanoparticles were hemispherical and crystalline. Fourier transform infrared spectroscopy showed that the cellulose skeletons had been mostly maintained after the plasma discharge. The catalytic activity of the AgNPs paper was evaluated by the reduction reaction of methylene blue (MB) with sodium borohydride (NaBH4) using a straightforward filtration process.
关键词： silver nanoparticles,dielectric barrier discharge,nanoparticles synthesis,nonthermal plasma
更新于2025-11-14 15:14:40
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[IEEE 2018 31st International Vacuum Nanoelectronics Conference (IVNC) - Kyoto, Japan (2018.7.9-2018.7.13)] 2018 31st International Vacuum Nanoelectronics Conference (IVNC) - Field emission assisted micro plasma discharges at vacuum and atmospheric pressures
摘要： Spatially confined non-equilibrium plasmas at vacuum and atmospheric pressure in the dimensions from a few microns to one millimeter are a promising approach to the generation and maintenance of stable glow discharges. The realization of these micro-discharges or micro-plasmas enable more accurate investigations in the field of micro plasma research. We report on field emission assisted micro plasmas excited by an alternating current with frequencies up to 1 kHz. Due to the field enhancement caused by an array of Si nano-tip structures the ignition voltage of stable plasma discharges can be reduced by 30%.
关键词： low-temperature plasma,field emission array,dielectric barrier discharge,plasma discharge
更新于2025-09-23 15:21:21
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Experiment and simulation calculation of micro-cavity dielectric barrier discharge
摘要： In order to study the discharge mechanism and discharge parameters evolution of micro-cavity dielectric barrier discharge(MDBD), an experimental platform based on the dielectric panel surface grid micro-structure electrode device was built. Discharge equivalent circuit of the MDBD was established based on the deep analysis of the discharge physical process and experimental results. Then, using Matlab/Simulink and BOLSIG+ software， we solved the Kirchhoff’s voltage equation, Boltzmann equation and the electronic continuity equation to obtain the variation of the discharge characteristic parameters, including air gap voltage, the dielectric surface voltage, the electron density and the electron temperature. The results show that the gas gap voltage and dielectric surface voltage are decreased slightly during discharge, the electron temperature and electron density are consistent with the variation of discharge current. The maximum electron temperature is about 3.0eV, the average value is about 1.6eV, and its value is lower than the conventional dielectric barrier discharge(DBD).
关键词： Micro-cavity,Electron Temperature,Dielectric Barrier Discharge,Gas Gap Voltage,Electron Density
更新于2025-09-23 15:21:21
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Effects of material degradation on electrical and optical characteristics of surface dielectric barrier discharge
摘要： In this paper, screen-printed electrodes are asymmetrically fabricated on three different dielectrics (multi-layered polyimide, quartz, and alumina). Supplied with AC power, sustainable surface dielectric barrier discharge (SDBD) plasma is generated in atmospheric pressure. During plasma processing, different changes of material degradation and discharge images are observed. The corresponding electrical and optical characteristics are investigated by optical emission spectra (OES) and Lissajous figure analysis, respectively. It is found that both dielectric degradation and electrode erosion occur on the surface of the polyimide based SDBD device, while there is only electrode erosion for the quartz and alumina based devices, which results in different changes of electrical characteristics. OES calculated results show that with an increase of discharge aging time, electron temperature increases for the polyimide based SDBD device and decreases for quartz and alumina based SDBD devices, while all the gas temperatures of three dielectrics increase with the aging time. Furthermore, compared to vibrational temperature and gas temperature, the distribution of electron temperature is more suitable for evaluating the changes in discharge uniformity during plasma processing.
关键词： electrical characteristics,plasma processing,optical characteristics,surface dielectric barrier discharge,material degradation
更新于2025-09-23 15:21:21
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Flame Propagation Enhancement by Dielectric Barrier Discharge-Generated Intermediate Species
摘要： The interaction between nonthermal plasma (NTP) and fuel-air mixtures was studied both experimentally and by means of simulations, to elucidate their promotional effect on flame propagation. A promotional effect on flame propagation velocity was experimentally observed by generating a dielectric barrier discharge (DBD), prior to spark plug ignition of an n-heptane mixture in a high-pressure and -temperature environment, using a rapid compression and expansion machine (RCEM). A novel method of concentration calibration for mass-spectral analysis was conducted, to determine the intermediate species in the fuel-air mixtures passing through the DBD plasma. The effect of the intermediate chemical species on flame propagation was examined numerically using the PREMIX code, with the observed species being considered as initial additives in the calculations. The promotional effect was reproduced numerically with the addition of alkyl hydroperoxide to an n-heptane/air mixture; and the higher the temperature and leaner the mixture in the parameter region, the more pronounced was the effect. The promotional behavior was examined using reaction path analysis, on the basis of which enhanced low-temperature oxidation reactions, due to the dissociation of the alkyl hydroperoxide, were determined in pre-flame region.
关键词： dielectric barrier discharge,flame propagation velocity,Plasma-assisted combustion,low-temperature oxidation,isomerization
更新于2025-09-23 15:21:01
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Memory characteristics of microcavity dielectric barrier discharge
摘要： The nonlinear resistance characteristics of microcavity dielectric barrier discharge are mainly studied in the paper. A simulation model of microcavity dielectric barrier discharge is herein built to study the relationship between voltage and current in the process of discharge, and thus its I–V characteristic curve can be obtained. The I–V characteristics of the memristor are analyzed and compared with the I–V characteristics of the dielectric barrier discharge; it can be found that the I–V characteristics of the microcavity dielectric barrier discharge are similar to the characteristics of the memristor by analyzing them. The memory characteristics of microcavity dielectric barrier discharge are further analyzed.
关键词： memristor,memory characteristics,microcavity dielectric barrier discharge,I–V characteristic
更新于2025-09-23 15:21:01
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Low-Temperature (<40 ?°C) Atmospheric-Pressure Dielectric-Barrier-Discharge-Jet Treatment on Nickel Oxide for pa??ia??n Structure Perovskite Solar Cells
摘要： A scan-mode low-temperature (<40 °C) atmospheric-pressure helium (He) dielectric-barrier discharge jet (DBDjet) is applied to treat nickel oxide (NiO) thin films for p?i?n perovskite solar cells (PSCs). Reactive plasma species help reduce the trap density, improve the transmittance and wettability, and deepen the valence band maximum (VBM) level. A NiO surface with the lower trap density surface of NiO allows better interfacial contact with the MAPbI3 layer and increases the carrier extraction capability. MAPbI3 can better crystallize on a more hydrophilic NiO surface, thereby suppressing charge recombination from the grain boundary and the interface. Further, the deeper VBM allows better band alignment and reduces the probability of nonradiative recombination. NiO treatment using He DBDjet with a scan rate of 0.3 cm/s can improve PSC efficiency from 13.63 to 14.88%.
关键词： atmospheric-pressure,perovskite solar cells,low-temperature,dielectric-barrier-discharge-jet,nickel oxide
更新于2025-09-23 15:19:57
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Atomization of arsenic hydride in a planar dielectric barrier discharge: Behavior of As atoms studied by temporally and spatially resolved optical emission spectrometry
摘要： The excitation mechanism of arsenic atoms in a planar shaped dielectric barrier discharge (DBD) atomizer with sputtered grid shaped electrodes was studied by optical emission spectrometry (OES) with resolution in time and space. Due to the shape of the electrodes, the DBD design provides optical access to the plasma not only in end-on position but also in side-on direction. By means of an iCCD camera with nanosecond time resolution coupled to a monochromator it was shown that the spatial and temporal development of the plasma emission depends on the discharge gas nature (Ar, He). Applying argon, a dense and constricted plasma filament is formed, whereas in helium a much more homogeneous plasma is ignited. The impact of both plasmas on the emission signal of arsenic atoms was studied employing analyte introduction via hydride generation. The excitation of arsenic temporally follows the emission signal of helium or argon and is spread across the whole discharge volume. The basic discharge propagation dynamics showed similarities to previously presented results obtained by OES in a capillary DBD.
关键词： Arsenic,Optical emission spectrometry,Dielectric barrier discharge
更新于2025-09-19 17:15:36
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Effect of Ar(3p <sup>5</sup> 4p; 2p)+M → Ar(3p <sup>5</sup> 4s; 1s)+M branching ratio on optically pumped rare gas laser performance
摘要： Optically pumped rare gas laser performance is analyzed as a function of the Ar(3p54p; 2p) + M → Ar(3p54s; 1s) + M branching ratios. Due to the uncertainty in the branching ratios, a sensitivity study is performed to determine the effect on output and absorbed pump laser intensities. The analysis is performed using a radio frequency dielectric barrier discharge as the source of metastable production for a variety of Argon in Helium mixtures over pressures ranging from 200 to 500 Torr. Peak output laser intensities show a factor of 7 increase as the branching ratio is increased from 0.25 to 1.00. The collection of Ar* in Ar(1s4) is inversely proportional to the branching ratio and decreases output laser intensity by reducing the density of species directly involved with lasing.
关键词： Argon,Helium,branching ratio,radio frequency dielectric barrier discharge,metastable production,optically pumped rare gas laser
更新于2025-09-16 10:30:52
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Dependence of laser-induced fluorescence on exciting-laser power: partial saturation and laser – plasma interaction
摘要： In recent publications on laser-induced ?uorescence (LIF), the measurements are usually constricted to the region of weak exciting-laser power – the so called linear LIF. In this work, a practical formula describing the dependence of partially saturated ?uorescence on the exciting-laser power is derived, together with practical implementation suggestions and comments on its limitations. In the conclusion, the practical formula F (EL) = α EL / (1 + β EL) is proposed with the limitation for validity β EL ≤ 0.4, where α EL is the hypothetical linear ?uorescence without saturation e?ects, and a more general formula is derived, which is valid for higher values of β EL as well. Extending the range of exciting laser power to the region of partial saturation enhances the signal-to-noise ratio. Such measurements in a surface dielectric barrier discharge further reveal discharge disruption by photoelectrons emitted from the dielectric surface. Methods of control and solution of this problem are discussed.
关键词： dielectric barrier discharge,laser – plasma interaction,partial saturation,laser-induced ?uorescence,signal-to-noise ratio
更新于2025-09-16 10:30:52