The constriction of the positive column a glow discharge in argon was studied both experimentally and theoretically. In experiments direct current maintained cylindrical glass tube 3 cm internal diameter 75 length. voltage–current U(I) characteristics were measured at gas pressure P from 1 to 120 Torr wide range currents. At > 20 display classical hysteresis effect: transition diffuse contracted form (with increasing current) occurs higher than that for reverse decreasing current). It also...

An atmospheric pressure dielectric barrier discharge (DBD) was applied for the deposition of silica‐like moisture films on polyethylene 2,6 naphthalate foil. The diffuse plasma sustained between two cylindrical drum electrodes in N 2 /O /Ar gas flow with addition tetraethyl orthosilicate. chemical composition, morphology and water vapour transmission rate permeation layers were studied as a function dynamic substrate temperature. It demonstrated that dense 100 nm thick good ≈1.8 × 10 −3 g ·...

Pathways of formation and temporal evolution the diffuse dielectric barrier discharge at atmospheric pressure were experimentally studied in this work by means optical (fast imaging camera) electrical diagnostics. The chosen model system is relevant for applications plasma-enhanced chemical vapor deposition thin silica-like film on polymeric substrate, from cost-efficient gas mixtures Ar/N2/O2/hexamethyldisiloxane. It was found that can gradually experience phases homogeneous low current...

The diffuse dielectric barrier discharge in atmospheric pressure air was applied for the thin film deposition on polymeric web industrially relevant roll-to-roll configuration. silica-like performed using admixture of hexamethyldisiloxane precursor to flow. Fast imaging at 2 μs exposure time confirms plasma uniformity a single current pulse scale. Morphology and composition analyses indicate that process results ultrasmooth films (roughness comparable initial substrate roughness) shows...

Abstract SiO 2 ‐like layers deposited by means of the developed atmospheric pressure glow‐like DBD assisted CVD technology exhibit remarkable film properties, reported for first time. The films synthesized in a roll‐to‐roll mode on polymeric webs, are as smooth substrate, irrespectively precursors (TEOS or HMDSO) and reactive gases (N air) employed. Detailed AFM investigation morphology, surface roughness auto correlation length ( ξ ) show that they negligibly influenced with thickness...

Abstract This work reports on the main competing processes and their contribution to properties of SiO 2 layers polymers in large area AP‐PE‐CVD from ArN O ‐HMDSO mixtures. The detailed space resolved surface analysis statically deposited films showed smooth x vicinity gas injection, as by HMDSO radicals. At effluent, due depletion, non‐depositing species interact with polymer induce rough deposits high carbon content. competition plasma–polymer interaction radicals deposition, is further...

A dielectric barrier discharge (DBD) plasma was applied to reactivate palladium on alumina (Pd/Al2O3) waste catalysts at extreme conditions, addressing a common problem of reusing the spent instead discarding them. Experimental studies effect gas composition in process reveal different extent coke elimination and electrochemical performance reactivated Pd/Al2O3 catalysts, ranked as Ar-treated > N2-treated O2-treated untreated catalyst fixed flow rate regeneration time. The time...

Silica-like coatings were deposited on polymer foils in APG discharge a roll-to-roll configuration. The dependence of film structure and chemical composition the conditions during deposition process was studied by means SEM, ATR-FTIR, XPS analysis. influence oxidant concentration properties is analyzed discussed. It observed that pulsing suppresses dust formation atmospheric plasma and, therefore, provides uniform coatings.

Atmospheric-pressure diffuse dielectric barrier discharges (DBDs) were obtained in Ar/O2 gas mixture using dual-frequency (DF) excitation at 200 kHz low frequency (LF) and 13.56 MHz radio (RF). The dynamics the plasma generation mechanism studied by means of electrical characterization phase resolved optical emission spectroscopy (PROES). DF results a time-varying electric field which is determined total LF RF voltage spatial ion distribution only responds to component. By tuning amplitude...

An environmentally friendly microplasma-based method is applied to produce crystalline lanthanide doped nanophosphors of controllable photoluminescence properties.

An atmospheric pressure microplasma technique is demonstrated for the gas phase synthesis of Ni nanoparticles by plasma‐assisted nickelocene dissociation at different conditions. The process and products are characterized complementary analytical methods to establish relationship between operational conditions product properties. innovation show proof‐of‐principle a new route which offers access less costly poisonous reactant, higher quality product, simple, continuous pre/post...

A glow like atmospheric pressure dielectric barrier discharge in a roll‐to‐roll setup was used to synthesize 90 nm silica‐like bilayer encapsulation films composed of 30 dense “barrier layer” and comparatively less 60 “buffer onto polyethylene 2,6 naphthalate substrate by means plasma enhanced chemical vapor deposition. Tetraethyl orthosilicate as the precursor gas, together with mixture nitrogen, oxygen, argon. The microstructure, composition, morphology, permeation properties were studied...

The synergy between fast (1600 nm · min −1 ), roll‐to‐roll plasma‐enhanced chemical vapor deposited (PE‐CVD) SiO 2 layers and plasma‐assisted atomic layer (PA‐ALD) ultra‐thin Al O 3 films has been investigated in terms of moisture permeation barrier properties. effective intrinsic water transmission rates (WVTR) were studied as a function the number ALD cycles. It was demonstrated that synergistic combination silica buffer on polymer with an (≤ nm) alumina film can provide excellent (10 −5...

Abstract The synthesis of metallic nanoparticles has been long standing interest, primarily induced by their novel and unique properties that differ considerably from bulk materials. Despite various methods have developed, it is still a challenge to produce high-quality with controllable in simple, cost-effective environmentally benign manner. However, the development microplasma-assisted technology can bring an answer this formidable challenge. In present work, four main microplasma...

This work reports on an effective approach for the continuous synthesis of Ag–Au nanoparticles (NPs) by integrating low-temperature plasma with a microfluidic technique. Crystalline nanoalloys are demonstrated to be produced, and composition can effectively tuned in-flight controlling concentrations or flow rates reactants. The surface-enhanced Raman scattering (SERS) properties NPs further validated through detection rhodamine 6G crystal violet (CV) analytes. silicon substrates coated have...

This paper reports on the experimental study of dynamic evolution a dielectric barrier discharge in an atmospheric-pressure plasma enhanced chemical vapor deposition reactor using gated intensified charge coupled detector. It is observed that diffuse atmospheric pressure glow formed via transition from Townsend-like or, alternatively, can be initiated by filamentary discharge. The formation current spot followed lateral expansion

A 1D drift-diffusion model is used to study atmospheric-pressure dual-frequency (DF) dielectric barrier discharges in argon using the plasma modeling platform PLASIMO. The simulation exhibits an excellent agreement with experimental results and gives insight into DF dynamics e.g. electric field, sheath edge profiles, ionization/excitation rate electron energy distribution function (EEDF) profiles. indicate that due radio-frequency oscillation, thus are temporally modulated. As a result,...

This letter reports a novel approach to improve the uniformity of atmospheric-pressure dielectric barrier discharges using dual-frequency excitation consisting low frequency (LF) at 200 kHz and radio (RF) 13.56 MHz. It is shown that due periodic oscillation RF electric field, electron acceleration thus gas ionization temporally modulated, i.e. enhanced suppressed during each cycle. As result, discharge development slowed down with lower amplitude longer duration LF current. Hence, field...

Abstract The development of the morphology and surface roughness amorphous SiO 2 ‐like films, on various polymeric substrates was analyzed by atomic force microscopy. inorganic oxide films were deposited from organo‐silicon precursors with different reactive gases using dielectric barrier discharge assisted chemical vapor deposition (DBD‐CVD) at atmospheric pressure in a roll‐to‐roll configuration. Detailed study statistical parameters characterizing shows that DBD‐CVD grow conformal...

Silica‐like films for moisture barriers were deposited on a polymeric substrate in an Atmospheric Pressure PECVD reactor using N 2 /O /TEOS gas mixture. Statically silica characterized by spatially resolved ATR FTIR and revealed clear gradient the silanol concentration. Silanol is impurity network, resulting pore formation, thus higher content leads to decrease film density. Hence spatial non‐uniformity static profile results density thickness of web‐rolled films. The gradual transition from...