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Quantification of hydrogen fraction in the gas mixture with inert gases kept in a small enclosure of the gas surge arrester (GSA) is a challenging task. Hydrogen greatly influences device properties, but as an omnipresent gas it represents also the background of any mass spectrometer. Hydrogen fraction in a particular GSA was quantified after its puncture in an evacuated batch inlet and subsequent...
The fabrication of a double-layered graphene/poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) conductive film was reported, in which the PEDOT:PSS film was obtained by using spray-coating technique. The optical and electrical properties of the double-layered conductive films were investigated. A flexible green organic light emitting device (FOLED) based on the graphene/PEDOT:PSS...
A novel ion implantation and Al/AlN/CrAlN/CrN/MoS 2 gradient duplex coating was used to improve the wear-corrosion synergy performance of AM60 magnesium alloy. The wear and corrosion behaviors of the as-deposited gradient duplex coating were subsequently investigated. The results showed that the gradient duplex coating has excellent wear resistance with the wear rate of 2.31 × 10 −6 ...
Single-layer graphene (SLG) was synthesized by using chemical vapor deposition (CVD) technique. A novel method was developed to disperse the as-synthesized SLG in poly (methyl methacrylate) (PMMA) matrix. Current–voltage measurements on the Al/SLG:PMMA/Al devices showed rewritable resistance switch properties with volatile memory effect due to the existence of the graphene sheets. The operating mechanisms...
Densely packed and highly ordered CdSe quantum dots (QDs) arrays were prepared through a slow evaporation route; to study the photo-generated charges property of ordered CdSe QDs arrays, illumination induced charge separation in the CdSe QDs arrays were investigated through surface photovoltage (SPV) technology based on lock in amplifier. The significantly enhanced SPV signal of CdSe QDs arrays after...
Microcrystalline silicon (μc-Si) thin films with low impurity (oxygen) concentrations were prepared by radio frequency hollow electrode enhanced glow plasma (RF-HEEPT). By using metal gasket seals with the RF-HEEPT system, the oxygen concentration in the thin films was reduced to 3.0 × 10 17 cm −3 , which is approximately two orders of magnitude less than that of films fabricated...
A transient gas flow through a rectangular slit is simulated on the basis of unsteady S-model kinetic equation. The flow into vacuum and at two pressure ratios between the reservoirs are considered for a wide range of the rarefaction parameter lying from the free molecular to the near continuum regime. The time of steady flow establishment is obtained and it is found that this time depends on the...
Electrostatic potential variation across surface of a diamond/β-SiC nanocomposite thin film is obtained using scanning Kelvin probe microscopy. An average electrostatic potential of ∼ −120 mV is measured on the surface (5 × 5 μm 2 ) of the nanocomposite thin film. Using this value and the nominal work function of the probe, the work function values of the constituents could be estimated. In...
This work presents a simplified technique for nanotexturing SiO 2 surfaces. Nanotextures were obtained by a mask-less dry-etching process of a spin-coated polymethylmethacrylate (PMMA) on a SiO 2 surface. Dot-like nanostructures containing small Al particles were initially formed through reactive ion etching (RIE) using CHF 3 /Ar etchants for an etching duration of 60 s. The...
The interpretation of the ion-induced pressure bump observed in CERN's Intersecting Storage Ring (ISR) is re-examined. An improved formulation is proposed by combining the time-variation of the number of molecules on the chamber wall with the pressure change. Assuming proper conditions on the molecules contributing to the ion-desorption, the pressure bump can be described with a consistent manner...
A conventional residual gas analyzer (RGA) has been utilized for the measurement of gaseous substances of molecular weights far beyond the range of the instrument. The novel method, termed CPC (“crack-product calibration”), is based on the evaluation of just one or few selected crack products within the range of the RGA. Calibration is achieved by guiding a quartz-microbalance-controlled molecular...
The first-principle technique has been employed to determine the atomic structure of nitrous oxide (N 2 O) monolayer and the N 2 O/Ag system in different coverage. The potential structures of N 2 O monolayer on the virtual and real Ag(100), Ag(110) and Ag(111) surfaces have been proposed. The stable structure is N 2 O monolayer adsorbed on Ag(110) through the terminal...
A linearity test of the quadrupole mass spectrometer signal can be performed by using the pressure generated by the flow rate of a secondary leak as a fix point and varying the flow rate by a primary gas flowmeter around this value. Applying this method, we have investigated three different quadrupole mass spectrometer in a range of helium partial pressures between 10 −9 Pa and 10 −4...
Silicon carbide nitride (SiCN) films were deposited on p-Si (100) substrates by dual ion beam reactive sputtering deposition with various assisting ion beam energies at room temperature. X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy, Fourier transform infrared spectroscopy, and Raman scattering measurement were used to investigate the properties of the films. Results...
A catalytic probe made of a nickel thin wire is introduced into the gas flow downstream of an atmospheric pressure dielectric barrier discharge ozonizer to examine the ozone dissociation process on a catalytic surface. The probe is placed downstream far from the discharge to avoid the influence of reactive species other than ozone. The measured voltage variation across the probe wire under a constant...
In this research, we have used glancing angle deposition (GLAD) RF sputtering technique with various angular speeds ranging from 5 to 30 RPM to fabricate polytetrafluoroethylene (PTFE, Teflon) coated Tungsten on glass substrate for producing hydrophobic surface. According to scanning electron microscopy (SEM) observations, Tungsten nanorods were formed on the substrate with average diameter and length...
In this paper, Cu 2 SnS 3 film with about 600 nm thickness was successfully prepared, for the first time, by one step sol–gel spin coating route on glass substrate. The sample was characterized by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM) and UV–vis spectroscopy. The X-ray diffraction result showed that the obtained layer was...
Electrical characterization of the p-Si/SiGe/Si(100) surface covered by organic molecule 9,10 Phenanthrenequinone (PQ), have been evaluated via analysis of hole gas transferred in the SiGe quantum well at low temperature. The enhancement in the density of two dimensional hole gas (2DHG) formed in the SiGe quantum well in the structure covered by PQ thin film is attributed to electrical passivation...
We investigated the effects of thickness on the electrical, optical, structural, and morphological properties of Al and Ga co-doped ZnO films (AGZO) grown by linear facing target sputtering (LFTS) for use as a transparent contact layer (TCL) in GaN-light emitting diodes (LEDs). Below a critical thickness of 200 nm, the resistivity and optical transmittance of the AGZO films were significantly affected...
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