The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Here, we report the synthesis of ultra-long CdS nanowires with aspect ratio ∼8 × 10 4 by simple route of thermal evaporation technique. A change in the vertical arrangement of quartz boats leads in to the synthesis of ultra-long CdS nanowires via high degree of condensation. This technique is seen to be cost effective and easy. The growth of the nanowires is found to be increased very rapidly...
Scanning tunnelling microscopy (STM) and Auger electron spectroscopy (AES) have been used to investigate the growth morphology of ultra-thin Pb films on the Ni 3 Al(111) face at room temperature. A previous study [K. Miśków and A. Krupski Appl Surf Sci 273, 2013, 554] using low-energy electron diffraction (LEED) and real time Auger intensity recording has demonstrated that an initial two-dimensional...
We present a comparison of the experimental and simulated results of the thermionic hairpin-source, electron beam assembly using the SLAC electron beam trajectory program (EGUN). The gun was optimized for maximum emission current density and beam convergence in the post anode region. Therefore, by optimizing different parameters, an emission current density of 32 A/cm 2 with maximum beam convergence...
Temperature dependence of Debye–Waller factors such as mean square relative displacement (MSRD) and mean square displacement (MSD) in extended X-ray absorption fine structure (EXAFS) and related spectra of semiconductors have been studied based on statistical moment method. This work illustrates our derived theory for calculation and analysis of temperature-dependent MSRD of semiconductors and our...
Insulating SiO x film was deposited with newly developed plasma source at low temperature for fabrication of flexible devices on plastic substrate. The plasma was generated with electromagnetic field by two facing electrodes including magnets inside and covered with SiO 2 targets. The higher deposition rate was achieved from 2.0 to 33 nm/min, with the mixture of tetramethylsilane and...
Si quantum dots (Si-QDs)/SiO 2 multilayer films have been fabricated on Si substrate, and the carrier transport properties of heterojunctions consisting of Al:Si/SiO 2 :Si:Al are studied. The current density–voltage curves show that high density Si-QDs lead to higher current density and rectifying ratio. The carrier transports in the forward voltage are controlled by Ohmic resistance...
A nanostructured layer was fabricated by using fast multiple rotation rolling (FMRR) on the surface of Ti-6Al-4V alloy, with grain size 10–19 nm in the top surface layer by means of XRD and TEM analysis. A deformation layer with thickness about 80 μm is clearly observed in the cross section of FMRR sample. The microhardness of the FMRR sample has an obvious change along the depth from about 368 HV...
This paper investigates the effect of the reactive gas mixture (N 2 + O 2 + Ar) and oxidation of the nitride layers on the system stability during the reactive sputter deposition of TiO x N y thin films. The present research is an extension of previous investigations conducted by Severin et al. (Appl. Phys. Lett., 88 (2006) 161504) and Duarte et al. (Appl. Surf. Sci...
A simple method to generate a standard partial pressure p s by using various gas species has been developed for in-situ calibration of IGs and QMSs. Generating p s requires both introducing a test gas with known flow rate Q and estimating the effective pumping speed S of the high vacuum pump. The former is realized by introducing a test gas through a standard conductance element (SCE)...
The monopole magnet arrangement under sputtering target has been proposed to improve target utilization in radio frequency magnetron plasma. Magnetic field analysis simulation indicates that a magnetic tunnel on the sputtering target for the monopole arrangement increases twice as much as that for the conventional arrangement. The profiles of the ion flux to the target and the target erosion depth...
Nanometer-thickness SiGe alloy layers were synthesized by direct Si ion implantation in Ge (100) wafers at different fluences followed by high temperature annealing. The cross-sectional transmission electron microscopy and secondary ion mass spectrometry reveal the formation of a thin Si-rich crystalline layer in the near-surface region. The micro-Raman spectroscopy and X-ray reflectivity techniques...
This paper presents the surface structure changes of Fe–Cr–Ni alloy wires uses as anode grid of vircator during relativistic electron beam irradiation. It is observed that the anode materials are deposited on the cathode surface. The deposited anode materials are in fact new impurities, possibly lowering the uniformity of explosive electron emission of carbon fiber cathode. The results of alloy wires...
Indium nitride (InN) thin films were deposited on anisotropic silicon [Si(110)] and photoelectrochemical etched silicon [Psi(110)] substrates by reactive radio-frequency sputtering. All deposited films showed wurtzite nanocrystalline InN films with a (101) preferred growth orientation. The optical properties of the nitrogen-rich InN thin films were investigated under various deposition gas concentrations...
Poly(methacrylic acid) (PMAA) chains were cross linked onto the backbone of gum ghatti (Gg) using N,N′-methylene-bis-acrylamide (MBA) and ammonium persulfate (APS) as a cross linker-initiator system in a vacuum oven. The cross linking of the PMAA chains on the polysaccharide backbone was confirmed by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and scanning electron microscopy...
One kind of quaternary thin films of SiAlON were deposited by ion beam sputtering method at ambient temperature, through a sintered SiAlON ceramic target. Ultraviolet, visible and near infrared (UV–VIS–NIR) Spectrophotometer, Fourier transformed infrared spectroscopy (FTIR), glancing incidence X-ray diffraction (GIXRD) and X-ray photoelectron spectroscopy (XPS) were employed to characterize the optical,...
Realization of intelligent thermal vacuum sensors based on multipurpose thermopile microelectromechanical (MEMS) chips is presented in this work. These vacuum sensors satisfy the main requirements for contemporary sensors, they are cost-effective in both fabrication and operation, and simple to use. Intelligent devices based on two types of thermal sensors, A-type with Al heater, and P-type with p...
Antibacterial activity of zinc-doped titania (Zn/TiO 2 ) nano-materials through different anions (ZnCl 2 /TiO 2 , Zn(Ac) 2 /TiO 2 , Zn(NO 3 ) 2 /TiO 2 and ZnSO 4 /TiO 2 ) doped calcinated at 500 °C under visible light irradiation and in the dark was investigated. A simple sol–gel method was used to synthesize TiO 2...
Al 2 O 3 ceramic coatings with different metallic bonding layers, i.e. Ni60, NiAl and FeAl, were prepared by the plasma spraying technique. To study the effect of bonding layer on corrosion behavior of plasma sprayed Al 2 O 3 coatings, metallic coatings were also prepared for direct use as working layer. Phase analyses of the coatings were determined by X-ray diffraction...
High-quality tin-doped indium oxide with moderate resistivity (1.7–2.0 × 10 −3 Ω cm) for use on a resistive-type touch screen was deposited at room temperature on a polyethylene terephthalate substrate via in-line moveable magnetron sputtering. In order to examine its feasibility for use as an upper electrode screen of a touch panel, electrical and optical properties were investigated by...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.