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An apparatus for making two-dimensional photon images of tribomicroplasma in controlled gas pressures was constructed. Using the apparatus, the dimensions, patterns, and photon emission intensities of the tribomicroplasma were investigated under various reduced air pressures when sliding a diamond hemisphere pin on a sapphire disk. It was found that the shapes and patterns of the two-dimensional plane...
Analysis of Zn/p-Si Schottky diodes (SDs) with high resistivity has been given by admittance spectroscopy. The importance of the series resistance in the determination of energy distribution of interface states and especially their relaxation time in the SDs with high resistivity has been considered. The effect of the series resistance on capacitance-conductance/frequency characteristics has been...
It is known that charged particles emitted from the region of electron beam (EB) interaction with the material being processed, are an important source of information for the understanding of EB welding processes. Measurements for the three largest groups of charged particles, namely, backscattered electrons, true secondary electrons and ions are presented here. It was estimated that only the signals...
In this work, we fabricate 1-in carbon nano tubes (CNTs) flat lamp of diode and triode structure. The CNTs have been directly grown on soda-lime glass substrate by thermal growth method. To know the optimized flat lamp structure, we have simulated the electric field distribution in these structures by the Maxwell simulator. The metal-mesh grid is inserted between an anode and cathode plate for dispersion...
High surface area materials can have a number of applications including use as pyrophoric devices, sensors, laser mirrors, filters, thermal barriers and catalysts. The aim of this work was to deposit highly porous thin films capable of undergoing a spontaneous pyrophoric reaction and igniting a suitable substrate material. Magnetron sputtering was the chosen deposition technique as it enables reproducible...
The paper presents studies on the electrical properties of cylindrical shape samples of insulators made from polyamide, epoxy resin, polymethyl methacrylate, and electrical porcelain, located in vacuum at a pressure of 0.1mPa. The insulator samples had a diameter of 20mm and a height of 1-10mm. The study was performed with an alternating voltage of 50Hz in the range up to 70kV (peak). The examination...
Diamond-like carbon films were deposited on p-type silicon substrates by ECR-plasma decomposition of methane. The films have been characterized by scanning electron microscopy and Fourier transformed infrared spectroscopy. The current-voltage (I-V) and capacitance-voltage (C-V) characteristics were measured allowing interface trapped charges to be estimated. The density of states near to the Fermi...
The influence of plasma heating of the Si and glass wafer substrates on silicon dioxide (SiO 2 ) deposition rates by a tetraethylorthosilicate/O 2 supermagnetron (high-density) plasma CVD were investigated. With a fixed RF power of 100W supplied to both upper and lower electrodes, the SiO 2 deposition rate on the Si wafer substrate decreased with increasing wafer-stage temperature,...
Preferred growth of nanocrystalline silicon (nc-Si) was first found in boron-doped hydrogenated nanocrystalline (nc-Si:H) films prepared using plasma-enhanced chemical vapor deposition system. The films were characterized by high-resolution transmission electron microscope, X-ray diffraction (XRD) spectrum and Raman Scattering spectrum. The results showed that the diffraction peaks in XRD spectrum...
A small UHV helium bath cryopump with low cryoliquid consumption has been designed, manufactured and tested. The cryopump is designed to keep UHV in electron optical devices without generation of disturbing electromagnetic fields or vibrations. The outer volume of its shell is 15l, the filling volumes of liquid helium (LHe) and liquid nitrogen (LN 2 ) are 3.0l and 3.4l, respectively. Operating...
We report the recorded current-voltage characteristics of a RF capacitive discharge in oxygen. Low-frequency oscillations of the plasma potential in a kilohertz frequency range are observed to accompany the transition of the discharge from a weak- (α-) to a strong-current (γ-) regime in the low-pressure range. The weak-current regime of the RF capacitive discharge is observed within the pressure range...
The thermal stability of Ta(111) face covered with Pd layers of different thickness was examined by the complementary scanning tunnelling microscope (STM), low-energy electron diffraction (LEED), Auger electron spectroscopy and Δφ techniques. It has been found that for thin layers of θ<3 monolayer (ML) heated to 450K, uplifts appear on the surface that may be treated as an agglomerated form of...
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