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Charge trapping flash memory devices using (HfO 2 ) 0.9 (Al 2 O 3 ) 0.1 as the charge trapping layer were fabricated, and the effect of post-annealing atmospheres (NH 3 and N 2 ) on its charge storage characteristics was investigated. It was found that NH 3 annealed memory device showed a larger memory window of 7.3 V and improved data...
Density Functional Theory (DFT) calculations were used to determine physical properties of bulk GaN and GaN(0001), i.e. N-terminated surface. The bulk data are in agreement with the theoretical and experimental data reported by Magnuson et al. [M. Magnuson et al., Phys. Rev. B 81 (2010) 085125], demonstrating that bonding in GaN is of a mixed nature in which Ga 4s, Ga 4p, Ga 3d, and N 2s, N 2p orbitals...
A sheath is generated over the rf biased substrate in etching processes, its properties play an important role in determining the transport of reactant species including ions and neutrals toward the substrate, as well as the surface reactions, and as a consequence the evolution of the etching profile. In this work, a multi scale model including the global, sheath and trench model is applied to simulate...
The AC conductivity and dielectric properties of the copper tetraphenyl porphyrin, CuTPP films have been investigated in the frequency range 42 Hz–5 MHz and in the temperature range 303–473 K. The AC conductivity of CuTPP is controlled by the correlated barrier hopping model. The activation energy for alternating current mechanism decreases with increasing frequency which confirms the hopping conduction...
Barium titanate (BaTiO 3 ) ceramics doped with different content of Cr 2 Ti 3 O 9 were obtained by sintering in a temperature rang from 1300 to 1350 °C in air for 2 h. The phase composition, perovskite structural parameters and ferroelectric properties have been obtained by X-ray diffraction and ferroelectric measurements as a function of chemical composition and temperature...
The article presents the optimisation of the organisation of the vacuum carburising process in terms of the number and duration of “boost”/“diffusion” stages. The processes of two- and multi-segment carburising were examined with regard to the process duration and effectiveness of carbon transfer from the atmosphere to the charge surface. It was shown that division of the process into two segments...
Interfacial electronic structures and photoemission spectral characteristics of Ca/MEH–PPV/Au were studied by one and two photon photoemission spectroscopy. For a pristine MEH–PPV film, the work function was measured to be 4.0 eV. This value is 1.1 eV lower than that of a bare Au substrate. At a Ca coverage of 3 Å, the work function was sharply decreased to 2.6 eV. Upon further deposition, it was...
Focused ion beam milling is used to nanopattern doped silicon oxide layer in view of light trapping application in thin film photovoltaics. Different working conditions, such as ion beam currents, milling times, dwell times, etc., are optimized in order to improve the nanochannel shape by reducing the effect of redeposition of sputtered target material on the sidewalls. This phenomenon, due to ion...
A modified scheme to tune the Schottky Barrier Height (SBH) of NiSi effectively by means of dopant segregation (DS) technique is presented. This scheme consists of the following steps: (1) The deposited Ni films undergo a rapid thermal anneal (RTA1) at 300 °C/60 s to form Ni-rich silicide followed by removal of un-reacted Ni; (2) implant boron (B) or arsenic (As) into pre-formed Ni-rich silicide and...
Carbon nanotubes (CNTs) with different orientation and lengths were grafted onto carbon fibers by catalytic chemical vapor deposition to produce hybrid preforms that were used to reinforce carbon/carbon (C/C) composites. Compressive property tests indicated that these C/C composites have obvious improvements in out-of-plane compressive strength, compared with pure C/C composites. Furthermore, the...
The design work of 95 GHz, 100 kW gyrotron for Active Denial System (ADS) application is reported in this manuscript. The mode selection is performed considering the various technical constraints. Particle-in-Cell code and indigenously developed code based on the generalized non-linear formalism are used in the beam–wave interaction computation and cavity design. Both the codes show good similarity...
Polytetrafluoroethylene (PTFE/Teflon) is an excellent material in applications demanding high thermal and chemical stability. Imparting water repellency in such materials can be an advantage when they are used for biomedical and electric insulation applications. Using Ar + O 2 plasma treatment superhydrophobic PTFE surfaces were prepared. The plasma treated PTFE samples exhibited a change...
In this work we report about the template-confined dewetting of Au nanoscale film on SiC substrate in view of a surface patterning control. In this approach, the Au surface pattern order, on the SiC substrate, is established by a template confined deposition on a micrometric scale. Then, a film dewetting process is induced by thermal processes. Using scanning electron microscopy analyses, we studied...
A facile electrochemical synthesis of Au-polypyrrole (Au-PPy) composite films has been reported. The synthesized composite films were irradiated with a 1.25 MeV Co-60 gamma radiation with doses ranging from 500 to 1500 kGy and the corresponding changes in structural properties of the composites were studied. The structural investigation of Au-PPy composite films were performed by using X-ray diffraction...
Few investigations have been carried out on the influence of the variation of pulse current parameters on the anodized aluminum. The present paper deals with some experimental results regarding the influence of pulse current parameters on the nanostructure and color absorption ability of colored anodized aluminum. Under these conditions, the nanostructure and the color were found to be dependent on...
In this work, fine-lamellar structured thermal barrier coatings (TBCs) were deposited by high efficiency supersonic atmospheric plasma spraying (SAPS). The microstructure and mechanical properties of coatings were studied. It was found that the fracture toughness and bonding strength of as-sprayed coatings were as high as 3.7 ± 0.4 MPa m 1/2 and 52 ± 4 MPa, respectively. Due to the low porosity,...
Spinel LiMn 2 O 4 cathode material was rapidly prepared by solid-state combustion synthesis based on a two-stage calcination progress which used lithium carbonate and manganese carbonate as raw materials and citric acid as a fuel. The structure and physicochemical properties of the obtained LiMn 2 O 4 powders were investigated by thermogravimetric analysis (TG) and...
Titanium carbide (TiC) nanowires have been successfully synthesized on porous ZrSiO 4 ceramic substrate via infiltrating and a chloride-assisted carbothermal reduction. In this process, the phenolic resol, tetrabutyl titanate and NaCl were used as precursors and Ni(NO 3 ) 2 ·6H 2 O as a catalyst. On the basis of the structural, morphological and elemental analyses characterized...
In order to further enhance the tribological properties of TiN coatings used on mechanical parts, W ion implantation with Metal Vapor Vacuum Arc (MEVVA) source was carried out on PVD TiN coatings at the implantation dose as high as 9 × 10 17 ions/cm 2 . The microstructures of the TiN coatings were investigated by Scanning Auger microprobe (SAM), X-ray diffraction (XRD), and X-ray...
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