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Organic light-emitting diode-zinc oxide (OLED–ZnO) hybrid nanomaterials are successfully prepared by the incorporation of ZnO (a few weight percent) under simple and mild reaction conditions. Three different types of organic light-emitting materials, Fluorescein, Tris(8-hydroxyquinoline) aluminum, and poly(fluoresceinyl terephthalyl benzoate-co-bisphenol A terephthalate) are chosen to prepare the...
Metal nanocluster composite glass was formed by Cu ion implantation into silica using metal vapor vacuum arc (MEVVA) ion source. The microstructural properties of the nanoclusters were analyzed by optical absorption spectra and transmission electron microscopy (TEM). Third-order nonlinear optical properties of the nanoclusters were measured at 1064nm excitations using Z-scan technique. The nonlinear...
In high vacuum systems or materials that have fine capillaries, the molecular transport can be characterized as being free-molecular flow regime. In this flow regime intermolecular interactions can be ignored and flow is determined entirely by molecule–surface collisions. The transport of gases and volatile compounds through porous media and filters with variety of geometries is of great interest...
Nickel ferrite NiFe 2 O 4 (NFO) thin films have been prepared on a Si substrate (NFO/Si) and La 0.7 Sr 0.3 MnO 3 (LSMO)-coated Si (100) substrate (NFO/LSMO/Si) by RF magnetron sputtering. The microstructures and magnetic properties of the two films were systematically investigated. X-ray diffraction (XRD) and atomic force microscopy (AFM) revealed that highly...
High-quality Cd 1−x Mn x Te polycrystalline films with (1 1 1) preferred orientation were deposited by close-spaced sublimation (CSS) method. The XRD and optical absorption analysis indicated that the band gap of the film was about 1.6 eV. The as-grown Cd 1−x Mn x Te films exhibit quite low photovoltaic performance when used to make cells with CdS as the hetero-junction...
Nano-crystalline CdZnTe films were fabricated by thermal vacuum evaporation. The structure and surface morphology of the CdZnTe films were determined by XRD and SEM. The CdZnTe films were poly-crystalline with preferential (111) orientation. The CdZnTe films exhibited a typical particle size of 15 nm and a blue shift in the absorption with an effective band gap of 2.26 eV. An amorphous Te interfacial...
Surface treatments on biomaterials using several methods have greatly reduced the in vivo bacterial attachment, surface colonization and formation of biofilm. In this study, the effect of silver (Ag) ion release against in vitro antibacterial activity and cytotoxicity of 1–4wt% Ag doped titania (TiO 2 ) thin film coatings were evaluated. These coatings were deposited for 1–6 h onto stainless...
Computational fluid dynamics (CFD) was employed to investigate the effects of electrode architecture, the arrangement of multi-hollows on the surface of the porous electrode, electrode distance and gas flow rate on the distribution of SiH 3 molar fraction. A two-dimensional laminar flow coupled with heat transfer, multi-species chemistry are simultaneously calculated through CFD for improving...
An investigation of selected contacts for indium doped cadmium sulphide (CdS:In) thin films was performed through the analysis of the I–V characteristics in the dark and room light at room temperature. Indium, aluminum and silver were selected as contacts where two strips of each metal were vacuum- evaporated on the surface of the film. All of these metals could form ohmic contacts, but indium had...
Lattice damage and evolution in 6H-SiC under He + ion irradiation have been investigated by the combination of Rutherford backscattering in channeling geometry (RBS/C), Raman spectroscopy, UV–visible spectroscopy and transmission electron microscopy (TEM). 6H-SiC wafers were irradiated with He ions at a fluence of 3 × 10 16 He + cm −2 at 600 K. Post-irradiation, the...
The present study reports on kinetics of borided AISI M2 high speed steel. Boronizing thermochemical treatment was carried out in a solid medium consisting of EKabor powders at 850 °C, 900 °C and 950 °C for 2, 4, 6 and 8 h, respectively. The presence of borides FeB and Fe 2 B of steel substrate was confirmed by optical microscopy and scanning electron microscopy (SEM). The results of this...
Silicon carbon nitride thin films were deposited on Si (100) substrate at room temperature by plasma assisted radio frequency magnetron sputtering. The bonding structure and properties of SiCN films irradiated by pulsed electron beams were studied by means of X-ray photoelectron spectroscopy and nano-indentation. The results showed that electron beam irradiation had a great effect on the structure...
Hot melt splashes often take place during electromagnetic casting silicon, which break the stable pulling process and endanger the safety of equipments in the vacuum chamber. Investigations are carried out to analyze the causes of melt splashes and put forward measures to prevent the happening of them. Pores with different sizes are observed in perpendicular sections of the left ingots, their surface...
Iridium coating was produced on various substrates using a double glow plasma. The effects of bias voltage and gas pressure on orientation and microstructure of the coating were studied. The orientation, microstructure and composition of the coating were evaluated by X-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy. The results showed that iridium coatings on various...
In modern particle and accelerator physics as well as in nuclear fusion experiments turbo-molecular pumps (TMP) are used in close proximity to super-conducting magnets. This can cause considerable heating of the fast moving rotor by eddy currents, which can ultimately lead to the destruction of the pump. Motivated by the KATRIN neutrino experiment, where TMPs are operated close to super-conducting...
Wurtzite aluminum nitride (w-AlN) thin films are of great interest for electro-acoustic applications and their material properties have in recent years been extensively studied. One way to tailor material properties is to vary the composition by adding other elements. Boron is an element that can take the place of aluminum in the crystal lattice of w-AlN. In the present study, polycrystalline w-(Al,B)N...
Composite thin films of HfO 2 :SiO 2 with wide range of relative composition from 100:0 (pure HfO 2 ) to 10:90 have been deposited on fused silica substrates by co-evaporation technique and the optical properties of the films have been studied by measuring the transmission spectra of the samples by spectrophotometer. Different important optical parameters viz., band gap, refractive...
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