The pre-treatment of substrate surfaces prior to deposition is important for the adhesion of physical vapour deposition coatings. This work investigates Si surfaces after the bombardment by energetic Cr ions which are created in cathodic arc discharges. The effect of the pre-treatment is analysed by X-ray diffraction, Rutherford backscattering spectroscopy, scanning electron microscopy and in-d...

here two atoms recombine thus forming a diatomic molecule that can be either chemisorbed or reflected in the gas-phase in a given internal energy state. Reactions (1)-(2) are very often the rate determining step of complex heterogeneous systems of interest in different branches of industrial and technological applications, as for example in the ammonia synthesis, hydrocarbon production, chemica...

Diamond layers have been deposited by hot filament chemical vapour deposition (HF CVD) on TiN-coated steel substrates. After deposition, we could observe separate, well-developed diamond icosahedrons and decahedrons on the surface. We have found that a lower content of methane in hydrogen supports their growth, this being a result of multifold twinning. The quality of diamond layers has been ev...

Abnormal anti-pyramid MoS2/WS2 vertical heterostructures were synthesized by a facile single-step chemical vapour deposition.

Photoluminescence and positron annihilation spectroscopy have been used to characterize and identify vacancy-type defects produced in ZnO films grown on sapphire by metal-organic chemical-vapor deposition. The photoluminescence of the samples in the near band edge region has been studied, paying particular attention to the emission at 370.5 nm 3.346 eV . This emission has been correlated to the...

The use of ZnO template layers grown Pulsed Laser Deposition (PLD) has been seen to produce dramatic improvements in the surface morphology, crystallographic quality and optical properties of ZnO layers grown on c-sapphire substrates by Metal Organic Chemical Vapor Deposition. This paper provides complementary details on the PLD-grown ZnO template properties.

Z. G. Hu,1 A. B. Weerasekara,1 N. Dietz,1 A. G. U. Perera,1,* M. Strassburg,1,2 M. H. Kane,2,3 A. Asghar,2 and I. T. Ferguson2,3 1Department of Physics and Astronomy, Georgia State University, Atlanta, Georgia 30303, USA 2School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA 3School of Materials Science and Engineering, Georgia Institute of ...

Thin alumina films, deposited at 280~ by low-pressure, metal-organic, chemical-vapor deposition on stainless steel, type AISI 304, were annealed at 0.17 kPa in a nitrogen atmosphere for 2, 4, and 17 hr at 600, 700, and 800~ The effect of the annealing process on the adhesion of the thin alumina films was studied using a scanning-scratch tester, type SST-IO1, developed by Shimadzu. The best mech...

A GaInP/AlGaInP multiple quantum well laser structure was grown by low-pressure metalorganic chemical vapor deposition with tertiarybutylarsine and tertiarybutylphosphine. Laser diodes fabricated from this structure lased at room temperature. Photoluminescence ~PL! measurements were performed from 10 to 230 K. The PL energy increased with temperature from 10 to 70 K and decreased above 70 K. Th...

A growth model for the low pressure chemical vapor deposition (LPCVD) of polycrystalline ZnO thin films is proposed. This model is based on experimental observations of the surfacemorphology and crystallographic orientations of the layers at different thicknesses and growth temperatures. It is shown that the films preferred orientation evolves from c-axis to aaxis as the growth temperature is i...