V. M. Kashkarov

Solid-State Reactions Underlying the Thermal Oxidation of Ni/InP Structures

The layers grown by thermal oxidation of indium phosphide coated with vacuum-deposited nickel were characterized by ellipsometry, IR spectroscopy, x-ray energy spectroscopy, x-ray diffraction, and electrical measurements. The results demonstrate that the layers consist mainly of indium phosphates and nickel phosphates and polyphosphates. The Ni layer acts as a barrier which prevents phosphorus diffusion to the surface and ensures the growth of phosphates and polyphosphates in the surface layer. A model for the thermal oxidation of Ni/InP structures is proposed.

Surface modification of composites with metal nanoparticles

This work examines the possibility of using copper, nickel, and cobalt nanoparticles in the electrodeposition of nickel coatings and for surface modification of porous silicon, and also colloidal silver particles for surface modification of silver-containing polymer-matrix composites. It is shown that the deposition of metal nanoparticles may influence the morphology, electronic structure, and phase composition of the surface and the catalytic, electrical, and optical properties of the material.

Thermal Oxidation of InP Promoted by the Formation of N2O

The thermal-oxidation growth of dielectric films on InP substrates with NH4NO3 introduced into the oxidizing atmosphere is studied experimentally. Due to the simultaneous formation of N2O from NH4NO3, this type of thermal oxidation of InP is found to run faster than the oxidation involving the external supply of humid O2 or N2O. The films thus produced demonstrate adequate dielectric performance.

Effect of VO+2 Cation on the Nitric Acid Oxidation of Indium Phosphide

The nitric acid oxidation of indium phosphide was found to be notably accelerated by VO+2. The reaction scheme of the process was proposed. The composition of the forming oxide layers was determined by IR and x-ray energy spectroscopy techniques.

Calcite and apatite coatings on titanium

A new method was used to deposit coatings containing calcium carbonate and calcium phosphates onto titanium. The presence of calcite and hydroxyapatite crystals in specimens as the major phases was proved by X-ray diffraction analysis, IR spectroscopy, elemental analysis, and electron microscopy. The inorganic coatings were revealed to have good adhesion to titanium and be stable in aqueous solutions.

Role of tungstic acid in thermal film growth on indium phosphide

The influence of tungstic acid on oxide film growth during indium phosphide thermal oxidation is studied. When H2WO4 is added to the reaction zone, tungsten is captured by growing layers and heteropoly compounds are formed.

Effect of Molybdophosphoric Acid on Thermal Layer Growth on InP

Thermal layer growth on InP in the presence of molybdophosphoric acid (MPA) is studied. An activator added to the system enhances phosphate formation compared to InP thermal oxidation in the absence of H7[P(Mo2O7)6] · nH2O.