The metal–silicon thin-film system is not isostructural and furthermore exhibits pronounced interdiffusion and chemical reactions. Therefore the growth of metallic films on silicon leads to a nanosize nonhomogenity o...
详细信息
The metal–silicon thin-film system is not isostructural and furthermore exhibits pronounced interdiffusion and chemical reactions. Therefore the growth of metallic films on silicon leads to a nanosize nonhomogenity of films and a high concentration of defects, especially at interface. The material also contains stressed transition layer, which can contain alloys and/or compounds (silicides). We have considered theoretical viewpoints and reviewed experimental data on the growth and properties of metallic nanofilms (including multilayered ones) on silicon, and also provided a brief review of their applications. The films consist either of atomic-sized, quabquantum sized and quantum sized layers. We have suggested a low temperature film growth technology based on freezing growing layers during deposition by maintaining a low temperature of the substrate and using an atomic beam with a reduced heat power. The technology uses a specially shaped deposition system in which the distance between the source and the substrate is comparable to their size or smaller. Furthermore, we use a special time sequence of deposition that provides for a reduced substrate surface temperature due to greater intervals between deposition pulses. This growth method of atomically thin films and multilayered nanofilms excludes interdiffusion between the layers, reduces three-dimensional growth rate and relatively increases lateral layer growth rate.
Temperature influence on optical and structural properties of nanocomposite structures based on cadmium sulfide quantum dots in silicate matrix was investigated. The mechanism of occurrence of reversible laser-induced...
详细信息
This paper describes a features of development and using of interuniversity scientific and educational network «Synergy» for training of engineers in the field of automation, robotics and mechatronic systems...
详细信息
Donut-shaped laser radiation, carrying orbital angular momentum, namely optical vortex, was recently shown to provide vectorial mass transfer, twisting transiently molten material and producing chiral micro-scale stru...
Donut-shaped laser radiation, carrying orbital angular momentum, namely optical vortex, was recently shown to provide vectorial mass transfer, twisting transiently molten material and producing chiral micro-scale structures on surfaces of different bulk materials upon their resolidification. In this paper, we show that nanosecond laser vortices can produce chiral nanoneedles (nanojets) of variable size on thin films of such plasmonic materials, as silver and gold films, covering thermally insulating substrates. These results suggest optical interference of the incident and reflected laser beams as a source of complex surface intensity distributions in metal films, possessing spiral components and driving both center-symmetric and spiral thermocapillary melt flows to yield in frozen nanoneedles with their pre-determined spiral nanocarving.
Given the ubiquitous nature of infrastructure networks in today's society, there is a global need to understand, quantify, and plan for the resilience of these networks to disruptions. With the development of tran...
详细信息
The paper presents the method for processing of excitation-emission matrix of sea water and the allocation of the spectral characteristics of different types of colored dissolved organic matter (CDOM) and phytoplankto...
详细信息
The effect of electrostatic field on optical properties of silicate nanocomposite with cadmium sulfide quantum dots was investigated. It was found that the electrostatic field causes quantum dot orientation along the ...
详细信息
The effect of electrostatic field on optical properties of silicate nanocomposite with cadmium sulfide quantum dots was investigated. It was found that the electrostatic field causes quantum dot orientation along the field force lines leading to changes in the polarized components of the luminescence spectrum. The influence of field force line direction on photoinduced absorption characteristics arised from λ = 405.9 nm laser radiation exposure to nanocomposite was shown.
New approach to organize fluorescent sensor system for determination of metal ions in aqueous solutions was presented. The approach is based on modification of hydrophilic polymer with sensitive fluorescent indicators...
详细信息
New approach to organize fluorescent sensor system for determination of metal ions in aqueous solutions was presented. The approach is based on modification of hydrophilic polymer with sensitive fluorescent indicators. Possibility to register Cu2+ ions by analyzing of luminescence excitation spectra and lifetimes of the sensitive coating is presented.
Using numerical experiment two-dimensional unsteady processes of heterogeneous combustion in porous objects under free convection have been investigated. Combustion is due to the exothermic reaction between the fuel i...
Using numerical experiment two-dimensional unsteady processes of heterogeneous combustion in porous objects under free convection have been investigated. Combustion is due to the exothermic reaction between the fuel in the porous solid medium and oxidizer contained in the gas flowing through the porous object. In considered porous objects the gas pressure at object permeable boundaries is known but the flow rate and velocity of the gas at these boundaries are unknown, so the flow rate of oxidant, which enters into the reaction zone in porous object, regulates itself. Various objects with combustion zones resulting from natural and man-made disasters (in particular, peatlands, coal dumps, landfills) can be modeled, in terms of mechanics, as such porous objects. An original numerical method, based on a combination of explicit and implicit finite-difference schemes, is used for investigating the two-dimensional time-dependent combustion waves in considered porous objects. It has been revealed that when the natural convection takes place, the vortex-type gas flows can occur in the combustion zone and in its vicinity. It has been revealed that sometimes the complex gas flows within the porous object under natural convection are able to restrict the oxidant supply into the combustion zone and to extinguish the fire.
暂无评论