Table of contents

The special issue of the Vladimir State University based on results of the 8th International Conference "Modern nanotechnology and nanophotonics for science and industry" which was held from 9 to 20 November 2020 in Suzdal, Russia.

Journal of physics: Conference series

http://mnnsi.interconf.pro/(Conference website)

Start date: 9th of November 2020

End date: 20th of November 2020

Location: Russia

Number of articles: 20

On-line publishing

The conference was held online due to the COVID-19 issues

Organizers are in Russia, Vladimir, Vladimir State University

To organize the conference, the committee have used the Zoom app.

The status of the conference: International

Zoom application allowed holding the conference without any problems

• All papers published in this volume of Journal of Physics: Conference Series have been peer reviewed through processes administered by the Editors. Reviews were conducted by expert referees to the professional and scientific standards expected of a proceedings journal published by IOP Publishing.

• Type of peer review:Single-blind

• Conference submission management system:The article submission procedure was carried out via a web-form directly to the E-mail of the conference organizers

• Number of submissions received:21

• Number of submissions sent for review:21

• Number of submissions accepted:20

• Acceptance Rate (Number of Submissions Accepted/Number of Submissions Received X 100):95,24

• Average number of reviews per paper:2

• Total number of reviewers involved:2

• Any additional info on review process:Reviewers have made recommendations on the essence of the works and their design through the organizing committee. All of the corrections were carried out before the uploading in IOP system.

• Contact person for queries:Anton Osipov, Vladimir State University, osipov@vlsu.ru

This work has been carried out on the basis of the fundamental areas of optics and electrophysics of topological nanoscale objects with an emphasis on demonstrating the work of the developed prototypes of the corresponding practical devices and on their test tests.

Using well-known methodology perfluorinated sybphthalocyanine (F₁₂^sPcBCl) and hexaphenyltripyrazinosubporphyrazine (Ph6Pyz3sPzBCl) were obtained and further its spectral and base properties have been studied by spectrophotometric titration and fluorescence spectroscopy. By means of spectrophotometric titration sequential protonation of two azomethine bridges was observed with the shifts of the absorption Q bands to 625-665 nm (for F₁₂^sPcBCl), to 584-683 nm and CT (charge transfer) band to 426-453 nm (for Ph₆Pyz₃sPzBCl). The spectral changes in the electronic absorption spectra of F12sPcBCl observed in an acid medium differ significantly compared to Ph₆Pyz₃sPzBCl. Protonation of Ph₆Pyz₃sPzBCl was observed in 0.08-0.35 M solution of trifluoroacetic acid in dichloromethane, in contrast to F₁₂^sPcBCl for which protonation in dichloromethane was observed at TFA concentration equal to 1.34 M. Bathochromic shift of the Q bands in the emission spectra was indicated for each of the protonated forms of the compounds, accompanied by a decrease in the fluorescence intensity with increasing acidity.

The paper is devoted to the study of the possibility of constructing a digital conversion on new optoelectronic principles that will expand the frequency range of the conversion, as well as increase the bit conversion, thereby improving accuracy. The basic configuration options of radiating elements in digital-to-analog conversion systems are considered. Simulation was carried out using the ZEMAX software package. The dependence of the conversion of an input digital signal into an analog signal at a photodetector is investigated.

This article presents the fast and easy way to synthesize tetra-aryl-substituted aza-BODIPY dyes. The standard synthesis technique in solution was modified by mechanochemical solid-state grinding and minimizing the solvent amount. These approaches substantially reduced reaction time. Obtained dyes showed moderate fluorescence in near-infrared window in biological tissue and may be further used in areas of biological sensing.

The composite powders AlMg6 + 0.3 wt.% CNT and AlMg6 + 0.3 wt.% TiC/CNT were synthesized by the method of high-energy ball milling. Characterization of powders was carried out by methods of scanning electron microscopy, granulometric, and X-ray phase analysis. The powders were consolidated by hot pressing. The structural-phase composition and mechanical properties of bulk composites have been studied. The positive effect of the ex-situ TiC layer on the CNT surface on the mechanical properties of composites based on the AlMg6 aluminum alloy is shown.

Controllable transparency level is the key parameter for production of the grayscale masks for the aims of submicron photolithography. In this work, we have developed an analytical model to predict transparency dependencies of the irradiated areas on thin titanium films during laser oxidative treatment. This allows controlling final optical properties of submicron recorded areas by tuning the parameters of laser fluences, initial film thicknesses, and laser wavelengths in the wide ranges. Modelling results were confirmed by experimental investigation and can be used to optimize the recording process by the preliminary planning the required levels of transparency and necessary laser treatment parameters.

The hardness of steel parts after laser treatment depends on a number of factors. In this paper, attention is focused on the surface heating temperature. The aim of the study is to make a reasonable choice of heating temperature. The results of physical modeling are presented. It is established that the temperature of the phase transformation decreases by 150 ... 200 K. This is due to thermal stresses. The kinetics and mechanism of transformation during laser processing affect the formation of the structure. Heating to a temperature 200.250 K below the melting point leads to an increase in hardness by 10-15 HRC units.

The article is devoted to the application of nanostructured TiN/CrN coating for axial cutting tools for metalworking. The technological process of applying this coating, studies of physical, mechanical and tribological characteristics, as well as adhesion and thickness are presented. The results of experiments on metalworking of aluminum alloy and 40X steel for tools with and without coating are presented. The test results showed that TiN/CrN coating increases the durability of cutters by 2.5...2.6 times, drills by 2.1...3.1 times compared to cutting tools made of high-speed steel R6M5 without coating.

The article is devoted to the analysis of the effect of laser surface modification on the hardness and wear resistance of steel SHX15SG used in the manufacture of roller screw mechanisms. Experiments on laser surface modification were performed on the Russian domestic SVAROG-1-5DR laser system. to get the maximum hardness value. When laser processing without melting the surface of steel SHX15SG, the laser radiation power should be in the region of 5 kW, which corresponds to the maximum power for the installation used. The speed of movement of the laser beam relative to the treated surface should be equal to 25 mm/s, and the focal length should be at least 60 mm. In the case of laser treatment with surface reflow, higher hardness values are obtained at a power of 2 kW. Increasing the power of laser radiation to 5 kW leads to a decrease in hardness. In this case, the speed value should be equal to 25 mm/s, and the focal length should be close to 85 mm. When the focal length is reduced to 60 mm, laser treatment no longer causes melting of the surface of the material under study.

In this paper, laser-induced periodic structures are obtained on the surface of SS304 stainless steel when treated with femtosecond laser radiation. The dependence of the period of surface structures on the speed and power of laser radiation treatment is revealed. The wetting angle and the dependence of this angle on the processing speed are determined. It is shown that after femtosecond laser treatment, the surface became more hydrophilic.

Samples of Ag/Au nanocluster/island fractal nanofilms obtained by thermal diffusion deposition from a colloidal solution are presented. Modeling and evaluation of the features of their structure in the approximation of diffusion-limited aggregation are carried out. The evaluation of the scattering characteristics of the study on the model samples in the framework of the Fischer-Burford relation is made.

A model of the influence of thermal factors in the Rayleigh-Benard convection approximation is proposed. The system of equations of the model was solved using the Chorin projection scheme taking into account the correction based on Ri – Chou interpolation.

The results of experimental studies of the production of metal nanoclusters in colloidal solutions are presented. Models based on the Smoluchowski equation for concentrations of nanoparticles of various sizes, as well as a model of cluster-cluster aggregation, are proposed, which can be useful in studying the processes of nanocluster formation in colloidal solutions.

The results of experiments on obtaining and studying the electrical properties of semiconductor films of PbTe are presented, and a model of current-voltage characteristics in the percolation approximation is proposed. The simulation performed qualitatively correctly reflects the current-voltage characteristics of the obtained films.

The areas of modern solid-state lasers application for solving technological problems of materials laser processing are described. The mod composition of laser radiation, which is used in various technological processes of materials laser processing, such as perforation, cutting and welding of materials, and others, are analyzed. The necessity of solid-state lasers functional improvement in terms of increasing the efficiency of their practical use is substantiated. A method for the prospective application of lasers for technological purposes is presented, based on the functional separation of the acting laser pulses of millisecond duration. The results of experimental testing of this method on the basis of a solid-state technological YAG: Nd³ + laser are presented. The results of studies of the efficiency of processing materials with different thermophysical properties by laser pulses with a complex temporal shape are presented. The experiments results are analyzed. Potential areas of promising use of this method are noted.

The article introduces a tunable NIR laser. The tuning process realizes by the dispersion elements placed inside the resonator. Energy parameters depending on the laser operating mode are presented. The possibility of smooth tuning of the fundamental lasing wavelength depending on the rotation parameters of the dispersion element is shown.

The work is devoted to the problem of high-spherical powders synthesis by the method of laser ablation processing of refractory metals. An investigation of interaction of ultrashort laser pulses with titanium in an n-hexane medium has been carried out. The dependence of granules size and dispersion of synthesized micro- and nanoparticles on the parameters and processing conditions, namely, laser radiation energy, scanning speed, working medium and pressure is shown.

Boron dipyrrin (BODIPY) family is one of the most studied collection of fluorophores, many of which are specifically designed for vital medical uses, such as cell imaging. In this research area, near-infrared absorbing and emitting compounds play the key role. Because of their long wavelength of absorption, they can be effectively excited by taking advantage of therapeutic window of human tissues. Herein we report the repeat of the synthesis of two vinylthiophene-substituted derivatives with extended π-electron systems and their computational investigation. Those dyes were prepared starting from methyl-substituted ones via addition reaction of aldehyde-containing thiophene following the literature. Obtained experimental and theoretical data will allow us to design promising tools not only for cell imaging, but also for fluorescent detection of heavy cations via coordination and possibly more.

The work is devoted to the problem of forming micro- and nanoscale elements topologies of high-resolution by means of controlled treatment of material surface with ultrashort laser pulses. The technology of processing thin-film coatings by the method of selective laser ablation is described. The possibility of using a high-voltage electrostatic field for collecting ablation products and preventing their deposition on the surface of formed microstructures is shown.

Hybrid materails with dipyrrin based luminophores are of major interest in different areas of material chemistry, sensors and photovoltaics. Vast variety of the materials with BODIPY motif were synthesized and investigated up to date. Modern trend in the material chemistry is the aimed functionalization of them by immobilizing in their structure an active components. Based on interactions between matrix and dye we can control spectral and photophysical characteristics of hybrid material for tuning practically valuable properties for specific tasks. Presented paper summarize the results of our research group, working in the field of hybrid materials with BODIPY dyes: synthesis, spectral characteristics evaluation and possibilities of practical application investigation. Discussion is focused on the methods of synthesis of materials and practical application of them as sensors for pH, polarity and in OLED devices.