In this paper, we report on the successful fabrication of β-Ga2O3 thin films by spray-pyrolysis technique. We provide the data on the dependence of the quality of the β-Ga2O3 films on the regimes and parameters of fabrication. Scanning electron microscopy, atomic force microscopy and optical spectroscopy are used to analyze film properties. X-ray diffraction phase analysis of the films after heat treatment at 900°C confirms the formation of β-Ga2O3 crystallites.

Nowadays, gallium oxide (Ga2O3) as a wide bandgap semiconductor material is acquiring more and more attention in various practical areas. As a result, there has been a lot of efforts to fabricate and study bulk Ga2O3 material, Ga2O3 thin films, and Ga2O3 nanowires. For Ga2O3 films, there exists a variety of preparation methods such as metal-organic chemical vapor deposition, hydride vapor phase epitaxy, pulsed laser deposition, molecular beam epitaxy, frequency magnetron sputtering, atomic layer deposition, wet chemistry, and sol-gel. This concise review focuses on the preparation of Ga2O3 thin films by sol-gel methods. Sol-gel methods include dip-coating, spin-coating, spray pyrolysis, and drop casting technique. The details on the fabrication of β-Ga2O3 thin films by sol-gel method are summarized and prospected. Polymorphism, structure and properties of sol-gel prepared Ga2O3 films are discussed.

Continuous monitoring of patient’s state in intensive care units is crucial for displaying critical conditions and identifying signs of clear consciousness. Traditional monitoring on a bedside monitor represents digital value on the screen and has several shortcomings. The observer’s perception of digital information is limited by visual acuity and affects the speed of decision-making. The radio frequency range is increasingly overloaded with the development of Internet of Things devices. It leads to numerous errors in the transmitted data. The developed system is aimed at the comprehensive elimination of the shortcomings through available means. An understandable visualization system is preferred for prompt recognition of changes in the patient’s state, increasing the speed of perception of the observer, and receiving information in the form of a data set. A data transmission system via optical wireless communication is relevant for duplicative channel for displaying and eliminating the shortcomings of systems operating in the radio frequency range. The system being developed is universal and can be used in a wide range of professional fields. In particular, if the use of the radio frequency range is limited and the stability of the data transmission channel to electromagnetic interference is essential.