In this work, a broad overview in the field of strontium titanate (ST, SrTiO3)-, barium titanate (BT, BaTiO3)- and barium strontium titanate (BST, BaSrTiO3)-based gas sensors is presented and discussed. The above-mentioned materials are characterized by a perovskite structure with long-term stability and therefore are very promising materials for commercial gas-sensing applications. Within the last 20 years, the number of papers where ST, BT and BST materials were tested as gas-sensitive materials has ten times increased and therefore an actual review about them in this field has been expected by readers, who are researchers involved in gas-sensing applications and novel materials investigations, as well as industry research and development center members, who are constantly searching for gas-sensing materials exhibiting high 3S parameters (sensitivity, selectivity and stability) that can be adapted for commercial realizations. Finally, the NO2-sensing characteristics of the BST-based gas sensors deposited by the authors with the utilization of magnetron sputtering technology are presented.

Controlling environmental pollution is a burning problem for all countries more than ever. Currently, due to the increasing industrialization, the number of days when the limits of air pollutants are over the threshold levels exceeds 80–85% of the year. Therefore, cheap and effective sensors are always welcome. One idea is to combine such solutions with cars and provide real-time information about the current pollution level. However, the environmental conditions are demanding, and thus the developed sensors need to be characterized by the high 3S parameters: sensitivity, stability and selectivity. In this paper, we present the results on the heterostructure of CuO/SnOx and SnOx/CuO as a possible approach for selective NO2 detection. The developed gas sensors exhibited lower operating temperature and high response in the wide range of NO2 and in a wide range of relative humidity changes. Material characterizations and impedance spectroscopy measurements were also conducted to analyze the chemical and electrical behavior.

Measurements of the properties of gas-sensitive materials are a subject of constant research, including continuous developments and improvements of measurement methods and, consequently, measurement set-ups. Preparation of the test set-up is a key aspect of research, and it has a significant impact on the tested sensor. This paper aims to review the current state of the art in the field of gas-sensing measurement and provide overall conclusions of how the different set-ups impact the obtained results.

No abstract

The evolution of teaching methods concerned with electrical engineering enables the development of new measurement stands or the improvement of existing educational methods. The advancement in engineering equipment is affecting the formation of new methodologies in teaching. Nevertheless, new educational techniques should be implemented by taking into account understanding of a physical basis of studied phenomena. This goal may be achieved via a combination of practical exercises conducted on testing stands, during evaluation, by means of modern computerized tools. In this paper, we described the combination of a numeric study of electric field (EF) distribution and an improved analog method analysis performed on an educational set‐up. For an effective understanding of technical problems of high‐voltage (HV) and medium‐voltage technology, the presented educational tool combines an experimental method of EF equipotential line mapping and EF strength determination with an improved analog method of EF strength inside the HV insulation system, which is determined by means of differential equation calculation implemented on the developed software. For fast verification of the results, computer simulations were applied. It allows for presenting the strong and weak points of both used methods. Analyzed models reproducing real devices were built on different scales; thus, achieved results reflect the real values and may be used for study help during seminars.