Synthesis and Characterization of Ba0.5Sr0.5TiO3 Nanoparticles for Ethanol Vapor Sensing Applications

The study reports on the preparation of nanocrystalline Ba_0.5Sr_0.5TiO₃ using the sol-gel method and the characterization of its morphological, and gas sensing properties. X-ray diffraction analysis confirmed the cubic structure of Ba_0.5Sr_0.5TiO₃, with a crystallite size of approximately 54 nm. Scanning electron microscopy was employed to examine the material's morphology. The sensor fabricated from these nanocrystalline Ba_0.5Sr_0.5TiO₃ demonstrated high sensitivity and rapid response/recovery to ethanol at 300 °C. The sensitivity reached up to 59.23% when exposed to ethanol concentrations ranging from 50 to 200 ppm. A linear relationship between sensitivity and ethanol concentration was observed within the 50-200 ppm range. Thus, the findings suggest that nanocrystalline Ba_0.5Sr_0.5TiO₃ is a promising material for high-performance ethanol sensors.