Abstract The application of nanotechnology has brought about a revolution in the field of gas sensing by making it possible to create new materials that possess sensitivity, selectivity, and functionality that are unmatched. SrSnO₃ and BaSnO₃ The emergence of nanostructures as major participants in this change has resulted in the provision of considerable benefits in comparison to conventional bulk materials. The improved surface area-to-volume ratios, customized electrical characteristics, and good thermal stability that these perovskite oxides possess make them great candidates for applications in the field of gas sensing. This study focuses on the synthesis of SrSnO₃ and BaSnO₃ the formation of nanostructures by the use of processes such as hydrothermal, co-precipitation, and sol-gel procedures. It is possible to produce high-performance nanostructures by the use of the sol-gel process, which offers great control over the particle size and purity. Despite the fact that it is less complicated and more scalable, co-precipitation only achieves modest phase purity and uniformity, which means that it has to be optimised for use in industrial applications. A material with excellent gas adsorption and stability may be produced using hydrothermal synthesis, which allows for exact control over the shape and particle size of the material. The gas-sensing capabilities of these materials are further improved by the use of nanostructuring in conjunction with chemical doping techniques. In addition to enhancing electrical conductivity and allowing for the selective detection of particular gases, rare earth and metal oxide dopants are responsible for the creation of oxygen vacancies. One example is, doped SrSnO₃ and BaSnO₃ nanostructures have demonstrated excellent performance in detecting gases like NO₂, CO, and methane, making them invaluable in industrial, automotive, and environmental monitoring. There are promising future prospects for increasing the synthesis capacity of these nanostructures to fulfill market demands. Wearable applications and real-time gas monitoring will be made possible by advancements in hybrid material designs, flexible sensors, and systems enabled by the Internet of Things. Resolving issues with integration, scalability, and repeatability SrSnO₃ and BaSnO₃ nanostructures can drive the next generation of gas-sensing technologies, contributing to global safety and environmental sustainability. Keywords: Nanotechnology, SrSnO₃, BaSnO₃, gas sensors, sol-gel synthesis, industrial applications.