Study of Nanostructured Metal Oxide Semiconductor Based Gas Sensors for Toxic Gas Detection

In this modern era, there are different instruments available to monitor pollutants and dangerous gases, but they are time-consuming, expensive, and hardly employed in real-time environments. To detect gas components, numerous metal oxide semiconductor gas sensors have been developed during the past century using a variety of materials and methods. In recent years, there have been significant rises in the number of sensors that can identify different gases, particularly with regard to issues relating to the earth's atmosphere and global environmental issues. These issues have made it necessary to use gas sensors that can identify air pollutants like NOX, SOX gases. This paper presents the survey on different sources of pollution, various gas sensors and different ways to enhance sensitivity and selectivity of gas sensor.