Portable H2S gas detection and alert system prototype using highly sensitive nanocrystalline SnO2 thin films : Sensor for environmental monitoring

Portable, compact and hand held electronic alarm which can detect H
2
S gas at room temperature from 1 ppm to 10 ppm is fabricated using nanostructured SnO
2
thin film deposited on quartz using Langmuir Blodgett technique. In order to evaluate the reliability of the H
2
S detection and alert system, few such sensors were studied for extracting the sensitivity, selectivity and accuracy parameters of the sensor under various environments such as, in presence of other gases and light intensity conditions. Using the optimized parameters an electronic alarm with less than 5 V input power requirement was fabricated. Along with 3D printed light weight gas sensor housing, overall alarm system is a hazard free, compact, reliable and versatile detection and alert system.