metal oxide sensors

Metal oxide sensors detect gases by measuring changes in electrical resistance of a metal oxide material, such as tin oxide, when it interacts with gas molecules. When these gases contact the sensor surface, they either donate or accept electrons, altering the material’s conductivity. This change is then translated into an electrical signal, indicating the presence and concentration of specific gases. These sensors are widely used for air quality monitoring, industrial safety, and medical diagnostics because they are sensitive, reliable, and relatively inexpensive.