Gas Sensor and Sensitivity

Abstract

Gas sensors help to detect toxic and flammable gases in the atmosphere, and the use of these devices can reduce or prevent severe consequences for people and the environment. Metal oxides are one of the best materials used in the preparation of gas sensors, and they have proven in general that they have resistance to high temperatures Also, they are characterized by optical transparency at visible wavelengths, and they have a wide band gap. Whereas the interactive properties of metal oxides are the applications key chemical sensor. One of the characteristics of sensitivity is sensitivity, which is defined as the rate of change in the resistance of the thin film in the presence and absence of gas. Sensitivity is affected by several factors, including the relative humidity, the temperature of the sensors, the response time of the sensitivity, the time of exposure of the membranes to the gas, the background of the gas composition, and the thickness of the film.The chapter includes an explanation of the sensor parts and measurement sensitivity.