Abstract
In order to solve issues of air pollution, to monitor human health, and to promote agricultural production, gas sensors have been used widely. Metal oxide semiconductor (MOS) gas sensors have become an important area of research in the field of gas sensing due to their high sensitivity, quick response time, and short recovery time for NO2, CO2, acetone, etc. In our article, we mainly focus on the gas-sensing properties of MOS gas sensors and summarize the methods that are based on the interface effect of MOS materials and micro–nanostructures to improve their performance. These methods include noble metal modification, doping, and core-shell (C-S) nanostructure. Moreover, we also describe the mechanism of these methods to analyze the advantages and disadvantages of energy barrier modulation and electron transfer for gas adsorption. Finally, we put forward a variety of research ideas based on the above methods to improve the gas-sensing properties. Some perspectives for the development of MOS gas sensors are also discussed.
Highlights
In order to solve issues of air pollution, to monitor human health, and to promote agricultural production, gas sensors have been used widely
The nanofiber structure was beneficial for ethanol molecule conduction and improved the rateat fiber structure was beneficial for ethanol molecule conduction and improved the rate at which carriers passed through the barriers
We summarized the advantages and disadvantages of Metal oxide semiconductor (MOS) nanomaterials and introduced the main gas-sensing properties of MOS gas sensors
Summary
The gas-sensing properties of MOS gas sensors are evaluated by the response [15], selectivity [17], and stability [25]. Response represents the ability of gas sensors to detect target gas concentrations [26]. Response is expressed as the ratio of Ra and Rg, or the change in Ia and Ig [29]. The response is described as the change in currents in the target gas to air for FET [30]. Selectivity is the ability of the gas sensors to detect one or more target gases in a mixture of gases [25,31]. There is recovery time, response time, and LOD (limit of detection, which expresses the smallest concentration of the target gas)
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