Sensing of hazardous gases is one of the most significant challenge in front of humans in this technological era, because degradation of eminence air, due to emission of diverse air contaminants by urbanization activities, is increasing day by day. There is an urgent global demand of advanced materials with enhanced sensing features for monitoring the pollutants to prevent the environmental deterioration. Recently, two-dimensional (2D) molybdenum disulfide (MoS2) and its nanostructured materials have gained enormous attention in gas sensing applications because of their novel semiconducting properties with sizeable bandgap, abundant reactive sites and large specific areas. This review summarizes the systematic depiction of gas sensors based on 2D MoS2 and its nanostructures with their structure, morphology and sensing properties. Diverse configurations and gas sensing mechanism, influence of various parameters on the performance of gas sensors based on MoS2 are elucidated. In addition, the gas sensing performance of pristine MoS2 and its derivatives are discussed to further enhance the sensing performances of these devices. Moreover, performance of light assisted of the MoS2 based devices are also summarized. Finally, the existing key challenges which hinder the advance development and practical applications of MoS2 based gas sensors are proposed for future perspectives. (C) 2022 The Electrochemical Society ("ECS"). Published on behalf of ECS by IOP Publishing Limited.
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