LAUSR

Abstract Molybdenum disulfide (MoS 2 ) has sparked immense interests as a novel gas sensing material due to its inherent layered structure and large surface-to-volume ratio. However, the obstacles of insufficient sensitivity and poor recoverability for MoS 2 -based gas sensors need to be resolved for the further applications. Herein, we report the construction of MoS 2 nanosheets based p–n heterostructures for the purposes of achieving excellent NO 2 detection at room temperature. After functionalized with tin oxide (SnO 2 ) nanoparticles, the optimal MoS 2 /SnO 2 heterostructure-based gas sensor exhibits a response of 18.7 to 5 ppm nitrogen dioxide (NO 2 ), an outstanding selectivity compared with other gases, and an excellent long-term stability for 4 weeks. The enhanced sensing performance of MoS 2 /SnO 2 heterostructures can be ascribed to the unique 2D/0D nanostructures and the formation of numerous p–n heterojunctions. Therefore, construction of p–n heterostructures provides a versatile solution to overcome the sensing issues of MoS 2 -based gas sensors and also paves a new way for others room temperature sensor applications.