Layer by layer Self-assembled MoS2-ZnO Heterostructure for Near Room Temperature NO2 Gas Sensor

Due to their excellent chemical and electronic properties, two-dimensional MoS2 has emerged as a viable candidate for developing room temperature NO2sensors. However, the MoS2-based gas sensor suffers from low sensitivity and incomplete recovery. Therefore, in this work, we fabricate and characterize layer-by-layer self-assembled MoS2-ZnO heterostructure for near-room temperature NO2gas sensor. The results reveal that MoS2 -ZnO heterostructure exhibits high response and complete recovery for NO2gas with the excellent cross-sensitivity against CO, CO2, NH3 and SO2 gases. Moreover, the long-term durability of the sensor is evident from the stable response curves even after 15 days. Further, the MoS2 -ZnO heterostructure sensor exhibits the room temperature response and recovery times of around 2.1 min. and 27.9 min., respectively, for 50 ppm NO2gas with the lowest detection limit of about 1 ppm.