A novel RGO-MoS2-CdS nanocomposite film for application in the ultrasensitive NO2 detection

In this work, we studied the synthesis and sensing performance of RGO-MoS2-CdS nanocomposite films serving as the sensing layer. By a facile solvothermal treatment, CdS nanocones could be grown on the 2D layered RGO-MoS2 substrate to form a new heterostructure. Importantly, the gas sensor based on RGO-MoS2-CdS films, with the higher specific surface area, more adsorption sites and lots of heterojunctions, showed a largely enhanced sensor response of 27.4% toward 0.2 ppm NO2, about 7 times higher than the value of RGO-MoS2 based gas sensor. Moreover, the gas sensor presented an outstanding selectivity toward NO2 gas against the other gases, which was of great significance in both environmental protection and human health.