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

Abstract In this work, we studied the synthesis and sensing performance of RGO-MoS 2 -CdS nanocomposite films serving as the sensing layer. By a facile solvothermal treatment, CdS nanocones could be grown on the 2D layered RGO-MoS 2 substrate to form a new heterostructure. Importantly, the gas sensor based on RGO-MoS 2 -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 NO 2 , about 7 times higher than the value of RGO-MoS 2 based gas sensor. Moreover, the gas sensor presented an outstanding selectivity toward NO 2 gas against the other gases, which was of great significance in both environmental protection and human health.