Hydrothermal Fabrication of Ag-Decorated MoSe₂/Reduced Graphene Oxide Ternary Hybrid for H₂S Gas Sensing

Abstract

This paper demonstrates a H2 S gas sensor based on Ag-MoSe2/reduced graphene oxide (rGO) ternary composite material via hydrothermal method was studied. The microstructures, morphologies and compositional characteristics of the Ag-MoSe2/rGO nanocomposite were completely tested by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscope (TEM) and energy dispersive spectrometer (EDS). By exposing it to various concentrations of H2 S gas from 0.1 ppm to 30 ppm at room temperature, the gas sensing properties of the Ag-MoSe2/rGO sensor were examined. The experimental data indicated that the H2 S gas sensor has a high response, quite response-recovery performances, excellent selectivity and reproducibility toward H2 S gas. Moreover, the work also investigates the effect of Ag loading in the compound on the H2 S gas sensing. The sensing mechanism of the Ag-MoSe2/rGO film sensor can be attributed to the modulation of potential barrier with electron transfer and the synergistic effect of the ternary compound nanostructures. This paper shows that in diverse applications, the prepared Ag-MoSe2/rGO composite is a potential candidate for detecting H2 S gas at room temperature.