Preparation and gas-sensing properties of WS₂/CuGa₂O₄ composite materials

CuGa2O4 nanomaterials were synthesized by the co-precipitation method, and a series of WS2/CuGa2O4 composite materials were prepared by the hydrothermal method. The crystal phase, morphology, and chemical state of the as-prepared materials were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and so on. The effect of the doped amount of WS2 on the gas-sensing sensitivity of CuGa2O4 materials to ethanol gas was studied. The results showed that when the mass ratio of WS2 to CuGa2O4 was 1%, the response of this gas sensor to 100 mu L center dot L-1 ethanol gas at room temperature was 345.3, and the response and recovery times were 184 and 69 s, the detection limit reached 0.1 mu L center dot L-1.