The room temperature ethanol gas sensors based on MoS₂-CuGaO₂ composite prepared by hydrothermal method

In this paper, MoS₂-CuGaO₂ composites were successfully synthesized by hydrothermal method. The composites were characterized by X-ray diffraction (XRD), Scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FTIR), X-ray photoelectron spectroscopy (XPS), respectively. The specific surface area and pore size distribution were obtained by N₂ adsorption-desorption isotherms. The gas sensing property measurements were conducted. The sensitivity of pure CuGaO₂ based gas sensor to 100 ppm acetic acid and benzene vapor was 1.4 at 25^oC. The sensitivity of MoS₂-CuGaO₂ composite (M - 5) was 6.0 towards 100 ppm ethanol vapor at 25^oC. And the detection limit of MoS₂-CuGaO₂ (M - 5) based sensor was 0.1 ppm. The results demonstrated that MoS₂ had effect on the selectivity and sensitivity of the MoS₂-CuGaO₂ composites. M - 5 composite is considered to be promising for ethanol sensing application in room temperature.