High acetic acid sensing performance of Mg-doped ZnO/rGO nanocomposites

Mg-doped ZnO/reduced graphene oxide (rGO) nanocomposites were synthesized using a facile and cost-effective sol-gel procedure to detect acetic acid vapor. Field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), ultraviolet-visible (UV–vis) diffuse reflectance spectroscopy, and photoluminescence (PL) analysis were utilized to characterize morphologies, compositions of the nanocomposites, and optical properties of the synthesized nanostructures. The gas sensing measurements of spin-coated Mg-doped ZnO/rGO thin films were carried out for a temperature range of 150–350?°C at various acetic acid vapor concentrations. It was found that the Mg-doped sample with 20?wt%/v of GO solution concentration exhibited the response/recovery time of 60?s/35?s with the best response of ~?200% for 100?ppm of acetic acid at 250?°C.