Preparation of core-shell nanospheres and study of their gas-sensitive properties

Spineloxides with AB2O4 molecular formula units represent a promising sensing material. The metal-organic frameworks (MOFS) were adopted as the template, with a simple one-step solvothermal method and annealing, ZnO/ZnCo2O4 core-shell nanospheres were synthesized, and Ag particles were doped on its surface through a deposition process. The samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM). The response of the Ag- ZnO/ZnCo2O4 material to 100 ppm methanol gas was higher than that of the ZnO/ZnCo2O4 material, and the modification of surface Ag particles could improve the gas sensitivity of ZnO/ZnCo2O4 core-shell nanospheres’ sensitivity.