Abstract
Spinel metal oxides, prepared at high temperature, have shown excellent gas sensing properties among metal oxide sensing materials. Herein, a series of porous spinel gallate nanospheres, including CdGa_2O_4, NiGa_2O_4, CoGa_2O_4, CuGa_2O_4, ZnGa_2O_4, and MgGa_2O_4 were prepared by solvothermal method and followed low temperature calcination. XRD, SEM, XPS and N_2 adsorption-desorption have been carried out to determine their structure, morphology, chemical state and surface area, respectively. These nanospheres are all composed of tiny nanoparticles, giving meso-porous characters. Furthermore, the sensor based on CdGa_2O_4 exhibits excellent formaldehyde sensing performance, including good selectivity, short response time, and excellent stability at the low working temperature of 120 °C.
NSTL
Elsevier