General synthesis of porous spinel gallate nanospheres for selective and quick detection of formaldehyde

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 CdGa2O4, NiGa2O4, CoGa2O4, CuGa2O4, ZnGa2O4, and MgGa2O4 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 CdGa2O4 exhibits excellent formaldehyde sensing performance, including good selectivity, short response time, and excellent stability at the low working temperature of 120 degrees C. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

Porous spinel gallate nanospheres prepared by solvothermal method and low temperature calcination exhibit excellent gas sensing properties, with CdGa2O4 nanospheres showing outstanding formaldehyde sensing performance at 120 degrees Celsius.