ZIF-67 MOF-derived Co3O4/NiCo2O4/CC unique layered structure with excellent gas performances

In this work, the synthesized Co3O4/NiCo2O4/CC is a layered structure, which was prepared by a feasible method of hydrothermal reaction, thermal annealing of ZIF-67 template and other thermal treatment. This novel structure is based on carbon cloth, and Co3O4 hollow nanocubes as semiconductor material grow in situ on nanowire arrays. Under the condition of different temperatures and different concentrations of ethanol, the response of the gas sensor based on Co3O4/NiCo2O4 was studied. The result shows high sensitivity, good linear relationship and excellent response-recovery properties. And its high sensitivity is demonstrated with a maximum response up to 35 at 180 degrees C and 200 ppm. The sensor performs well in gas sensitivity thanks to the structure of the material. Large specific surface area, high porosity and fast electronic transport channel between Co3O4 and CC are all important reasons. Accordingly, this method of preparing the novel hierarchical structure can improve the gas sensitive performance. This work would provide a reference for further research on the application of Co3O4 MOF-derived structure in gas sensitive.