Abstract
In this study, the mesoporous NiCo2O4 microspheres with abundant oxygen vacancies were prepared through a concise solvothermal-calcination method. The result revealed that the mesoporous 500-NiCo2O4 sensor showed a high gas sensing response of 16.7 to 100 ppm xylene, and rapid response-recovery process and long-term stability. These can be attributed to the synergistic effect between mesoporous structure and oxygen vacancy, which not only facilitated the gas adsorption–desorption process but also offered more active sites to ionize more oxygen species, leading to an efficient gas sensing reaction.
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