Carbon monoxide gas sensing properties of SnO2 modified metal-organic skeleton derived NiO

Carbon monoxide (CO), as a characteristic gas of transformer faults, its accurate detection is crucial for the stable operation of power systems. In this paper, a high-precision CO sensor based on MOF-derived nickel oxide/tin dioxide ( MOF-NiO/SnO2) capable of operating at room temperature was prepared. Characterization results show that lamellar MOF-derived NiO with large specific surface area can be used as an attachment platform for SnO2 nanoparticles, which contributes to the formation of heterojunctions and the realization of high-performance synergies. This allows the sensor to exhibit excellent response values for CO gas sensing (5.48 @100 ppm CO gas), low detection limits (1 ppm CO gas) and fast response/recovery times (56/4 s @ 100 ppm CO gas). The porous structure, large specific surface area of MOF-derived NiO and formation of NiO/SnO2 heterojunction realizes high performance CO gas detection at room temperature.