Bimetallic Ni/V-MOFs-derived Ni3V2O8@NiO hollow microspheres for ultrasensitive detection of triethylamine

Metal-organic frameworks (MOFs)-derived metal oxides are characterized by high porosity, large specific surface area, controllable composition, and tunable pore size, which make them have good potential as gas sensing materials. In this paper, Ni 3 V 2 O 8 @NiO hollow microspheres derived from bimetallic Ni/V-MOFs were synthesized using a three-step method (solvothermal method, cation-exchange method, and annealing process). XRD, Raman, SEM, TEM, XPS, and BET techniques were employed to investigate the structure, morphology, specific surface area, pore size distributions, elemental composition, and chemical state of Ni 3 V 2 O 8 @NiO composites. Gas sensing performance studies showed that the NV@NiO-2 sensor exhibited higher response (43.7) to 100 ppm triethylamine at a lower operating temperature (240℃), shorter response/recovery time (88 s/127 s), higher selectivity, lower detection limit (4.5 ppb), and better repeatability. In addition, the NV@NiO-2 sensor exhibited a strong linear relationship (R 2  = 0.996) between response and gas concentration across a range of 1–100 ppm. The present work serves as a valuable reference for the preparation of triethylamine sensing materials with high specific surface area, high porosity, high response and high selectivity.