Enhanced triethylamine sensing performance of metal-organic framework-derived nest-type Fe-doped NiO nanostructure
Up to now, most of the triethylamine gas sensors showed long recovery time and poor stability, which is not conducive to the application of the TEA sensor. Therefore, it is necessary to produce the TEA sensor with high response value and fast response recovery speed. In this work, we have prepared the unique nest-type Fe-doped NiO by facile hydrothermal reaction with annealing process. The 0.52at%Fe-doped NiO based on sensor showed significantly improved triethylamine gas performances compared with the pure NiO sensor. At the optimum operating temperature of 260C, the response value to 50 ppm TEA up to 64, which was about 21 times higher than the pure NiO sensor, exhibitted quickly response (26s) and recovery time (5s), lower detection limit, good selectivity and stability. The fast recovery time (5s) compensated the disadvantage for most of the TEA sensors and combined with high response value, which indicated that as-prepared the nest-type Fe-doped NiO can be used as an ideal material for the effective detection of TEA. At last, the growth mechanism and improved gas sensitivity mechanism of the Fe-doped NiO was explored in detail.