The fabrication and triethylamine sensing performance of In-MIL-68 derived In_2O_3 with porous lacunaris structure

摘要

Gas sensors with high sensitivity, selectivity, stability, moisture resistance and reliable fabrication potency for detection of toxic and harmful gases have been now expected for many applications in the environment. Herein, a kind of triethylamine (TEA) gas sensors can quantitatively detect on ppb level gases is reported. The sensors were fabricated with porous lacunaris structure In_2O_3 derived from metal-organic frameworks In-MIL-68 by annealing at a suitable temperature 500 °C. It exhibited the highest response of 32 when exposed to 100 ppb TEA gas at the optimal operation temperature 120°C, and the response and recovery time is 9 s and 36 s respectively. Furthermore, it also demonstrated outstanding selectivity, stability (without any change after 40 days) and moisture resistance (kept 86.2 % response at 90 % relative humidity). In addition, the good response linearity within a wide TEA concentration range of 0.1 ppm-5 ppm and lower detection limit are other advantages of the sensor. Considering these advantages, In-MIL-68 derived In_2O_3 sensor is a promising candidate for TEA detection. The gas sensing mechanism is also explored here.