Abstract
Volatile gas of triethylamine (TEA) may cause serious pollution to the environment and have a great impact on the respiratory system. Once inhaled into the lungs, it can cause pulmonary edema and even death. According to Occupational Safety and Health Administration (OSHA) regulation, the concentration of TEA allowed in air is limited to 10 ppm. Herein, we reported a TEA gas sensor, it can quantitatively detect on ppb level based on metal-organic frameworks-derived In2O3 hollow porous structure, which was successfully synthesized by calcinating the precursor In-MIL-68 at a suitable temperature 500˚C, and exhibited the highest response of 226 when exposed to 5 ppm TEA gas at the optimal working temperature 120˚C. Furthermore, In2O3-500 sensor not only possessed superior response and recovery properties of 9 s and 36 s under 5 ppm TEA gas, respectively, but also demonstrated outstanding selectivity, stability and moisture resistance. In addition, the In2O3-500 sensor exhibited the good response linearity within a wide TEA concentration range from 100 ppb to 5 ppm, and lower detection limit. Considering the superiority including facile fabrication, low cost and simple structure, In2O3-500 hollow porous structure is a promising candidate for high-performance TEA sensing applications. key words: Gas sensor, Triethylamine , In2O3, Metal-organic frameworks Figure 1
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