Mof-Driven Α-Fe2o3 with Hollow Microstructures and Oxygen Vacancies for High-Performance Triethylamine Sensing

Abstract

Recently, the metal-organic frameworks (MOF)-derived material has garnered increasing attention for its exceptional gas-sensing performance. Herein, by utilizing MIL-88A (Fe) as a precursor, hollow ship-like α-Fe2O3 with oxygen vacancy defects was successfully synthesized through a simple calcination method. According to the characterization results, α-Fe2O3 exhibited a porous structure composed nanoparticles, featuring a rough surface. Notably, under the optimum operating temperature of 180 °C, the sensor based on α-Fe2O3 exhibited admirable gas-sensing properties for trimethylamine (TEA), including an ultra-high response (527 at 50 ppm), a rapid response/recovery time (20/8 s at 2 ppm), and good selectivity. These outstanding TEA-sensing performances were can be attributed to the unique structures and suitable defects, suggesting that this research will be advantageous for the development of high-performance gas sensors for TEA.

Keywords: Gas sensor, MOF-derivate, α-Fe2O3, Hollow and porous structure, Oxygen vacancy defect