From Relative Hydrophobic and Triethylamine (TEA) Adsorption Preferred Core-shell Heterostructure to Humidity Resistance and TEA Highly Selective Sensing Prototype: An Alternative Approach to Improve the Sensing Characteristics of TEA Sensors

During the detecting of industrial toxic gases, like triethylamine (TEA), poor selectivity and negative humidty impact are still remained challenge issues. A frequently reported strategy is to employ molecular sieves or metal-organic frameworks (MOF) membrane so that interference derived from surrounding gases or water vapor can be blocked. Nevertheless, the decline in response signal was also observed after coating these membranes. Herein, an alternative strategy that based on the hydrophobic, TEA adsorption preferred p-n conjunction core-shell heterostructure is proposed and is speculated to simultaneously enhance selectivity, sensitivity and humidity resistance. To verify the practicability of the proposed strategy, a thickness tunable nitrogen-doped carbon (N-C) shell coated α-Fe2O3 nano olives (N-C@α-Fe2O3 NOs) based core-shell heterostructure that obtained via a unique all-vapor-phase processing method is selected as the research example. After forming the core-shell heterostructure, relative hydrop...