2D MOF-Based Filtration-Sensing Strategy for Trace Gas Sensing Under Intense F-Gas Interference at Room Temperature

Abstract

The detection of trace impurity gases in fluorinated gas (F-gas) that are widely used in the industry offers a significant avenue for equipment status monitoring and mitigating unnecessary emissions. However, the formidable electron affinity (EA) and adsorption propensity of F-gas molecules render the identification of trace impurities within a high-concentration F-gas atmosphere exceptionally challenging. Herein, the filtration-sensing strategy is proposed to realize highly sensitive and selective Room Temperature (RT) sensing of trace gases in the F-gas environment. Through the innovative construction of a bilayer structure, comprising Co₃(HITP)₂ as the overlayer and SnO₂ nanofibers (NFs) as the sensing layer, remarkably sensitive detection of trace impurity gases under intense F-gas interference conditions is achieved. The efficacy of the Co₃(HITP)₂ overlayer is further corroborated through the incorporation of Pd-SnO₂ and MoS₂-SnO₂ sensors, concurrently facilitating targeted quantitative identification within a complex gas mixture environment. The underlying sensing mechanism is predominantly attributed to interatomic adsorption interactions and the modulation of gas diffusion by microporous structures. This work provides pioneering insights into trace impurity detection within high-concentration F-gas atmosphere while presenting a potentially viable solution for the operational maintenance of F-gas-based industrial equipment (F-equipment) in industrial applications.