UTSA-16(Zn) for SO2 detection: elucidating the fluorescence mechanism

Abstract

In this study, the potential of metal-organic framework UTSA-16(Zn) as a fluorescent detector for SO₂ is explored. Material was synthesized, characterized by powder X-ray diffraction (PXRD), infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA), and its fluorescent behavior was analyzed before and after SO2 exposure. A significant decrease in fluorescence intensity was observed and a LOD of 1.79 mM (~114.6 ppm) was obtained. With the help of time-resolved photoluminescence (TRPL) experiments and X-ray photoelectron (XPS) and ultraviolet-visible (UV-vis) spectroscopy, a static quenching mechanism due to the formation of a non-fluorescence complex in the ground state (GSC) was elucidated.