An effective and reliable fluorescent sensor for selective detection of methylamine gas based on in-situ formation of MAPbBr3 perovskite nanocrystals in electrospun fibers

The development of fluorescent sensor based on lead-based perovskite nanomaterials is of the most intriguing for the design of quick check with low concentration. In the present work, a rapid, stable, and sensitive fluorescent sensor for selective detection of methylamine (MA) gas is firstly constructed based on in-situ formation of MAPbBr(3) (methylamine lead bromide, that is CH3NH3PbBr3) perovskite nanocrystals (PNCs) in electrospun fi-bers by reacting MA gas with DMAPbBr(3)@PVDF (dimethylammonium lead bromide@poly (vinylidene fluoride), that is (CH3)(2)NH2PbBr3@PVDF) fibers. In this strategy, not only is the stability of PNCs significantly enhanced, but also does it retain the sensing efficiency due to the excellent permeability of the membrane. The sensor can maintain its stability after storage for two months due to its superior resistance to moisture, which is highly important for real-world applications. Finally, the nanofibers show a dual-mode sensor response to 5-200 ppm MA gas with a limit of detection (LOD) of 0.8 ppm.