Fluorescence light-up electrospun membrane incorporated with perovskite nanoclusters as a highly sensitive colorimetric probe for detection of amine vapors during food spoilage

Volatile amine vapors are harmful to the environment and humans, and intelligent, sensitive, and selective colorimetric perovskite nanoclusters-based sensing strips have attracted attention due to their outstanding ability to detect volatile amines in intelligent packaging systems. Herein, based on the light-down sensing principle, highly sensitive fluorescent probe strips with excellent revisability and durability characteristics were produced by encapsulating CsPbBr₃ nanoclusters in electrospun polyacrylonitrile (PAN) nanofibrous membrane (CPB*NFM). CPB*NFM strip sensors exhibited an obvious fluorescence quenching response at 513 nm when exposed to amine vapors with a low detection limit (87 ppb) and exhibited rapid attenuation due to reversible electrostatic electron transfer at the perovskite-NH_x interface. This phenomenon was attributed to a crystal change in CsPbBr₃ at the amine interface and its reversal after amine removal under normal atmospheric conditions. We believe the flexibility and stability of the devised CPB*NFM make them suitable for monitoring food spoilage in intelligent packing systems and for determining the amine contents of foods.