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

Abstract

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-NHx 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.