Perovskite
quantum dots with excellent optical properties and robust
durability stand as an appealing and desirable candidate for fluorescence
resonance energy transfer (FRET) based fluorescence detection, a powerful
technique featuring excellent accuracy and convenience. In this work,
a monolithic superhydrophobic polystyrene fiber membrane with CsPbBr3 perovskite quantum dots encapsulated within (CPBQDs/PS FM)
was prepared via one-step electrospinning. Coupling CPBQDs with PS
matrix, this CPBQDs/PS FM composite exhibits high quantum yields (∼91%),
narrow half-peak width (∼16 nm), nearly 100% fluorescence retention
after being exposed to water for 10 days and 79.80% fluorescence retention
after 365 nm UV-light (1 mW/cm2) illumination for 60 h.
Thanks to the outstanding optical property of CPBQDs, an ultralow
detection limit of 0.01 ppm was obtained for Rhodamine 6G (R6G) detection,
with the FRET efficiency calculated to be 18.80% in 1 ppm R6G aqueous
solution. Electrospun as well-designed fiber membranes, CPBQDs/PS
FM composite also possesses good tailorability and recyclability,
showing exciting potential for future implementation into practical
applications.