Enhanced ammonia sensing with the MAPbBr3 perovskite and (R/S)-OBN-tCz: a study on sensitivity and stability improvements

Abstract

This paper presents an ammonia (NH₃) fluorescent sensor based on the MAPbBr₃ perovskite and the multifunctional organic material (R/S)-OBN-tCz. The incorporation of (R/S)-OBN-tCz enhances the sensor's photoluminescence (PL) intensity through Förster resonance energy transfer (FRET) and passivation effects, which consequently improves the sensitivity of the gas sensor. The MAPbBr₃&(R/S)-OBN-tCz@PMMA nanofibers fabricated via electrospinning technology not only increase the specific surface area effectively, which is crucial for sensitivity improvement, but also strengthen the stability of the perovskite material under an air atmosphere. The experimental results demonstrate that the sensor maintains stable PL performance for up to 30 days in air and over 10 hours in water, while exhibiting rapid and reversible fluorescence response to NH₃.