Flexible ratio fluorescent film towards multifunctional sensor: high-performance H2S sensing, self-sterilization and integrated application

As the significant role of hydrogen sulfide (H 2 S) in the fields of health, safety and environmental protection, the exploitation of portable sensing platforms for real-time H 2 S monitoring with versatile antibacterial function is highly anticipated. Herein, a multifunctional fluorescence film sensor (Zr-MOF&RB-P@F) with self-antibacterial performance was constructed by electrospinning method for convenient and accurate detection of H 2 S. Ratiometric sensing process with color changes could be achieved in this system by utilizing the Zr centered metal-organic framework (Zr-MOF) as fluorescent responder and rose bengal modifed polymer (RB-P) as reference unit. As anticipated, the flexible film exhibited low detection limit of 22.4 μM, superior selectivity, visual recognition ability and improved photostability, demonstrating the availability of the design strategy. In addition, excellent antibacterial ability of the film was endowed by the photosensitive RB-P, realizing an antibacterial efficiency of 87.5%. Moreover, the obtained flexible sensing film was able to evaluated the food freshness in real-time and simultaneously decrease their bacterial deterioration, which revealed great potential as intelligent packaging in food safety field. This research provided a valuable reference for the design of flexible multifunctional sensing material, and gave a promising platform for the comprehensive security protection applications.