基于苝二酰亚胺的荧光变色型聚氨酯基柔性传感器制备及其在苯系物蒸气检测中的应用OA

The development of portable fluorescent color-changing flexible sensors for the detection of benzene series vapors is highly significant given their volatility and toxicity.To achieve ultra-efficient visual detection,two fluorescent probes HO-PDI-OH and UPy-PDI-UPy were developed by employing perylene diimide as the fluorescent unit,tetra-ethylene glycol ethoxy group as the side chain,and hydroxyl or urea pyrimidinone as the spatial constraint group,respectively.Flexible fluorescent sensors S1 and S2 were then fabricated by combining the probes with polyurethane matrix.It was indicated that the spatial confinement effect provided by the spatial constraint groups in synergy with the polyurethane matrix determined the detection performance.Specifically,the sensor S2 based on the urea pyrimidinone spatial constraint group UPy-PDI-UPy demonstrated remarkable performance in benzene vapor detection.It exhibited a broad fluorescence color-changing range from orange to green,a rapid detection speed of less than 3 minutes,and a low detection limit of 8.1 μmol/L,which suggested its potential as a specific fluorescent sensor for benzene vapor.This work offers a viable strategy for novel fluorescent color-changing flexible sensors for detecting benzene series vapor.