Zhao Kaitian, Liu Fan, Sun Hongcan, Xia Pengfei, Qu Junfeng, Lu Changgui, Zong Shenfei, Zhang Rong, Xu Shuhong, Wang Chunlei
School of Electronic Science & Engineering, Southeast University, Nanjing, 210096, China.
Department of Obstetrics and Gynecology, the Second Hospital of Nanjing, Nanjing University of Chinese Medicine, Nanjing, 210096, China.
Small. 2024 Jan;20(1):e2305211. doi: 10.1002/smll.202305211. Epub 2023 Aug 30.
Traditional fluorescent anti-counterfeiting labels based on "on-off" fluorescence can be easily cloned. It is important to explore advanced anti-counterfeiting fluorescent labels with high-level security. Here, a pioneering ion species- and ion concentration-dependent anti-counterfeiting technique is developed. By successive loading Cu -sensitive yellow emitted carbon dots (Y-CDs) and Cu non-sensitive blue emitted carbon dots (B-CDs) into metal-organic frameworks (MOFs) and followed by electrospinning, the B&Y-CDs@MOF-nanofibrous films are prepared. The results show that the use of MOF not only avoids the fluorescence quenching of CDs but also improves the fluorescence stability. The fluorescence Cu -sensitivity of the CDs@MOF-nanofibrous films can be regulated by polymer coating or lamination. The fluorescent label consisting of different Cu -sensitivity films will show Cu concentration-dependent decryption information. Only at a specific ion species and concentration (Cu solution of 40-90 µm), the true information can be read out. Less or more concentration (<40 or >90 µm) will lead to false information. The identification of the real information depends on both the species and the concentration. After Cu treatment, the fluorescence of the label can be recovered by ethylenediaminetetraacetic acid disodium (EDTA-2Na) for further recycling. This work will open up a new door for designing high-level fluorescent anti-counterfeiting labels.
基于“开-关”荧光的传统荧光防伪标签很容易被克隆。探索具有高安全性的先进防伪荧光标签非常重要。在此，开发了一种开创性的依赖离子种类和离子浓度的防伪技术。通过将对铜敏感的黄色发射碳点（Y-CDs）和对铜不敏感的蓝色发射碳点（B-CDs）依次负载到金属有机框架（MOFs）中，然后进行静电纺丝，制备了B&Y-CDs@MOF纳米纤维膜。结果表明，MOF的使用不仅避免了碳点的荧光猝灭，还提高了荧光稳定性。CDs@MOF纳米纤维膜的荧光铜敏感性可以通过聚合物涂层或层压来调节。由不同铜敏感性膜组成的荧光标签将显示出依赖铜浓度的解密信息。只有在特定的离子种类和浓度（40-90μm的铜溶液）下，才能读出真实信息。浓度过低或过高（<40或>90μm）都会导致错误信息。真实信息的识别取决于离子种类和浓度。经过铜处理后，标签的荧光可以通过乙二胺四乙酸二钠（EDTA-2Na）恢复，以便进一步循环使用。这项工作将为设计高级荧光防伪标签打开一扇新的大门。
