Shang Hui, Sun Yu, Le Xiaoxia, Shen Ying, Chen Tao
Key Laboratory of Advanced Marine Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China.
School of Chemical Sciences, University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing 100049, China.
Mater Horiz. 2024 Oct 28;11(21):5244-5250. doi: 10.1039/d4mh00996g.
The realization of dual-mode information display in the same material is of great significance to the expansion of information capacity and the improvement of information security. However, the existing systems lose the ability to re-encode information once they are constructed. Here, dynamic metal-ligand coordination is introduced into a novel hydrogel-based optical platform that allows rewritable dual-mode information display. The hydrogel system consists of a hard lamellar structure of poly(dodecylglyceryl itaconate) (pDGI) and soft double networks of poly(acrylamide)/poly(acrylic acid) (PAAm/PAAc) containing fluorescent carbon dots (CDs). As the carboxylic acid groups can coordinate with metal ions such as Al, the layer spacing of the lamellar structure is reduced while CDs aggregate, leading to the blue shift of the structural color and the red shift of the fluorescent color. Additionally, the metal chelating agent, ethylenediaminetetraacetic acid (EDTA), is able to strip away Al ions and restore the two colors, realizing an erasable dual-mode information display. This study opens up a path for the development of new materials and technologies for rewritable dual-mode information protection.
在同一材料中实现双模式信息显示对于扩大信息容量和提高信息安全性具有重要意义。然而，现有的系统一旦构建完成就失去了重新编码信息的能力。在此，动态金属-配体配位被引入到一种新型的基于水凝胶的光学平台中，该平台允许进行可重写的双模式信息显示。水凝胶系统由聚（十二烷基甘油衣康酸酯）（pDGI）的硬层状结构和包含荧光碳点（CDs）的聚（丙烯酰胺）/聚（丙烯酸）（PAAm/PAAc）软双网络组成。由于羧酸基团可以与诸如Al等金属离子配位，层状结构的层间距减小，同时CDs聚集，导致结构色蓝移和荧光色红移。此外，金属螯合剂乙二胺四乙酸（EDTA）能够去除Al离子并恢复两种颜色，实现了可擦除的双模式信息显示。这项研究为可重写双模式信息保护的新材料和技术的开发开辟了一条道路。
