writer：Yuchong Zhang, Xiaoxia Le, Yukun Jian, Wei Lu,* Jiawei Zhang and Tao Chen*
keywords：Multi-functional hydrogels; 3D hydrogel geometry; Origami; Anti-counterfeiting; Fluorescence
source：期刊
specific source：Adv. Funct. Mater., 2019, 1905514
Issue time：2019年

Current fluorescence-based anti-counterfeiting strategies primarily encode information onto single two-dimensional (2D) planes and under-utilize the possibility of encrypting data inside three-dimensional (3D) structures to achieve multistage data security. Herein, we demonstrate a fluorescent hydrogel-based 3D anti-counterfeiting platform, which extends data encryption capability from single 2D planes to complex 3D hydrogel origami geometries. The materials are based on perylene tetracarboxylic acid-functionalized gelatin/poly(vinyl alcohol) hydrogels, which simultaneously show Fe3+-responsive fluorescence quenching, borax-triggered shape memory and self-healing properties. By employing origami technique, various complex 3D hydrogel geometries were facilely fabricated. On the basis of these results, 3D anti-counterfeiting platform was demonstrated, in which the data printed by using Fe3+ as the ink were safely protected inside complex 3D hydrogel origami structures. In this way, the encrypted data cannot be read until after specially predesigned procedures (both shape recovery and UV light illumination actions), indicating higher-level information security than the traditional 2D counterparts. This facile and general strategy opens up the possibility of utilizing 3D fluorescent hydrogel origami for data information encryption and protection.