[Science China Materials] Ionprinting controlled information storage of fluorescent hydrogel for hierarchy and multi-dimensional decryption
writer：Xiaoxia Le, W Lu, J He, J Zheng, M. J. Serpe, Jiawei Zhang*, and Tao Chen*
keywords：hydrogel, actuator, gradient, decryption
source：期刊
specific source：Science China Materials, 2019, Inpress
Issue time：2019年
Owning to the prevalence of counterfeit activities and information leakage in the current age, information storage and corresponding encryption/decryption are highly important, which have aroused wide attention. Herein, we propose a novel method as an alternative strategy to store information via controllable ionoprinting onto fluorescent hydrogel for hierarchical and multidimensional decryption. Through incorporating pyrene moieties and carboxylic groups into polymeric hydrogel network, fluorescence changing and controllable shape deformation
behaviors could be achieved and integrated by ionoprinting of Fe3+ ions. The diffusion of Fe3+ ions into fluorescent hydrogel can quench the fluorescence of pyrene moieties, and chelate with carboxylic groups to generate anisotropic structures for shape deformation simultaneously. Thus, fluorescence quenching-based 2D information and actuation-based 3D information could be hierarchically decrypted when exposure to UV light and being put
into water, respectively. Importantly, the stored information could be erased by replacing Fe3+ with H+, which allows the fluorescent hydrogel as a recyclable information storage material. This work may provide new insights in designing and fabricating of novel soft devices for hierarchical and multi-dimensional information encryption, against the rising problems of
counterfeiting and confidential information disclosure.