文献类型：期刊文献

英文题名：A Time-Dependent Fluorescent Hydrogel for "Time-Lock" Information Encryption

作者：Wang, Qian[1];Qi, Zhen[1];Wang, Qi-Meng[1];Chen, Meng[1];Lin, Biyan[1];Qu, Da-Hui[1]

机构：[1]East China Univ Sci & Technol, Sch Chem & Mol Engn, Joint Res Ctr, Key Lab Adv Mat & Feringa Nobel Prize Scientist J, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2022

卷号：32

期号：49

外文期刊名：ADVANCED FUNCTIONAL MATERIALS

收录：;EI(收录号：20224112849876);WOS:【SCI-EXPANDED(收录号:WOS:000863007800001)】；

基金：Q.W. and Z.Q. contributed equally to this work. This work was supported by National Natural Science Foundation of China (grants 22025503, 21790361, and 21871084), Shanghai Municipal Science and Technology Major Project (Grant 2018SHZDZX03), the Fundamental Research Funds for the Central Universities, the Programme of Introducing Talents of Discipline to Universities (grant B16017), Program of Shanghai Academic/Technology Research Leader (19XD1421100), Science and Technology Commission of Shanghai Municipality (21JC1401700), and the Starry Night Science Fund of Zhejiang University Shanghai Institute for Advanced Study (grant SN-ZJU-SIAS-006). The authors thank the Research Center of Analysis and Test of East China University of Science and Technology for help on the material characterization.

语种：英文

外文关键词：fluorescent hydrogels; information encryption; self-erasing materials; tuneable fluorescence

摘要：Information encryption has become increasingly important in recent years; however, information encryption materials, especially those encrypting on a time scale, are still in fancy. Herein, a "time-lock" information encryption material is developed based on a time-dependent fluorescent hydrogel. The fluorescence color of this hydrogel can be regulated between green and yellow, with distinctive changes in intensity, on a time scale by controlling the concentration of urea/urease and HCl. By taking advantage of this feature, "time-locked" information can be encoded. Such information self-erases with time, and moreover, fake or even opposing information is generated during this process. The correct information can only be recognized at a specified time, i.e., using a "time-key" to decrypt the information. This time-dependent feature endows the material with a higher level of security and provides new insight for information encryption.