[Adv. Funct. Mater.] Heterogeneous fluorescent organohydrogel enables dynamic anti-counterfeiting
作者：Xiaoxia Le, Hui Shang, Shuangshuang Wu, Jiawei Zhang, Mingjie Liu*, Yinfei Zheng, and Tao Chen*
關鍵字：fluorescent pattern, organohydrogel, dynamic anti-counterfeiting, stimuli responsiveness, information decryption
論文來源：期刊
具體來源：Adv. Funct. Mater., 2021, 31, 2108365
發表時間：2021年
Fluorescent patterns showing the unique color change in response to external stimuliare of considerable interest for their applications in anti-counterfeiting. However, thereis still a lack of intelligent fluorescent patterns with high-security levels, presenting adynamic display of encrypted information. In this study, a fluorescent organohydrogelwas fabricated through a two-step interpenetrating technique, leading to the coexistence of naphthalimide moieties (DEAN, green-yellow fluorescent monomer)contained Poly(N,N-dimethylacrylamide) (PDMA) hydrogel network and Polyoctadecylmethacrylate (PSMA) organogel network bearing spiropyran moieties (SPMA,photochromic monomer). Due to the unique heterogeneous networks, the fluorescencecolor went through a continuous change from green to yellow to red via the fluorescence resonance energy transfer (FRET) process with the extension ofirradiation time. In addition, when H + was introduced into the system, SP units exhibittransformation into the protonated merocyanine (MCH + ) rather than merocyanine(MC) under UV light, which inhibits the FRET process. By selectively being treated withH + , the fluorescent organohydrogel can act as an effective platform for encryptingsecret information, making them more difficult to forge.