Programming Multistate Aggregation‐Induced Emissive Polymeric Hydrogel into 3D Structures for On‐Demand Information Decryption and Transmission

Abstract

Fluorescent hydrogels have recently become one of the most prominent materials for smart confidential information protection. But it is still quite challenging to develop a 3D anticounterfeiting platform with on‐demand information decryption and transmission capacities, which are of great importance to achieve high‐level data protection security. Herein, robust aggregation‐induced emissive polymeric hydrogels with thermo‐triggered multistate fluorescence switching, shape memory, and self‐healing properties based on supramolecular dynamic lanthanide coordination interactions are presented. By a collective action of these promising properties, a fluorescent hydrogel‐based 3D information encoding platform is demonstrated for on‐demand information decryption, in which information pre‐encrypted in 3D hydrogel structures is stepwise decrypted by the control of external stimuli. Such unique on‐demand information decryption features are further expanded to the transmission of manifold customized messages to multiple receivers. Herein, the possibility of utilizing 3D fluorescent hydrogel structures for high‐level information encryption and on‐demand decryption is opened up.

Dual‐Channel Flexible Strain Sensors Based on Mechanofluorescent and Conductive Hydrogel Laminates

“…Polydimethylsiloxane (PDMS, 0.2-0.5 mm) were purchased from Xian Ruiya Organic Chemistry Co. Ltd. Acrylamide (AAM, 98.0%) and ethanol (99%) were obtained from Sinopharm Chemical Reagent Co. Ltd. 2-Hydroxy-4″-(2-hydroxyethoxy)-2-methylpropiophenone (I-2959, >98.0%) were purchased from TCI (Shanghai) Development Co. Ltd. 4-(2-dimethylaminoethyloxy)-N-allyl-1,8-naphthalimide (DAEAN) were synthesized according to the procedures described in the previous study. [47] HEAA passed through an alumina column to remove stabilizer before use. Other materials were used without further purification.…”

“…In a typical experiment, a blue fluorescent P(AAc-AAm-DAEAN) (PAAD) hydrogel was first produced by the radical poly merization of 4-(dimethylamino)ethoxy-N-allyl-1,8-naphthalimide (DAEAN), acrylic acid (AAc), acrylamide (AAm), potassium persulfate (KPS) and N,N′-methylenebisacrylamide crosslinker. [47] The blue fluorescent hydrogel was specially grafted with the active N-hydroxysuccinimide ester groups in order to enable the stable bonding between the P(AAc-AAm-DAEAN) and RB-PHEAA films via the esterification reaction depicted in Figure 4b,c. When these new devices were stretched by 50% under UV light, the hidden patterns ("CAS" or "10") were clearly revealed (Figure 4d).…”

Information Storage Based on Stimuli‐Responsive Fluorescent 3D Code Materials

“…The introduction of stimuli-responsive fluorescent elements into 3D code materials can be a promising strategy to realize the tunable information transformation. [51][52][53][54][55][56][57][58][59][60] First, for example, various fluorophores have colorful fluorescence emissions, which can be utilized to meet the color requirement of 3D codes. More importantly, the distinctive stimuli responsiveness of fluorescence emissions can endow the 3D codes with pattern transformation ability through the switch in fluorescent colors upon specific physical or chemical stimuli, thereby realizing information transformation.…”

Progress in aggregation‐induced emission‐active fluorescent polymeric hydrogels

“…[25] Up to now, although the research on AIE-active FPHs is still in infancy, a number of elegant studies have been reported. [26][27][28][29][30][31][32][33][34][35][36][37] Nevertheless, these is no reported review to summarize the progress on these flourishing materials. Herein, we try to give a systematic overview on the construction and fluorescence properties of AIE-active FPHs.…”