With the increasing emphasis on information security, reliable information encryption materials have been urgently desired. Herein, a hydrogel‐based dual encryption platform with self‐erasure function is developed, which exhibits both high‐security level and possibility of reuse. Dual encryption of the hydrogel‐based platform is realized by elegantly combining 2D fluorescent information pre‐written/printed via competitive coordination with pH‐induced shape deformation of the PSSA/PDEAEMA‐APA/Eu3+ hydrogel. On‐demand decryption of the concealed information is realized by immersing the platform in solution of specific pH and exposed to 254 nm irradiation, which fully utilizes simultaneous shape recovery and fluorescence quenching of the hydrogel. With prolong of the immersion time, the carried information self‐erases permanently, which effectively prevents leakage of information to non‐recipient and further ensures information security. Thanks to the reversible pH‐responsive behaviors and repeatable self‐erasure ability, the hydrogel‐based dual encryption platform could recover to a 2D blank plane after decryption and self‐erasure, which is of great potential in high‐security information encryption.
Simultaneously stretchable and compressible flexible strain sensors are highly desired in many advanced applications including the wearable field. However, the fabrication of such dual-function sensors with a wide sensing range is still challenging. In this work, a simultaneously stretchable and compressible foam strain sensor was fabricated by skillfully introducing oriented pores into the highly stretchable elastic composite based on carbon nanotubes and poly(styrene-b-ethylene–butylene-b-styrene) (SEBS) by a freeze-drying method, in which cyclohexane was employed as the freeze-drying solvent. The high stretchability of SEBS and the abundant compressible space imparted by the pores endowed the resultant flexible foam sensor with highly stretchable (250%) and compressive (−50%) characteristics simultaneously. Thanks to the outstanding flexible features, the foam sensor enabled simultaneous monitoring of multiple human movements, such as bidirectional wrist bending, knee bending, foot stepping, and so forth. The foam sensor could encrypt human gesture signals into electrical signals and transmit them to the machine to realize the human–computer interaction, which could greatly broaden the application prospect of flexible strain sensors in the field of intelligent sensing.
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