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A photochromic hydrogel based on rhodamine B Schiff base for strain sensors with ultra-stretchability, high sensitivity, and visual information encryption capabilities
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DOI：10.1016/j.reactfunctpolym.2026.106778.png)
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Abstract
En 中文
Flexible strain sensors have garnered significant interest for applications in wearable devices, health monitoring, and electronic skin. However, their functionality is typically confined to electrical signal output, lacking an intuitive visual feedback mechanism, which severely limits their application in scenarios requiring rapid visual interaction. Although attempts have been made to integrate color-changing mechanisms, the mechanical and electrical properties of existing systems are often inadequate. This paper presents a simple yet effective strategy for preparing a multifunctional hydrogel with outstanding mechanical properties, conductivity, and photochromic characteristics by copolymerizing acrylamide (AAm), (3-acrylamidopropyl) trimethylammonium chloride (APTAC), octadecyl acrylate (C18), and rhodamine B-3-allylsalicylaldehyde hydrazone. Benefiting from the synergistic effects of dynamic ionic interactions, hydrophobic associations, hydrogen bonding, and coordination, the resulting hydrogel exhibits ultrahigh extensibility (fracture strain 2550%), high sensitivity (a gauge factor of up to 29.17), and rapid photochromic performance. Leveraging this highly integrated functionality, the hydrogel successfully enables a novel flexible device capable of simultaneously achieving precise electrical monitoring of human motion, visual information display, and encryption. This work not only provides a high-performance material but also demonstrates an effective strategy for achieving multifunctional integration through rational molecular design, thereby advancing the development of next-generation intelligent, flexible electronics.
Keywords:
Strain sensors
Photochromic hydrogel
High sensitivity
Visual information encryption
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5.1
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23
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0
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