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Programmable chiroptical multilayer films assembled from self-healing stretchable elastomers for information encryption
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DOI：10.1039/D5TC01653C.png)
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Abstract
En 中文
Flexible chiroptical materials with strong and tunable optical activity are highly desirable for applications in optical encryption; quantum communication; and wearable photonic devices. Recently; various strategies have been developed for constructing flexible chiral plasmonic films. Among these; combining uniaxial alignment with twisted multilayer stacking offers an effective and scalable route to generate strong chiroptical signals using achiral building blocks. However; a key challenge remains in achieving highly ordered plasmonic nanostructures within deformable polymer matrices; which is essential for constructing tunable and robust chiral optical systems. Herein; we report a self-healing; ultra-stretchable hybrid elastomer composed of silver nanowires (AgNWs); waterborne polyurethane (WPU); and tempo-oxidized cellulose nanofibers (TOCNF); which enables the efficient formation of aligned anisotropic structures via uniaxial wet-stretching. The resulting AgNWs@WPU/TOCNF films exhibit ultrahigh stretchability (>1000%) and retain their orientation after drying. Importantly; the intrinsic self-healing capability enables seamless twist-stacking of pre-aligned films through water-assisted interfacial fusion; resulting in robust multilayer architectures with strong circular dichroism signals; characterized by a maximum ellipticity of 13.3° and an absorption dissymmetry factor exceeding 0.6. Further integration with a fluorescent layer yields circularly polarized emission films with a luminescence dissymmetry factor up to 0.5. Leveraging the programmable optical responses; a multilayer encryption device was fabricated for information encoding and decoding based on polarization states. This work provides a scalable and modular platform for developing self-healing chiroptical devices with tunable optical functionalities and high potential for photonic encryption and smart wearable technologies.
Keywords:
flexible chiroptical materials
chiral plasmonic films
self-healing elastomer
circular dichroism
optical encryption
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