Flexible strain sensor based on photonic crystal hydrogel film doped with Fe3O4@C nanoparticles
As the most intuitive way of visual signal feedback,color change is often applied by living organisms to transmit signals and resist natural enemies due to its convenient and direct characteristics.Inspired by the structure color charge of discoloration of chameleons skin,a photonic hydrogel film that can be used for flexible strain detection was developed.Fe3O4@C nanoparticles were used as photonic crystal units,which could self-assemble into one-dimensional chain-like structure in the hydrogel under magnetic field.The structural color of the film will change with the photonic crystal band gap,the film will produce a synergistic color change under mechanical stretching.The resulting flexible film demonstrates bright structural colors,which exhibits a wide strain response up to 120％and achieves a color dynamic change from red(λ=730 nm)to purple(λ=400 nm).In addition,the prepared film exhibits high sensitivity,short response time and good stabilization.The superior performance of flexible strain detection is attributed to the flexible large deformation and good optical properties of the hydrogel film and highly tunable grating structure of the photonic crystal.This work offers a generic approach for the development of visually responsive strain sensors,and provides a wider application prospect in mechanical sensors,stretchable optics,and diagnostics.
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