The development of flexible pressure sensors having high stretchability and sensitivity with biocompatibility for wearable electronic devices has received great attention. However, the traditional strain sensors based on inorganic fillers or cross-linked ionic networks usually exhibit limited working range and uncontrollable sensitivity. In this work, a 3D hollow double-wrinkled hydrogel with controlled periodic wrinkled-like structure was efficiently prepared by sequentially pre-drawing the elastically chemical-crosslinked hydrogel and fast releasing in coagulating bath. The hollow double-wrinkled structure endowed the hydrogel with excellent piezoelectric sensitivity (the lowest pressure regime 15 Pa). Moreover, the density of the wrinkle structure on the gel surface can be precisely controlled by adjusting the corresponding parameters, so the hydrogels exhibited a controllable piezoelectric sensitivity. Such biodegradable wrinkled-like hydrogels would greatly broaden the application of tactile sensors in electronic skin, noninvasive healthcare, and biomimetic prostheses.

Controllable 3D hollow double-wrinkled chitosan/polyaniline hydrogels for highly sensitive pressure sensors

2019 Spring National Meeting

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