73. [Chemical Engineering Journal] Ultra-stretchable wearable strain sensors based on skin-inspired adhesive, tough and conductive hydrogels
writer：Qin Zhang, Xin Liu, Lijie Duan, Guanghui Gao
keywords：Hydrogel Adhesive Tough Conductive Wearable strain sensor
source：期刊
Issue time：2019年
With increasing interest and demand for wearable sensor devices, fabricating a flexible hydrogel sensor combining
high toughness and adhesiveness is necessary but remains challenging. In this work, inspired by the
delamination structure of skin, an ultra-stretchable wearable hydrogel strain sensor with double layers is successfully
prepared via in-situ polymerization of nucleobase-driven adhesive hydrogels on the surface of conductive
tough hydrogels crosslinked by hydrophobic association. The hydrogel exhibits ultra-stretchability, high
mechanical strength, and robust adhesion to various solid materials as well as skin. Furthermore, the hydrogel
also exhibits high strain sensitivity and stability as a flexible and wearable strain sensor to detect large-range
human motions and tiny physiological signals. Notably, the adhesive layer not only ensures a robust adhesion
between the sensors and skin, but also protects skin from current harm when the hydrogels contact with skin
directly, because of effectively blocking the current from the conductive tough layer. It is envisioned that the
skin-inspired strategy would provide novel inspiration for the development of hydrogel strain sensors.