Rubber-like Deep Eutectic Solvent-Assisted Poly(<i>N</i>-acryloylglycinamide) Hydrogel for Highly Sensitive Pressure Detecting
Jia Li, Tianyuan Gao, Zihang Liang, Yihan Zhang, Haibing Zhang, Qihe Peng, Zhu Xu, Alaa S. Abd‐El‐Aziz, Xinyue Zhang, Ning Ma, Li Ma
Abstract
Deep eutectic solvent (DES)-based conductive hydrogels have attracted great interest in the building of flexible electronic devices that can be used to replace conventional temperature-intolerant hydrogels and expensive ionic liquid gels. However, current DES-based conductive hydrogels obtained have limited mechanical strength, high hysteresis, and poor microdeformation sensitivity of the assembled sensors. In this work, a rubber-like conductive hydrogel based on N -acryloylglycinamide (NAGA) and DES (acetylcholine chloride/acrylamide) has been synthesized by a one-step method. The prepared conductive PNAGA-DES hydrogel has exhibited excellent mechanical strength, stability, and resilience during the long-term loading–unloading cycles, endowed with service durability. Besides, the as-prepared PNAGA-DES also possesses high transparency, high conductivity, and favorable antienvironmental disturbance, which can enhance the designability and robustness of the PNAGA-DES-based devices. Based on the remarkable properties, the PNAGA-DES hydrogel can be used for wearable pressure-strain sensors with high sensitivity of tiny strain for transferring information (gauge factor (GF) = 8.18, 0.2–2% strain) and long-term stability. Furthermore, it can also sensitively detect the large strain of human motion, showing potential application in information interaction and wearable electronics.