Owning to the viscoelastic properties, good biocompatibility and high strain sensitivity, choline chloride-based deep eutectic solvent (DES) hydrogels have been considered to be promising wearable strain sensors for human motion. However, traditional hydrogels are far away from the wearable strain sensor applications caused by their unsatisfied conductivity and weak mechanical properties. Herein, the strategy for functional ionic inorganic/organic interpenetrating (IPN) hydrogels preparation by cyclic freezing/thawing method was successfully developed. Polyvinyl alcohol (PVA) was proposed to dissolve in choline chlorede-based DES as hydrogel matrix for the first time. Encouragingly, the obtained DES/PVA/CNCs/g-C₃N₄ hydrogel (choline chloride with glucose) exhibits excellent mechanical properties, included excellent tensile strength (≈ 2.55 MPa), high elongation (≈1200 %) and satisfactory tensile modulus (≈3.65 MPa). Interestingly, the thermal diffusivity (the maximum value was 0.675 W/mK) and conductivity (the maximum value was 0.18 mm²/s) of the DES-hydrogels were successfully achieved through adding graphitic-like nitride nanosheet (g-C₃N₄) and sustainable cellulose nanocrystalline (CNCs). These enhancements were attributed to the synergistic interactions of powerful hydrogen bonding among DES, CNCs, g-C₃N₄ and PVA chains. More importantly, the as-prepared hydrogels have the potential as a human motion sensor to accurately in-situ detect human activities on the fingers, wrists, elbows and knee joints. Those hydrogel-type strain sensors with flexibility, excellent mechanical properties, self-recovery, good heat transfer, and electrical conductivity have broad application prospects in the fields of intelligent robot, bionic prostheses, and human care areas.

归因于粘弹性，良好的生物相容性和高应变敏感性，基于胆碱氯化物的深共熔溶剂（DES）水凝胶被认为是人类运动的可穿戴应变传感器。然而，传统的水凝胶由于其不令人满意的电导率和较弱的机械性能而远离可穿戴应变传感器的应用。本文成功开发了通过循环冻融法制备功能性离子无机/有机互穿（IPN）水凝胶的策略。提出了首次将聚乙烯醇（PVA）溶解在胆碱二氯苯酚DES中作为水凝胶基质。令人鼓舞的是，获得的DES / PVA / CNCs / gC ₃ N ₄水凝胶（含葡萄糖的氯化胆碱）具有出色的机械性能，包括出色的拉伸强度（约2.55 MPa），高伸长率（约1200％）和令人满意的拉伸模量（约3.65 MPa）。有趣的是，通过添加石墨状的氮化物纳米片（gC ₃ N ₄）成功地获得了DES-水凝胶的热扩散率（最大值为0.675 W / mK）和电导率（最大值为0.18 mm ² / s）。可持续纤维素纳米晶（CNC）。这些增强归因于DES，CNC，gC ₃ N ₄之间强大的氢键之间的协同相互作用和PVA链。更重要的是，所制备的水凝胶具有作为人体运动传感器的潜力，可以准确地原位检测手指，腕部，肘部和膝关节上的人体活动。那些具有柔韧性，优异的机械性能，自恢复性，良好的传热性和导电性的水凝胶型应变传感器在智能机器人，仿生假肢和人类护理领域具有广阔的应用前景。