Zeng Guofan, Yi Nuozhou, Guo Qiaohang, Han Fei, Weng Mingcen
Department of Physical Education, Fujian University of Technology, Fuzhou 350118, China.
Institute of Biology and Chemistry, Fujian University of Technology, Fuzhou 350118, China.
Polymers (Basel). 2025 Aug 20;17(16):2249. doi: 10.3390/polym17162249.
Wearable conductive hydrogel sensors, which are highly convenient, have attracted attention for their great potential in human motion monitoring and smart healthcare. However, the self-adhesive properties, sensing performance, and stability of traditional hydrogels are not ideal, which seriously hinders their use in monitoring and diagnosing joints throughout the human body. Here, CaCl is used to crosslink PVA to improve its self-adhesive properties, and it is then combined with a CNT conductive network. Next, a cyclic freeze-thaw strategy is utilized to fabricate a wearable PVA-Ca-CNT hydrogel with excellent self-adhesive properties and stability. PVA-Ca-CNT hydrogels can adhere to various substrates, with a maximum self-adhesion strength of 398 kPa and a unit adhesion energy of as high as 305 μJ cm. Furthermore, the CNT three-dimensional network enhances the tensile strength to 110 kPa, with almost no hysteresis. Based on resistance changes, PVA-Ca-CNT hydrogel exhibits a sensitivity of up to 11.11 as a strain sensor as well as a response to strain stimuli within 180 ms. When PVA-Ca-CNT hydrogel is adhered to the surface of human skin, it operates as a sensor for monitoring human movement. Not only can it accurately monitor the movement positions of major joints in the human body, it can also accurately identify tiny movements of the fingers and be used as a finger Morse code output device, which demonstrates the enormous potential of human motion monitoring systems based on self-adhesive hydrogel sensors in practical applications.
可穿戴导电水凝胶传感器非常便捷，因其在人体运动监测和智能医疗保健方面的巨大潜力而备受关注。然而，传统水凝胶的自粘性、传感性能和稳定性并不理想，这严重阻碍了它们在监测和诊断人体各个关节中的应用。在此，使用氯化钙交联聚乙烯醇（PVA）以改善其自粘性，然后将其与碳纳米管（CNT）导电网络相结合。接下来，采用循环冻融策略制备了一种具有优异自粘性和稳定性的可穿戴PVA-Ca-CNT水凝胶。PVA-Ca-CNT水凝胶可以粘附在各种基材上，最大自粘强度为398千帕，单位粘附能高达305微焦每平方厘米。此外，碳纳米管三维网络将拉伸强度提高到110千帕，几乎没有滞后现象。基于电阻变化，PVA-Ca-CNT水凝胶作为应变传感器时灵敏度高达11.11，并且在180毫秒内对应变刺激作出响应。当PVA-Ca-CNT水凝胶粘附在人体皮肤表面时，它可作为监测人体运动的传感器。它不仅可以准确监测人体主要关节的运动位置，还可以准确识别手指的微小运动，并用作手指莫尔斯电码输出设备，这展示了基于自粘性水凝胶传感器的人体运动监测系统在实际应用中的巨大潜力。
