Key Laboratory of Bio-based Material Science and Technology (Ministry of Education), Northeast Forestry University, Harbin 150040, PR China.
Sustainable Functional Biomaterials Laboratory, Department of Wood Science, University of British Columbia, Vancouver, BC V6T 1Z4, Canada.
Carbohydr Polym. 2022 May 15;284:119199. doi: 10.1016/j.carbpol.2022.119199. Epub 2022 Jan 31.
The application of flexible multifunctional sensors based on conductive hydrogels in human health detection has been widely studied. Herein, a facile one-pot method is proposed to prepare ionic conductive hydrogels by dissolving polyvinyl alcohol (PVA), cellulose nanofiber (CNF), and aluminum chloride hexahydrate (AlCl·6HO) in a dimethyl sulfoxide (DMSO)/water binary solvent. The resulting ionically-conductive organohydrogels have high stretchability (up to 696%), fast response (130 ms), wide operating temperature (-50 °C to 50 °C), and long-term stability (30 days). The hydrogel sensor exhibits excellent signal sensing capability (human motion and sound detection signals) and cycling stability (1000 cycles) under extreme temperature and long-term storage conditions. Notably, the organohydrogel displays high sensitivity to both compressive deformation and temperature, resulting in multifunctional sensing performance. This work provides a viable approach for the long-term use of hydrogels as wearable devices in extreme environments and daily life.
基于导电水凝胶的柔性多功能传感器在人体健康检测中的应用已得到广泛研究。在此，提出了一种简便的一锅法，通过将聚乙烯醇（PVA）、纤维素纳米纤维（CNF）和六水合氯化铝（AlCl·6HO）溶解在二甲基亚砜（DMSO）/水二元溶剂中制备离子导电水凝胶。所得到的离子有机水凝胶具有高拉伸性（高达 696%）、快速响应（130ms）、宽工作温度（-50°C 至 50°C）和长期稳定性（30 天）。在极端温度和长期储存条件下，水凝胶传感器表现出优异的信号传感能力（人体运动和声音检测信号）和循环稳定性（1000 次循环）。值得注意的是，该有机水凝胶对压缩变形和温度均具有高灵敏度，从而实现了多功能传感性能。这项工作为水凝胶在极端环境和日常生活中作为可穿戴设备的长期使用提供了一种可行的方法。
