Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China.
Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China.
Int J Biol Macromol. 2023 Jun 15;240:124438. doi: 10.1016/j.ijbiomac.2023.124438. Epub 2023 Apr 14.
Cellulose-based ionic conductive hydrogels (ICHs) have found extensive applications in flexible electronics and multifunctional sensors. However, simultaneous realization of sufficient conductivity, superior mechanical property and extreme environment tolerance for ICHs remains to be a huge challenge. In this work, a facile one-pot approach was developed to fabricate ICHs by directly dissolving cotton linter cellulose and polyvinyl alcohol (PVA) in a concentrated ZnCl solution. By regulating the content of PVA in ICHs, the optimal hydrogel (Gel-5) exhibits a tensile strength of 0.30 MPa, a compressive strength of 2.05 MPa and a conductivity of 8.16 S m. Moreover, the resulting dual-network ICHs present high transparency, good thermal reversibility and desirable ionic conductivity. Due to the high concentration of inorganic salts in the porous dual-network structure, the ICH presents good anti-drying and anti-freezing (as low as -90 °C) properties. Such hydrogel can be assembled into multi-functional sensors for human motion and temperature monitoring, and they demonstrate durable sensitivity, cycling stability in a wide operating temperature. This work will shed light on the design of cellulose-based hydrogels with good ionic conductivity and mechanical performance under extreme conditions.
基于纤维素的离子导电水凝胶（ICHs）在柔性电子和多功能传感器中得到了广泛的应用。然而，同时实现 ICHs 的高导电性、卓越的机械性能和极端环境耐受性仍然是一个巨大的挑战。在这项工作中，开发了一种简便的一锅法，通过直接将棉绒纤维素和聚乙烯醇（PVA）溶解在浓 ZnCl 溶液中制备 ICHs。通过调节 ICHs 中 PVA 的含量，优化后的水凝胶（Gel-5）表现出 0.30 MPa 的拉伸强度、2.05 MPa 的压缩强度和 8.16 S m 的电导率。此外，所得的双网络 ICHs 具有高透明度、良好的热可逆性和理想的离子导电性。由于多孔双网络结构中含有高浓度的无机盐，ICH 具有良好的抗干燥和抗冻结（低至-90°C）性能。这种水凝胶可以组装成用于人体运动和温度监测的多功能传感器，它们表现出在宽工作温度范围内持久的灵敏度和循环稳定性。这项工作将为设计在极端条件下具有良好离子导电性和机械性能的基于纤维素的水凝胶提供启示。
