MXene-Based Conductive Organohydrogels with Long-Term Environmental Stability and Multifunctionality
MXene-Based Conductive Organohydrogels with Long-Term Environmental Stability and Multifunctionality
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具有长期环境稳定性和多功能性的基于 MXene 的导电有机水凝胶
DOI：
10.1002/adfm.202005135
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发表时间：
2020-09-18
影响因子：
19
通讯作者：
Chen, Gang
中科院分区：
文献类型：
--
作者：
Wei, Yuan;Xiang, Lijing;Chen, Gang
导电水凝胶是一种很有前途的界面材料，可用于生物电子学中的人机交互。然而，低温冻结问题和水分蒸发引起的结构破坏严重阻碍了其实际应用。为了解决这些问题，本文中，通过将高度导电的MXene纳米片引入用甘油（Gly）/水二元溶剂渗透的单宁酸修饰的纤维素纳米纤丝/聚丙烯酰胺混合凝胶网络中来制造精心设计的纳米复合有机水凝胶。由于Gly的引入，所制备的有机水凝胶在宽的温度范围（从-36至60摄氏度）下表现出出色的柔性和导电性，并且在开放环境中表现出长期稳定性（>7天）。此外，动态儿茶酚-硼酸酯键，沿着水和Gly分子之间容易形成的氢键，进一步赋予有机水凝胶优异的拉伸性（约1500%应变）、高组织伸展性和自愈合性质。有利的环境稳定性和广泛的工作应变范围（约500%应变）;加上高灵敏度（8.21的应变系数），使这种有机水凝胶成为一个有前途的候选人，为大型和微妙的运动监测。
Conductive hydrogels are promising interface materials utilized in bioelectronics for human-machine interactions. However, the low-temperature induced freezing problem and water evaporation-induced structural failures have significantly hindered their practical applications. To address these problems, herein, an elaborately designed nanocomposite organohydrogel is fabricated by introducing highly conductive MXene nanosheets into a tannic acid-decorated cellulose nanofibrils/polyacrylamide hybrid gel network infiltrated with glycerol (Gly)/water binary solvent. Owing to the introduction of Gly, the as-prepared organohydrogel demonstrates an outstanding flexibility and electrical conductivity under a wide temperature spectrum (from -36 to 60 degrees C), and exhibits long-term stability in an open environment (>7 days). Additionally, the dynamic catechol-borate ester bonds, along with the readily formed hydrogen bonds between the water and Gly molecules, further endow the organohydrogel with excellent stretchability (approximate to 1500% strain), high tissue adhesiveness, and self-healing properties. The favorable environmental stability and broad working strain range (approximate to 500% strain); together with high sensitivity (gauge factor of 8.21) make this organohydrogel a promising candidate for both large and subtle motion monitoring.