MXene-Based Conductive Organohydrogels with Long-Term Environmental Stability and Multifunctionality

作者：Wei, Yuan; Xiang, Lijing; Ou, Huajie; Li, Fang; Zhang, Yazeng; Qian, Yangyang; Hao, Lijing; Diao, Jingjing; Zhang, Mengli; Zhu, Penghui; Liu, Yijun; Kuang, Yudi^*; Chen, Gang^*

来源：Advanced Functional Materials, 2020, 30(48): 2005135.

DOI：10.1002/adfm.202005135

• antifreezing
• environmental stability
• MXenes
• organohydrogels
• self-adhesion

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.

• 单位
  中国科学院