材料科学
自愈水凝胶
乙烯醇
导电体
复合材料
碳纳米管
复合数
共价键
聚合物
纳米技术
高分子化学
化学
有机化学
作者
Haifei Wang,Jiameng Lu,Huayi Huang,Senlin Fang,Muhammad Zubair,Zhengchun Peng
标识
DOI:10.1016/j.jcis.2020.12.035
摘要
Conductive hydrogels present great potential in bioelectronics, ionotronic devices, and electronic skin. However, the creeping and plastic deformation of hydrogel often lead to poor stability and low reliability in applications. Here, we report a highly elastic conductive hydrogel based on crosslinked carbon nanotubes (CNT) and poly(vinyl alcohol) (PVA). With the formation of double crosslinking interactions, i.e., strong interaction from covalent acetal bonds and weak interaction from hydrogen bonds, CNT-PVA networks exhibit good stretchability (fracture stain up to 500%), rapid recovery, zero-residual deformation, and excellent mechanical stability. As such, the electromechanical response of this dual-crosslinked conductive hydrogel is stable and repeatable for a wide range of loading rates. Benefiting from the abundant hydroxyl groups and reversible acetal linking bridges in hydrogel networks, the prepared conductive hydrogel is not only repairable at room temperature, but also recyclable.
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