Preparation and characterization of conductive and stretchable MXene-based nanocomposite hydrogels initiated by metal ions

自愈水凝胶 材料科学 电导率 导电体 纳米复合材料 导电聚合物 电子皮肤 乙烯醇 水溶液中的金属离子 弹性(材料科学) 纳米技术 离子 聚合物 化学工程 复合材料 高分子化学 金属 化学 物理化学 有机化学 工程类 冶金
作者
Yuxing Ji,Zhijie Geng,Shan Yu
标识
DOI:10.1142/s2737599423400078
摘要

Conductive hydrogels are emerging as an advanced electronic platform for wearable sensors by synergizing the advantageous features of conductivity and flexibility. Especially conductive polymer hydrogels have widespread applications in the fields of catalysis, biomedicine, monitoring, and wearable electronic skin owing to the outstanding strain sensitivity and resilience thereof. Nevertheless, how to maintain the conductivity of hydrogels and electronic skins under strain or deformation remains a significant challenge. To tackle the said bottleneck, a multiple H-bonding MXene-based conductive hydrogel was established in the present study. With the participation of MXene and Fe[Formula: see text] ions, the hydrogel network was strengthened, which might be attributed to the H-bonding among the polymer chain, MXene, and Fe[Formula: see text] ions. Meanwhile, the elongation at break and compression modulus of Poly(vinyl alcohol) (PVA)- M3F hydrogels increased to 513% and 85.6[Formula: see text]kPa compared with the initial PVA hydrogel, respectively. After incorporating Fe[Formula: see text] ions, the PVA-M3F hydrogels exhibited greater conductivity, which was [Formula: see text][Formula: see text]S/cm. Notably, the PVA-M3F hydrogels displayed good resilience, leading to stable conductivity and strain sensitivity. Subsequently, a finger joint was designed to verify the maintenance of conductivity and monitoring behaviors. PVA-M3F conductive hydrogel was found to possess an outstanding capability for electrical signals feedback and was expected to be applied to electronic sensors or monitors. In summary, the introduction of MXene and Fe[Formula: see text] ions into PVA hydrogels can not only tune the conductivity but also have promising prospects as a countermeasure for wearable electronics.
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