Adhesive aero-hydrogel hybrid conductor assembled from silver nanowire architectures

由银纳米线组装结构制备自粘性气-水凝胶复合导体

Conductive and adhesive hydrogels are promising materials for designing bioelectronics.To satisfy the high conductivity of bioelectronic devices,metal nanomaterials have been used to fabricate composite hydrogels.However,the fabrication of a conductive-nanomaterial-incorporated hydrogel with high performance is a great challenge because of the easy aggregation nature of conductive nanomaterials making processing difficult.Here,we report a kind of adhesive aero-hydrogel hybrid conductor(AAHC)with stretchable,adhesive and anti-bacteria properties by in situ formation of a hydrogel network in the aerogel-silver nanowires(AgNWs)assembly.The AgNWs with good conductivity are wellintegrated on the inner-surface of shape-memory chitosan aerogel,which created a conductive framework to allow hydrogel back-filling.Reinforcement by the aerogel-silver makes the hybrid hydrogel tough and stretchable.Functional groups from the hydrogel allow strong adhesion to wet tissues through molecular stitches.The inherent bacteria-killing ability of silver ions endows the conductive hydrogel with excellent anti-bacteria performance.The proposed facile strategy of aerogel-assisted assembly of metal nanomaterials with hydrogel opens a new route to incorporate functional nanoscale building blocks into hydrogels.

具有粘合性能的导电水凝胶是一种非常有前景的生物电子材料,其中金属纳米材料通常被用作添加材料以提高水凝胶的导电性.然而,由于纳米导电材料在水凝胶中极容易聚集,使得高导电率的金属纳米材料复合水凝胶难以制备.本文中,我们通过在壳聚糖-银纳米线复合气凝胶中原位形成水凝胶网络,设计并制备了一种可导电、可拉伸、可粘合、可抗菌的新型多功能水凝胶.高导电性能的银纳米线在具有形状记忆性能的气凝胶内表面集成为导电通路,并且气凝胶还对复合水凝胶起到增强、增韧的效果,银离子固有杀菌能力也使得该导电水凝胶具有优异的抗菌性能.最后,灌注在气凝胶中的水凝胶分子链上的活性官能团,使得复合水凝胶可以通过分子缝线牢固地结合在湿态生物组织表面.本文提出的这种气凝胶辅助导电水凝胶组装的新策略,为实现将功能单元与水凝胶组装及复合提供了一条新途径.