Highly conductive, stretchable and biocompatible Ag-Au core-sheath nanowire composite for wearable and implantable bioelectronics
Highly conductive, stretchable and biocompatible Ag-Au core-sheath nanowire composite for wearable and implantable bioelectronics
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DOI：
10.1038/s41565-018-0226-8
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发表时间：
2018-11-01
影响因子：
38.3
通讯作者：
Kim, Dae-Hyeong
中科院分区：
文献类型：
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作者：
Choi, Suji;Han, Sang Ihn;Kim, Dae-Hyeong
可穿戴和可植入设备需要导电、可拉伸和生物相容性材料。然而，获得同时满足这些要求的复合材料是具有挑战性的，这是由于导电性和拉伸性之间的权衡。在这里，我们报告的银-金纳米复合材料组成的超长金涂层银纳米线的弹性嵌段共聚物矩阵。由于Ag-Au纳米线的高纵横比和渗滤网络，纳米复合材料表现出41，850 S cm（-1）（最大72，600 S cm（-1））的最佳电导率。在溶剂干燥过程中，Ag-Au纳米复合材料中的相分离产生了一种微结构，该微结构产生了266%的最佳拉伸性（最大为840%）。沉积在银纳米线表面上的厚金鞘防止氧化和银离子浸出，使得复合材料具有生物相容性和高导电性。使用该纳米复合材料，我们成功地制造了可穿戴和可植入的软生物电子器件，该器件可以与人的皮肤和猪的心脏共形地集成，用于连续的电生理记录以及电刺激和热刺激。
Wearable and implantable devices require conductive, stretchable and biocompatible materials. However, obtaining composites that simultaneously fulfil these requirements is challenging due to a trade-off between conductivity and stretchability. Here, we report on Ag-Au nanocomposites composed of ultralong gold-coated silver nanowires in an elastomeric block-copolymer matrix. Owing to the high aspect ratio and percolation network of the Ag-Au nanowires, the nanocomposites exhibit an optimized conductivity of 41,850 S cm(-1) (maximum of 72,600 S cm(-1)). Phase separation in the Ag-Au nanocomposite during the solvent-drying process generates a microstructure that yields an optimized stretchability of 266% (maximum of 840%). The thick gold sheath deposited on the silver nanowire surface prevents oxidation and silver ion leaching, making the composite biocompatible and highly conductive. Using the nanocomposite, we successfully fabricate wearable and implantable soft bioelectronic devices that can be conformally integrated with human skin and swine heart for continuous electrophysiological recording, and electrical and thermal stimulation.