Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry , Beijing Normal University , Beijing 100875 , P. R. China.
Beijing Graphene Institute , Beijing 100094 , P. R. China.
ACS Appl Mater Interfaces. 2020 Jan 8;12(1):1486-1494. doi: 10.1021/acsami.9b17354. Epub 2019 Dec 12.
Stretchable conductors have been achieved by stacking conductive nanomaterials onto the surfaces of elastomeric substrates. However, many of them show a dramatic decrease in conductivity under strain without an efficient way for the conductive layer to release strain. Here, we report a transparent, stretchable, and self-healing conductor with excellent mechanoelectrical stability by introducing dynamic bonding between conductive nanomaterials and an elastomeric substrate. We prepare the conductor by semiembedding Ag nanowires (AgNWs) into a self-healing polydimethylsiloxane (PDMS)-based elastomer, which is modified with bipyridine (Bpy) ligand and further cross-linked by adding Zn as coordinator (Zn-Bpy-PDMS). The dynamic Ag-N bonds not only improve the wettability of the substrate and facilitate the spreading of AgNWs but also reversibly break and reform to accommodate the deformation of AgNWs. As a result, the resistance increase of Zn-Bpy-PDMS/AgNWs is much smaller than that without the dynamic bonding (PDMS/AgNWs). Besides, this conductor exhibits excellent conductivity (76.2 Ω/sq) and transparency (86.6% @ 550 nm), as well as extraordinary self-healing property with a low resistance increase (Δ/ ∼ 1.4) after healing at room temperature for 1 day. This work provides insights into the future design of integrated electronic skin with transparency, stretchability, conductivity, and self-healing capability for applications in wearable optoelectronic devices.
通过将导电纳米材料堆叠在弹性体基底的表面上，可以实现可拉伸导体。然而，许多可拉伸导体在应变下的导电性会急剧下降，而没有有效的方法来释放导电层的应变。在这里，我们通过在导电纳米材料和弹性体基底之间引入动态键合，报告了一种具有透明性、可拉伸性和自修复性的导体，具有出色的机电稳定性。我们通过将银纳米线（AgNWs）半嵌入自修复聚二甲基硅氧烷（PDMS）基弹性体中来制备导体，该弹性体用联吡啶（Bpy）配体进行修饰，并通过添加 Zn 作为配位剂（Zn-Bpy-PDMS）进一步交联。动态 Ag-N 键不仅改善了基底的润湿性并促进了 AgNWs 的扩展，而且还可以可逆地断裂和重新形成以适应 AgNWs 的变形。结果，Zn-Bpy-PDMS/AgNWs 的电阻增加比没有动态键合的情况（PDMS/AgNWs）小得多。此外，这种导体表现出出色的导电性（76.2 Ω/sq）和透明度（86.6% @ 550nm），以及非凡的自修复性能，在室温下自愈 1 天后电阻增加率低（Δ/ ∼ 1.4）。这项工作为设计具有透明度、可拉伸性、导电性和自修复能力的集成电子皮肤提供了新的思路，可应用于可穿戴光电设备。
