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    Dynamic Ag-N Bond Enhanced Stretchable Conductor for Transparent and Self-Healing Electronic Skin

    Year: 2020

    Journal: ACS Appl. Mater. Interfaces, Volume 12, JAN 8, page 1486–1494

    Authors: Ye, Guo; Song, Zizheng; Yu, Tianhao; Tan, Qishuo; Zhang, Yan; Chen, Tinglei; He, Changcheng; Jin, Lihua; Liu, Nan

    Organizations: Young Thousand Talents Program [110532103]; Beijing Normal University [310421109, 312232102]; Beijing Municipal Science & Technology CommissionBeijing Municipal Science & Technology Commission [Z191100000819002]; Fundamental Research Funds for the Central UniversitiesFundamental Research Funds for the Central Universities; Henry Samueli School of Engineering and Applied Science at the University of California, Los Angeles

    Keywords: stretchable conductor; dynamic bond; transparent; self-healing; electronic skin

    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 Zn2+ 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 Omega/sq) and transparency (86.6% @ 550 nm), as well as extraordinary self-healing property with a low resistance increase (Delta R/R-0 similar to 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.
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