Mimicking the skin's non‐linear self‐limiting mechanical characteristics is of great interest. Skin is soft at low strain but becomes stiff at high strain and thereby can protect human tissues and organs from high mechanical loads. Herein, the design of a skin‐inspired substrate is reported based on a spaghetti‐like multi‐nanofiber network (SMNN) of elastic polyurethane (PU) nanofibers (NFs) sandwiched between stiff poly(vinyldenefluoride‐co‐trifluoroethylene) (P(VDF‐TrFE)) NFs layers embedded in polydimethylsiloxane elastomer. The elastic moduli of the stretchable skin‐inspired substrate can be tuned in a range that matches well with the mechanical properties of skins by adjusting the loading ratios of the two NFs. Confocal imaging under stretching indicates that PU NFs help maintain the stretchability while adding stiff P(VDF‐TrFE) NFs to control the self‐limiting characteristics. Interestingly, the Au layer on the substrate indicates a negligible change in the resistance under cyclic (up to 7000 cycles at 35% strain) and dynamic stretching (up to 35% strain), which indicates the effective absorption of stress by the SMNN. A stretchable chemoresistive gas sensor on the skin‐inspired substrate also demonstrates a reasonable stability in NO₂ sensing response under strain up to 30%. The skin‐inspired substrate with SMNN provides a step toward ultrathin stretchable electronics.

中文翻译：

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皮肤启发性基底，具有类似意粉的类似多纳米纤维的可伸缩电子元件的刚性和弹性组件网络

模仿皮肤的非线性自限机械特性引起了极大的兴趣。皮肤在低应变时会变软，但在高应变时会变硬，因此可以保护人体组织和器官免受高机械负荷。在此，皮肤启发基板的设计是基于意大利面条状夹持硬聚之间的多纳米纤维网络的弹性聚氨酯（SMNN）（PU）的纳米纤维（NFS）报道的（vinyldenefluoride-共-三氟乙烯）（P（VDF-TrFE））NFs层嵌入聚二甲基硅氧烷弹性体中。可以通过调节两个NF的负载比，在与皮肤的机械性能完全匹配的范围内调整可拉伸皮肤启发基材的弹性模量。拉伸下的共聚焦成像表明，PU NFs有助于保持拉伸性，同时添加刚性P（VDF-TrFE）NFs可控制自限性。有趣的是，基板上的Au层表明在循环（35％应变下最多7000个循环）和动态拉伸（高达35％应变）下电阻的变化可忽略不计，这表明SMNN有效地吸收了应力。受皮肤启发的基材上的可拉伸化学电阻气体传感器也显示出对NO ₂的合理稳定性应变高达30％时的感应响应。带有SMNN的受皮肤启发的基材向超薄可拉伸电子产品迈出了一步。