Human skin is highly stretchable at low strain but becomes self-limiting when deformed at large strain due to stiffening caused by alignment of a network of stiff collagen nanofibers inside the tissue beneath the epidermis. To imitate this mechanical behavior and the sensory function of human skin, we fabricated a skin-like substrate with highly stretchable, transparent, tough, ultrathin, mechanosensory, and self-limiting properties by incorporating piezoelectric crystalline poly((vinylidene fluoride)-co-trifluoroethylene) (P(VDF-TrFE)) nanofibers with a high modulus into the low modulus matrix of elastomeric poly(dimethylsiloxane). Randomly distributed P(VDF-TrFE) nanofibers in the elastomer matrix conferred a self-limiting property to the skin-like substrate so that it can easily stretch at low strain but swiftly counteract rupturing in response to stretching. The stretchability, toughness, and Young’s modulus of the ultrathin (∼62 μm) skin-like substrate with high optical transparency could be tuned by controlling the loading of nanofibers. Moreover, the ultrathin skin-like substrate with a stretchable temperature sensor fabricated on it demonstrated the ability to accommodate bodily motion-induced strain in the sensor while maintaining its mechanosensory and thermosensory functionalities.

中文翻译：

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可拉伸电子产品的可拉伸，透明，坚韧，超薄且自限的皮肤状基材

人体皮肤在低应变下可高度拉伸，但在大应变下变形时会由于表皮下组织内部硬质胶原纳米纤维网络对准而引起的变硬而变得自我限制。模仿这种机械行为和人类皮肤的感觉功能，我们通过将压电结晶聚（偏二氟乙烯制成的皮肤状的基板具有高拉伸的，透明的，坚韧的，超薄，机械感觉，和自限性-共具有高模量的（三氟乙烯）（P（VDF-TrFE））纳米纤维进入弹性体聚（二甲基硅氧烷）的低模量基质。弹性体基质中无规分布的P（VDF-TrFE）纳米纤维赋予皮肤状基质以自限性，因此它可以很容易地在低应变下拉伸，但可以迅速抵抗拉伸而破裂。可以通过控制纳米纤维的负载量来调整具有高光学透明性的超薄（〜62μm）皮肤状基材的拉伸性，韧性和杨氏模量。此外，其上制造了具有可拉伸温度传感器的超薄皮肤样基材，展示了在保持其机械感官和热敏功能的同时，适应人体运动引起的应变的能力。