Biomimetic Electronic Skin through Hierarchical Polymer Structural Design,Advanced Science

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Biomimetic Electronic Skin through Hierarchical Polymer Structural Design
Advanced Science ( IF 14.3 ) Pub Date : 2023-12-10 , DOI: 10.1002/advs.202309006
Mengnan Zhang ₁ , Shu Gong ₂ , Karen Hakobyan ₁ , Ziyan Gao ₃ , Zeyu Shao ₁ , Shuhua Peng ₃ , Shuying Wu ₄ , Xiaojing Hao ₅ , Zhen Jiang ₆ , Edgar H Wong ₁ , Kang Liang ₇ , Chun H Wang ₃ , Wenlong Cheng ₂ , Jiangtao Xu ₁

Affiliation

Human skin comprises multiple hierarchical layers that perform various functions such as protection, sensing, and structural support. Developing electronic skin (E-skin) with similar properties has broad implications in health monitoring, prosthetics, and soft robotics. While previous efforts have predominantly concentrated on sensory capabilities, this study introduces a hierarchical polymer system that not only structurally resembles the epidermis-dermis bilayer structure of skin but also encompasses sensing functions. The system comprises a polymeric hydrogel, representing the “dermis”, and a superimposed nanoporous polymer film, forming the “epidermis”. Within the film, interconnected nanoparticles mimic the arrangement of interlocked corneocytes within the epidermis. The fabrication process employs a robust in situ interfacial precipitation polymerization of specific water-soluble monomers that become insoluble during polymerization. This process yields a hybrid layer establishing a durable interface between the film and hydrogel. Beyond the structural mimicry, this hierarchical structure offers functionalities resembling human skin, which includes (1) water loss protection of hydrogel by tailoring the hydrophobicity of the upper polymer film; (2) tactile sensing capability via self-powered triboelectric nanogenerators; (3) built-in gold nanowire-based resistive sensor toward temperature and pressure sensing. This hierarchical polymeric approach represents a potent strategy to replicate both the structure and functions of human skin in synthetic designs.

中文翻译：

通过分层聚合物结构设计实现仿生电子皮肤

人体皮肤由多个分层层组成，执行各种功能，例如保护、传感和结构支撑。开发具有相似特性的电子皮肤（E-skin）在健康监测、假肢和软机器人技术方面具有广泛的意义。虽然以前的工作主要集中在感觉能力上，但这项研究引入了一种分层聚合物系统，该系统不仅在结构上类似于皮肤的表皮-真皮双层结构，而且还包含传感功能。该系统包括代表“真皮”的聚合物水凝胶和形成“表皮”的叠加纳米多孔聚合物膜。在薄膜内，互连的纳米颗粒模拟了表皮内互锁的角质细胞的排列。该制造工艺采用特定的水溶性单体的稳健原位界面沉淀聚合，这些单体在聚合过程中变得不溶。这个过程产生了一个混合层，在薄膜和水凝胶之间建立了一个持久的界面。除了结构模拟之外，这种分层结构还提供类似于人体皮肤的功能，其中包括（1）通过定制上层聚合物膜的疏水性来保护水凝胶的水分流失;（2）通过自供电摩擦纳米发电机实现触觉传感能力;（3）内置基于金纳米线的电阻传感器，用于温度和压力传感。这种分层聚合物方法代表了在合成设计中复制人类皮肤结构和功能的有效策略。

更新日期：2023-12-10

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