College of Chemistry and Chemical Engineering, Shaanxi University of Science & Technology, Xi'an, Shaanxi, 710021, China.
National Demonstration Center for Experimental Light Chemistry Engineering Education, Shaanxi University of Science & Technology, Xi'an, Shaanxi, 710021, China.
Adv Sci (Weinh). 2021 Aug;8(15):e2004377. doi: 10.1002/advs.202004377. Epub 2021 Jun 2.
For the practical applications of wearable electronic skin (e-skin), the multifunctional, self-powered, biodegradable, biocompatible, and breathable materials are needed to be assessed and tailored simultaneously. Integration of these features in flexible e-skin is highly desirable; however, it is challenging to construct an e-skin to meet the requirements of practical applications. Herein, a bio-inspired multifunctional e-skin with a multilayer nanostructure based on spider web and ant tentacle is constructed, which can collect biological energy through a triboelectric nanogenerator for the simultaneous detection of pressure, humidity, and temperature. Owing to the poly(vinyl alcohol)/poly(vinylidene fluoride) nanofibers spider web structure, internal bead-chain structure, and the collagen aggregate nanofibers based positive friction material, e-skin exhibits the highest pressure sensitivity (0.48 V kPa ) and high detection range (0-135 kPa). Synchronously, the nanofibers imitating the antennae of ants provide e-skin with short response and recovery time (16 and 25 s, respectively) to a wide humidity range (25-85% RH). The e-skin is demonstrated to exhibit temperature coefficient of resistance (TCR = 0.0075 °C ) in a range of the surrounding temperature (27-55 °C). Moreover, the natural collagen aggregate and the all-nanofibers structure ensure the biodegradability, biocompatibility, and breathability of the e-skin, showing great promise for practicability.
对于可穿戴电子皮肤（e-skin）的实际应用，需要评估和定制多功能、自供电、可生物降解、生物相容和透气的材料。在柔性 e-skin 中集成这些功能是非常理想的；然而，构建一个满足实际应用要求的 e-skin 具有挑战性。在此，构建了一种基于蜘蛛网和蚂蚁触角的多层纳米结构的仿生多功能 e-skin，它可以通过摩擦纳米发电机收集生物能量，同时检测压力、湿度和温度。由于聚（聚乙烯醇）/聚（偏二氟乙烯）纳米纤维蜘蛛网结构、内部珠链结构和基于胶原聚集的纳米纤维正摩擦材料，e-skin 表现出最高的压力灵敏度（0.48 V kPa）和高检测范围（0-135 kPa）。同时，模仿蚂蚁触角的纳米纤维为 e-skin 提供了短的响应和恢复时间（分别为 16 和 25 s），可检测宽湿度范围（25-85% RH）。e-skin 表现出电阻温度系数（TCR = 0.0075°C）在周围温度范围（27-55°C）内。此外，天然胶原聚集和全纳米纤维结构确保了 e-skin 的可生物降解性、生物相容性和透气性，显示出很大的实用性。
