CAS Center for Excellence in Nanoscience, Beijing Key Laboratory of Micro-Nano Energy and Sensor , Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences , Beijing 100083 , China.
School of Nanoscience and Technology , University of Chinese Academy of Sciences , Beijing 100049 , China.
ACS Nano. 2018 Sep 25;12(9):9326-9332. doi: 10.1021/acsnano.8b04245. Epub 2018 Aug 27.
Recently emerged electronic skins with applications in on-body sensing and human-machine interfaces call for the development of high-performance skin-like electrodes. In this work, we report a highly robust, transparent, and breathable epidermal electrode composed of a scaffold-reinforced conductive nanonetwork (SRCN). Solution-dispersed Ag nanowires, through facile vacuum filtration, are embedded into a scaffold made of polyamide nanofibers. Optical transmittance of 84.9% at 550 nm wavelength is achieved at a significantly low sheet resistance of 8.2 Ω sq. The resistance of the SRCN only slightly increases by less than 0.1% after being bent for 3000 cycles at the maximum curvature of 300 m and by less than 1.5% after being dipped in saline solution for 2500 cycles. The excellent robustness is attributed to the reinforcement from the nanofiber-based scaffold as a backbone that maintains the connections among the Ag nanowires by undertaking most of the loaded stress. The SRCN not only forms tight and conformal bonding with the target surface but also allows the evaporation of perspiration, making it suitable as an epidermal electrode for long-time use. Furthermore, fine and clean-cut circuit patterns with a line width on the micrometer scale can be readily prepared, paving the way for fabricating sophisticated functional electronic skins.
最近出现的电子皮肤在体感和人机界面方面的应用需要开发高性能的类皮肤电极。在这项工作中，我们报告了一种高度坚固、透明和透气的表皮电极，它由一个支架增强的导电纳米网络 (SRCN) 组成。通过简单的真空过滤，将分散在溶液中的银纳米线嵌入到由聚酰胺纳米纤维制成的支架中。在 550nm 波长下，透光率达到 84.9%，而其面电阻仅为 8.2 Ω/sq。在最大曲率为 300m 的情况下弯曲 3000 次后，SRCN 的电阻仅增加了不到 0.1%，在盐溶液中浸泡 2500 次后电阻仅增加了不到 1.5%。优异的鲁棒性归因于基于纳米纤维的支架的增强作用，作为骨架，它通过承担大部分加载应力来保持银纳米线之间的连接。SRCN 不仅与目标表面形成紧密和贴合的结合，而且还允许汗水蒸发，因此适合作为长时间使用的表皮电极。此外，还可以很容易地制备出具有微米级线宽的精细和整洁的电路图案，为制造复杂的功能性电子皮肤铺平了道路。
