School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, Wuhan 430070, China.
School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China.
Biomacromolecules. 2022 Jan 10;23(1):182-195. doi: 10.1021/acs.biomac.1c01203. Epub 2021 Dec 10.
Electronic skin has aroused extensive research interest due to high similarity with human skin. Realizing a multifunctional electronic skin that is highly consistent with skin functions and endowed with more other functions is now a more urgent need and important challenge. Here, we use 2,2,6,6-tetramethylpiperidinyl-1-oxyl (TEMPO)-oxidized cellulose nanofibril (TOCN) dispersion and highly conductive TiCT dispersion to prepare TOCN/TiCT composite film through vacuum-assisted filtration. The obtained composite film imitating the nacre-like lamellar structure of natural shells has good mechanical properties (124.6 MPa of tensile strength). Meanwhile, the composite film also showed excellent electromagnetic shielding performance (36 dB), biocompatibility, and antibacterial properties. In addition, the piezoresistive sensor assembled from the composite film exhibited a high sensitivity (11.6 kPa), fast response and recovery time (≤10 ms), ultralow monitoring limit (0.2 Pa), and long-term stability (>10 000 cycles). It also could detect human daily activities such as finger bent, chewing, and so on.
电子皮肤因其与人体皮肤高度相似而引起了广泛的研究兴趣。实现与皮肤功能高度一致且具有更多其他功能的多功能电子皮肤，是目前更为迫切的需求和重要挑战。在这里，我们使用 2,2,6,6-四甲基哌啶-1-氧基（TEMPO）氧化纤维素纳米纤维（TOCN）分散体和高导电性 TiCT 分散体，通过真空辅助过滤制备 TOCN/TiCT 复合膜。所获得的复合膜模仿天然贝壳的珍珠层状层状结构，具有良好的机械性能（拉伸强度为 124.6 MPa）。同时，该复合膜还表现出优异的电磁屏蔽性能（36 dB）、生物相容性和抗菌性能。此外，由复合膜组装而成的压阻式传感器表现出高灵敏度（11.6 kPa）、快速的响应和恢复时间（≤10 ms）、超低的监测下限（0.2 Pa）和长期稳定性（>10000 次循环）。它还可以检测人类日常活动，如手指弯曲、咀嚼等。
