Li Yuxiang, He Tengyu, Shi Liangjing, Wang Ranran, Sun Jing
State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Ding Xi Road, Shanghai 200050, P. R. China.
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing 100049, P. R. China.
ACS Appl Mater Interfaces. 2020 Apr 15;12(15):17691-17698. doi: 10.1021/acsami.9b21921. Epub 2020 Apr 1.
Recent years have witnessed significant development of flexible strain sensors in a variety of fields. Nevertheless, the challenge of integrating a broad sensing range (>50%) with high sensitivity [gauge factor (GF) value > 100 over the entire sensing strain] in one single flexible strain sensor still exists. Herein, we prepared a flexible strain sensor based on braided graphene belts (BGBs) and dragon skin. Such a BGB strain sensor exhibits an integration of a wide sensing range (up to 55.55%) and high sensitivity (GF value > 175.16 through the entire working range). Besides, this BGB strain sensor also demonstrates a minute monitoring limit (0.01%), low hysteresis and overshoot behaviors, and reliable cycling repeatability (>6000 cycles). The SEM microscopy observations reveal that the skew angle and intersection regions of graphene belts are mainly responsible for the desirable sensing performance. Finally, the successful detection of full-range human motions, from subtle actions to vigorously joint-related movements, reflects great potential of the BGB strain sensor in the application of wearable instruments.
近年来，柔性应变传感器在各个领域都取得了显著发展。然而，在单个柔性应变传感器中集成宽传感范围（>50%）和高灵敏度[在整个传感应变范围内应变片系数（GF）值>100]的挑战依然存在。在此，我们制备了一种基于编织石墨烯带（BGB）和龙皮的柔性应变传感器。这种BGB应变传感器具有宽传感范围（高达55.55%）和高灵敏度（在整个工作范围内GF值>175.16）的集成特性。此外，这种BGB应变传感器还具有微小的监测极限（0.01%）、低滞后和过冲行为以及可靠的循环重复性（>6000次循环）。扫描电子显微镜观察表明，石墨烯带的倾斜角度和交叉区域是实现理想传感性能的主要原因。最后，从细微动作到剧烈的关节相关运动，该BGB应变传感器成功检测了全范围的人体运动，这反映出其在可穿戴设备应用中的巨大潜力。
