Wang Ting, Qiu Zhiguang, Li Haichuan, Lu Hao, Gu Yifan, Zhu Simu, Liu Gui-Shi, Yang Bo-Ru
State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-Sen University, Guangzhou, 510006, China.
Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Key Laboratory of Visible Light Communications of Guangzhou, Key Laboratory of Optoelectronic Information and Sensing Technologies of Guangdong Higher Education Institutes, College of Science & Engineering, Department of Optoelectronic Engineering, Jinan University, Guangzhou, 510632, China.
Small. 2023 Dec;19(50):e2304033. doi: 10.1002/smll.202304033. Epub 2023 Aug 30.
Stretchable strain sensors suffer the trade-off between sensitivity and linear sensing range. Developing sensors with both high sensitivity and wide linear range remains a formidable challenge. Different from conventional methods that rely on the structure design of sensing nanomaterial or substrate, here a heterogeneous-surface strategy for silver nanowires (AgNWs) and MXene is proposed to construct a hierarchical microcrack (HMC) strain sensor. The heterogeneous surface with distinct differences in cracks and adhesion strengths divides the sensor into two regions. One region contributes to high sensitivity through penetrating microcracks of the AgNW/MXene composite film during stretching. The other region maintains conductive percolation pathways to provide a wide linear sensing range through network microcracks. As a result, the HMC sensor exhibits ultrahigh sensitivity (gauge factor ≈ 244), broad linear range (ɛ = 60%, R ≈ 99.25%), and fast response time (<30 ms). These merits are confirmed in the detection of large and subtle human motions and digital joint movement for Morse coding. The manipulation of cracks on the heterogeneous surface provides a new paradigm for designing high-performance stretchable strain sensors.
可拉伸应变传感器在灵敏度和线性传感范围之间存在权衡。开发同时具有高灵敏度和宽线性范围的传感器仍然是一项艰巨的挑战。与依赖传感纳米材料或基底结构设计的传统方法不同，本文提出了一种用于银纳米线（AgNWs）和MXene的异质表面策略，以构建一种分级微裂纹（HMC）应变传感器。具有明显裂纹和粘附强度差异的异质表面将传感器分为两个区域。一个区域通过在拉伸过程中穿透AgNW/MXene复合膜的微裂纹来实现高灵敏度。另一个区域通过网络微裂纹维持导电渗流路径以提供宽线性传感范围。结果，HMC传感器表现出超高灵敏度（应变片系数≈244）、宽线性范围（ɛ = 60%，R≈99.25%）和快速响应时间（<30毫秒）。这些优点在检测大的和细微的人体运动以及用于摩尔斯编码的数字关节运动中得到了证实。对异质表面上裂纹的操控为设计高性能可拉伸应变传感器提供了一种新的范例。
