High Sensitivity, Wide Linear-Range Strain Sensor Based on MXene/AgNW Composite Film with Hierarchical Microcrack

被引:48
作者
Wang, Ting [1 ]
Qiu, Zhiguang [1 ]
Li, Haichuan [2 ]
Lu, Hao [1 ]
Gu, Yifan [1 ]
Zhu, Simu [1 ]
Liu, Gui-Shi [2 ]
Yang, Bo-Ru [1 ]
机构
[1] Sun Yat Sen Univ, Sch Elect & Informat Technol, State Key Lab Optoelect Mat & Technol, Guangdong Prov Key Lab Display Mat & Technol, Guangzhou 510006, Peoples R China
[2] Jinan Univ, Guangdong Prov Key Lab Opt Fiber Sensing & Commun, Key Lab Visible Light Commun Guangzhou, Coll Sci & Engn,Guangdong Higher Educ Inst,Dept Op, Guangzhou 510632, Peoples R China
基金
中国国家自然科学基金; 中央高校基本科研业务费专项资金资助;
关键词
hierarchical microcracks; high sensitivity; linear sensing; MXene; silver nanowires; strain sensors; PRESSURE; FIBER;
D O I
10.1002/smll.202304033
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
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 approximate to 244), broad linear range (epsilon = 60%, R-2 approximate to 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
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页数:11
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