Ag–thiolate interactions to enable an ultrasensitive and stretchable MXene strain sensor with high temporospatial resolution

Yang Liu (), Zijun Xu, Xinyi Ji, Xin Xu, Fei Chen, Xiaosen Pan, Zhiqiang Fu, Yunzhi Chen, Zhengjian Zhang, Hongbin Liu, Bowen Cheng () and Jiajie Liang ()
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Yang Liu: Tianjin University of Science and Technology
Zijun Xu: Tianjin University of Science and Technology
Xinyi Ji: Nankai University
Xin Xu: Tianjin University of Science and Technology
Fei Chen: Tianjin University of Science and Technology
Xiaosen Pan: Tianjin University of Science and Technology
Zhiqiang Fu: Tianjin University of Science and Technology
Yunzhi Chen: Tianjin University of Science and Technology
Zhengjian Zhang: Tianjin University of Science and Technology
Hongbin Liu: Tianjin University of Science and Technology
Bowen Cheng: Tianjin University of Science and Technology
Jiajie Liang: Nankai University

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract High-sensitivity strain sensing elements with a wide strain range, fast response, high stability, and small sensing areas are desirable for constructing strain sensor arrays with high temporospatial resolution. However, current strain sensors rely on crack-based conductive materials having an inherent tradeoff between their sensing area and performance. Here, we present a molecular-level crack modulation strategy in which we use layer-by-layer assembly to introduce strong, dynamic, and reversible coordination bonds in an MXene and silver nanowire-matrixed conductive film. We use this approach to fabricate a crack-based stretchable strain sensor with a very small sensing area (0.25 mm2). It also exhibits an ultrawide working strain range (0.001–37%), high sensitivity (gauge factor ~500 at 0.001% and >150,000 at 35%), fast response time, low hysteresis, and excellent long-term stability. Based on this high-performance sensing element and facile assembly process, a stretchable strain sensor array with a device density of 100 sensors per cm2 is realized. We demonstrate the practical use of the high-density strain sensor array as a multichannel pulse sensing system for monitoring pulses in terms of their spatiotemporal resolution.

Date: 2024
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DOI: 10.1038/s41467-024-49787-9

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