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High Performance Flexible Strain Sensors Based On Silver Nanowires/thermoplastic Polyurethane Composites for Wearable Devices

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Abstract

Flexible strain sensors have attracted numerous attentions due to their application in wearable devices. However, it is still a significant challenge to fabricate flexible strain sensors with both wide sensing range and high sensitivity simultaneously. In this article, this challenge had been addressed by using ultralong silver nanowires (AgNWs) to composite with stretchable thermoplastic polyurethane (TPU). Benefitted by the ultralong AgNWs, stretchable TPU and the hydrogen bond interaction between TPU and PVP on the surface of the ultralong AgNWs, the AgNWs/TPU composite flexible strain sensor with wide sensing range and high sensitivity simultaneously was achieved. The obtained AgNWs/TPU composite flexible strain sensor possessed wide sensing range above 250% with high gauge factor (GF) of 329.43 and excellent stability. The sensing range and GF of the obtained AgNWs/TPU composite flexible strain sensor were higher than those of other similar flexible strain sensor reported in the literature. The response and recovery times were about 100 and 300 ms, respectively. The AgNWs/TPU composite flexible strain sensor could be used to detect human motions such as finger, wrist, elbow, and knee bending as well as facial expressions and micro-acoustic vibrations. The AgNWs/TPU composite flexible strain sensor demonstrates excellent potential for applications in wearable device.

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All data generated or analysed during this study are included in this published article (and its supplementary information files).

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Acknowledgements

This work was supported by the European Union (European Structural and Investment Funds–Operational Programme Research, Development and Education) in the frames of the project “Modular platform for autonomous chassis of specialized electric vehicles for freight and equipment transportation”, Reg. No. CZ.02.1.01/0.0/0.0/16_025/0007293, and Fundation of Zhejiang Sci-Tech University (No. LW-YP2020006). We would like to thank the anonymous reviewers for their valuable comments.

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Authors and Affiliations

  1. Engineering Research Center for Eco-Dyeing and Finishing of Textiles, Zhejiang Sci-Tech University, Zhejiang, 310018, China

    Lu Zhang, Lili Wang, Yikai Feng, Deyou Yu & Minghua Wu

  2. Key Laboratory of Advanced Textile Materials and Manufacturing Technology, Ministry of Education, College of Textile Science and Engineering (International Institute of Silk), Zhejiang Sci-Tech University, Zhejiang, 310018, China

    Lu Zhang, Lili Wang, Yikai Feng, Deyou Yu & Minghua Wu

  3. Drug and Product Quality Control, Jiaxing Institute for Food, Zhejiang, 314001, China

    Fuliang Jiang

  4. Institute for Nanomaterials, Advanced Technologies and Innovation, Technical University of Liberec, 461 17, Liberec, Czech Republic

    Tao Yang & Michal Petru

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  1. Lu Zhang
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Correspondence to Minghua Wu.

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Highlights

• Hydrogen-bond interaction between TPU and PVP on the surface of ultralong AgNWs was utilized to fabricate flexible strain sensor.

• The flexible strain sensor possessed wide sensing range, high gauge factor of 329.43, and excellent stability.

• The response/recovery time was about 100 and 300 ms, respectively.

• The stretching mechanism of AgNWs/TPU composite flexible strain sensor was discussed.

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Zhang, L., Jiang, F., Wang, L. et al. High Performance Flexible Strain Sensors Based On Silver Nanowires/thermoplastic Polyurethane Composites for Wearable Devices. Appl Compos Mater 29, 1621–1636 (2022). https://doi.org/10.1007/s10443-022-10029-0

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