Self‐Assembled Magnetic Nanoparticles on Ag Nanowires and Polyurethane Composites for Sensitive and Flexible Piezo‐Resistive Sensors
Date
2025
Authors
Tran, T.T.
Lao, T.D.
Huyen Le, T.A.
Tung, T.T.
Sang, N.X.
Losic, D.
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Advisors
Journal Title
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Journal article
Citation
Macromolecular Materials and Engineering, 2025; e00313-1-e00313-10
Statement of Responsibility
Thanh T Tran, Thuan Duc Lao, Thuy Ai Huyen Le, Tran Thanh Tung, Nguyen Xuan Sang, Dusan Losic
Conference Name
Abstract
Flexible strain sensors face persistent challenges, including achieving high sensitivity, mechanical durability, and reliable performance under low pressures. To address these issues, we developed a conductive polymer nanocomposite composed of magnetic (Fe₃O₄) nanoparticles assembled on silver nanowires (Fe₃O₄@Ag NWs) embedded in a thermoplastic polyurethane (TPU) matrix. TPU provides mechanical flexibility, while polyvinylpyrrolidone (PVP) assists the magnetic self-assembly of Fe₃O₄ nanoparticles onto Ag NWs, forming a highly interconnected network. When used as a piezoresistive sensor, the material shows a ∼60% resistance change at 8 kPa, six times higher than its non-aligned counterpart, and excellent sensing response even at low pressures (0.2 kPa). This enhanced sensitivity is attributed to nanoparticle alignment and improved interfacial interactions, which increase conductive pathway density and enable efficient stress transfer. These results demonstrate the potential of this nanocomposite for next-generation flexible, wearable, and ultrasensitive electronic and biomedical sensing applications.
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© 2025 The Author(s). Macromolecular Materials and Engineering published by Wiley-VCH Gm. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.