Highly stretchable strain sensors with high sensitivity, wide sensing range, and high durability have broader application prospects in the fields of wearable sensors, electronic skin, and soft robots. However, it is still challenging to fabricate strain sensors with high sensitivity, wide working range, excellent durability, and antibacterial properties. Herein, a highly stretchable and porous thermoplastic polyurethane/carbon nanotube@silver nanoparticles (TPU/CNT@AgNPs) strain sensor was facilely prepared by electrospinning combined with dip coating CNT and reduction of AgNO₃. The TPU/CNT@AgNPs strain sensor exhibited high sensitivity (the maximum gauge factor of 930), favorable conductivity (539.7 S m⁻¹), wide sensing range (0.1 ~ 500% strain), a fast response time (100 ms at 1% strain), high dynamic response performance (2400 mm/min), air permeability, and antibacterial activity, due to the synergetic effect of the multi-conductive network between CNT and AgNPs. Benefiting from the in situ generated AgNPs and the π–π interaction between the benzene ring structure of TPU and CNT, the TPU/CNT@AgNPs strain sensor exhibited excellent durability (1400 cycles for 200% strain) and could work even after being immersed in harsh conditions (acidic and alkaline solution). Besides, the strain sensor can be successfully employed in monitoring human motion from tiny pulse beats to large bending movements of fingers, wrists, and knees. This work provides a feasible approach to preparing a strain sensor with outstanding overall performance, which has a perspective and alluring application in the realm of wearable electronics.

Graphical Abstract

Highly stretchable TPU/CNT@AgNPs strain sensor with high sensitivity was prepared by dipping CNT and AgNPs reduction on electrospun TPU mat.

中文翻译：

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耐久耐洗可穿戴抗菌热塑性聚氨酯/碳纳米管@银纳米粒子电纺膜应变传感器通过多导电网络

高度可拉伸的应变传感器具有高灵敏度、宽传感范围和高耐用性，在可穿戴传感器、电子皮肤、软体机器人等领域具有更广阔的应用前景。然而，制造具有高灵敏度、宽工作范围、优异耐用性和抗菌性能的应变传感器仍然具有挑战性。_{在此，通过静电纺丝结合浸涂 CNT 和 AgNO 3}的还原，轻松制备了一种高度可拉伸和多孔的热塑性聚氨酯/碳纳米管@银纳米粒子 (TPU/CNT@AgNPs) 应变传感器。TPU/CNT@AgNPs 应变传感器表现出高灵敏度（最大应变系数 930）、良好的电导率（539.7 S m ^-1), 感测范围广(0.1 ~ 500%应变), 响应时间快(1%应变时100 ms), 高动态响应性能(2400 mm/min), 透气性和抗菌活性, 由于协同效应CNT 和 AgNPs 之间的多导电网络。得益于原位生成的 AgNPs 以及 TPU 和 CNT 苯环结构之间的 π-π 相互作用，TPU/CNT@AgNPs 应变传感器表现出优异的耐久性（1400 次循环，200% 应变），即使浸入水中也能正常工作苛刻的条件（酸性和碱性溶液）。此外，应变传感器可以成功地用于监测人体运动，从微小的脉搏跳动到手指、手腕和膝盖的大幅度弯曲运动。这项工作为制备具有出色综合性能的应变传感器提供了一种可行的方法，

图形概要

通过将 CNT 和 AgNPs 还原浸渍在电纺 TPU 垫上，制备了具有高灵敏度的高度可拉伸 TPU/CNT@AgNPs 应变传感器。