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首页> 外文期刊>ACS applied materials & interfaces >Significant Stretchability Enhancement of a Crack-Based Strain Sensor Combined with High Sensitivity and Superior Durability for Motion Monitoring
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Significant Stretchability Enhancement of a Crack-Based Strain Sensor Combined with High Sensitivity and Superior Durability for Motion Monitoring

机译：基于裂缝的应变传感器的显着拉伸性，结合高灵敏度和运动监测耐用性

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摘要

Flexible strain sensors have attracted tremendous interest due to their potential application as intelligent wearable sensing devices. Among them, crack-based flexible strain sensors have been studied extensively owing to their ultrahigh sensitivity. Nevertheless, the detection range of a crack-based sensor is quite narrow, limiting its application. In this work, a stretchable strain sensor based on a designed crack structure was fabricated by spray-coating carbon nanotube (CNT) ink onto an electrospun thermoplastic polyurethane (TPU) fibrous mat and prestretching treatment to overcome the trade-off relationship. Our sensor exhibited combined features of high sensitivity in a greatly widened workable sensing range [a gauge factor of 428.5 within 100% strain, 9268.8 for a strain of 100-220%, and larger than 83982.8 for a strain of 220-300%], a fast response time (about 70 ms), superior durability (10 000 stretching-releasing cycles), and excellent response toward bending. The microstructural evolution of CNT branches extending from two edges of the cracks and the excellent stretchability of TPU fibrous mats are mainly related to the remarkable sensing properties. Our sensor is then assembled to detect various human motions and physical vibrational signals, demonstrating its potential applications in intelligent devices, electronic skins, and wearable healthcare monitors.
机译：由于其潜在应用是智能可穿戴传感设备的潜在应用，柔性应变传感器引起了巨大的兴趣。其中，由于其超高敏感性，已经在广泛研究了基于裂缝的柔性应变传感器。然而，基于裂缝的传感器的检测范围非常窄，限制其应用。在这项工作中，通过将碳纳米管（CNT）墨水喷涂到电纺出热塑性聚氨酯（TPU）纤维垫上并以克拉茨化治疗来制造基于设计裂缝结构的可拉伸应变传感器，以克服权衡关系。我们的传感器在大大加宽的可行性传感范围内显示出高灵敏度的综合特征[尺寸因子428.5，在100％菌株内，9268.8株为100-220％，大于83982.8的菌株为220-300％]，快速响应时间（约70毫秒），卓越的耐久性（＆ 10 000个拉伸释放循环），以及对弯曲的优异反应。从裂缝的两个边缘延伸的CNT分支的微观结构演化和TPU纤维垫的优异拉伸性主要与显着的感测性质有关。然后，我们的传感器组装以检测各种人类运动和物理振动信号，证明其在智能设备，电子皮肤和可穿戴医疗监视器中的潜在应用。

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