Significant Stretchability Enhancement of a Crack-Based Strain Sensor Combined with High Sensitivity and Superior Durability for Motion Monitoring
Significant Stretchability Enhancement of a Crack-Based Strain Sensor Combined with High Sensitivity and Superior Durability for Motion Monitoring
复制标题
基于裂纹的应变传感器的可拉伸性显着增强，同时具有高灵敏度和卓越的耐用性，适用于运动监测
DOI：
10.1021/acsami.8b20768
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发表时间：
2019
影响因子：
9.5
通讯作者：
Shen Changyu
中科院分区：
文献类型：
--
作者：
Zhou Yujie;Zhan Pengfei;Ren Miaoning;Zheng Guoqiang;Dai Kun;Mi Liwei;Liu Chuntai;Shen Changyu
柔性应变传感器作为智能可穿戴传感器件的潜在应用引起了人们极大的兴趣。其中，基于裂纹的柔性应变传感器由于其灵敏度高而得到了广泛的研究。然而，基于裂纹的传感器的检测范围相当窄，限制了其应用。在这项工作中，一个可拉伸的应变传感器的基础上设计的裂纹结构的制造通过喷涂碳纳米管（CNT）墨水到静电纺丝热塑性聚氨酯（TPU）纤维垫和预拉伸处理，以克服权衡关系。我们的传感器具有高灵敏度和宽量程的综合特性[应变范围为100%时的应变系数为428.5，应变为100- 220%时的应变系数为9268.8，应变为220-300%时的应变系数大于83982.8]，（约70 ms）、上级耐久性（> 10000次拉伸-释放循环）和对弯曲的优异响应。从裂纹两侧延伸的碳纳米管分支的微观结构演变和TPU纤维垫的优异拉伸性主要与显着的传感性能有关。我们的传感器，然后组装检测各种人体运动和物理振动信号，展示了其在智能设备，电子皮肤和可穿戴医疗监护仪的潜在应用。
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.