Tuning the electromechanical performance in piezoresistive composite strain sensors is primarily attained through appropriately employing the materials system and the fabrication process. High sensitivity along with flexibility in the strain sensing devices needs to be met according to the application (e.g. human motion detection, health and sports monitoring). In this paper, a highly stretchable and sensitive strain sensor with a low-cost fabrication is proposed which is acquired by embedding the chopped carbon fibers sandwiched in between silicone rubber layers. The electrical and mechanical features of the sensor were characterized through stretch/release loading tests where a considerably high sensitivity (the gauge factor about 100) was observed with very low hysteresis. This implies high strain reversibility (i.e. full recovery in each cycle) over 700 loading cycles. Moreover, the sensors exhibited ultra-high stretchability (up to ∼300% elongation) in addition to a low stiffness meaning minimal mechanical effects induced by the sensor for sensitive human motion monitoring applications including large and small deformations. The results suggest the promising capability of the present sensor in reflecting the human body motion detection.

中文翻译：

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基于夹在硅橡胶层之间的短切碳纤维的高灵敏度和可拉伸应变传感器，用于人体运动检测

调整压阻复合应变传感器的机电性能主要是通过适当采用材料系统和制造工艺来实现的。根据应用（例如人体运动检测、健康和运动监测），需要满足应变传感设备的高灵敏度和灵活性。在本文中，提出了一种低成本制造的高度可拉伸和灵敏的应变传感器，该传感器是通过嵌入夹在硅橡胶层之间的短切碳纤维来获得的。传感器的电气和机械特性通过拉伸/释放负载测试进行表征，其中观察到相当高的灵敏度（应变系数约为 100）和非常低的滞后。这意味着高应变可逆性（即 在每个循环中完全恢复）超过 700 个加载循环。此外，除了低刚度之外，传感器还表现出超高的拉伸性（高达 300% 的伸长率），这意味着传感器对敏感人体运动监测应用（包括大变形和小变形）引起的机械效应最小。结果表明，本传感器在反映人体运动检测方面具有广阔的前景。