Simultaneously Achieving Ultrahigh Sensitivity and Wide Detection Range for Stretchable Strain Sensors with an Interface‐Locking Strategy,Advanced Materials Technologies

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Simultaneously Achieving Ultrahigh Sensitivity and Wide Detection Range for Stretchable Strain Sensors with an Interface‐Locking Strategy
Advanced Materials Technologies ( IF 6.4 ) Pub Date : 2020-04-02 , DOI: 10.1002/admt.202000008
Waner Lin ₁ , Chubin He ₁ , Huayi Huang ₁ , Wenyu Zhao ₂ , Yanbing Qiu ₁ , Xiao Guan ₁ , Qi Zhang ₁ , Ziya Wang ₂ , Zhengchun Peng ₁

Affiliation

The development of stretchable strain sensors is crucial for the implementation of electronic skins and wearable electronics. Resistive‐type strain sensors are typically composed of an electrically conductive sensing layer coupled to a stretchable substrate. When a sensor is stretched, microstructural changes in the sensing layer lead to a strain‐dependent change in resistance. However, strain sensors with high sensitivity and specificity often suffer from a limited detection range along with reliability issues. Here, a novel strain sensor composed of Ag particles and long‐range entangled carbon nanotubes (CNTs) with a special composite design is proposed, in which a strain‐induced self‐locking effect is introduced at the interface between the CNT film and a percolating network consisting of Ag particle filler. As a result, the sensors achieve significantly enhanced performance such as large stretchability (≥120%), high gauge factor (3990.8), fast response time (<33 ms), and high mechanical durability. A range of wearable applications including radial artery, facial expression, and joint motion monitoring are demonstrated, which range from minute deformation to excessive stretching of the sensor.

中文翻译：

通过接口锁定策略同时实现可拉伸应变传感器的超高灵敏度和宽检测范围

可拉伸应变传感器的发展对于实现电子皮肤和可穿戴电子设备至关重要。电阻型应变传感器通常由与可拉伸基板耦合的导电传感层组成。拉伸传感器时，传感层的微结构变化会导致电阻的应变相关变化。然而，具有高灵敏度和专一性的应变传感器经常遭受有限的检测范围以及可靠性问题。在此，提出了一种由银粒子和长距离缠结的碳纳米管（CNT）组成的新型应变传感器，并具有特殊的复合设计，其中在CNT膜与渗流之间的界面处引入了应变诱导的自锁效应。网络由银颗粒填料组成。结果是，传感器实现了显着增强的性能，例如较大的拉伸性（≥120％），高规格系数（3990.8），快速的响应时间（<33 ms）和较高的机械耐久性。演示了一系列可穿戴应用程序，包括radial动脉，面部表情和关节运动监控，范围从微小的变形到传感器的过度拉伸。

更新日期：2020-04-02

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