School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, China.
The Faculty of Printing, Packaging Engineering and Digital Media Technology, Xi'an University of Technology, Xi'an 710048, China.
ACS Appl Mater Interfaces. 2021 Sep 22;13(37):44925-44934. doi: 10.1021/acsami.1c13079. Epub 2021 Sep 8.
Flexible strain sensors with high performance are actively and widely investigated for wearable electronic devices. However, the conventional sensors often suffer from a lack of detection of complex multidimensional strain, which severely limits their wide applications. To overcome this critical challenge, we propose a pattern design by screen printing to construct an asymmetrical cross-conductive network in the piezoresistive strain sensor, which can enhance the response to external stimuli in different directions. The unique network endows the prepared sensors with the excellent ability of instantaneous detection and accurate identification of multidimensional strains. Moreover, the sensor also demonstrates high sensitivity, fast response, an ultra-wide sensing range, and excellent stability and durability. Benefiting from the outstanding comprehensive performance of the prepared sensor, a full range of human actions (wink, smile, swallowing, and joint bending) and subtle bio-signals (pulse and breathing) are easily and accurately monitored. A wireless wearable device assembled by the sensor shows great potential applications in practical real-time physiological monitoring and intelligent mobile diagnosis for humans. This work provides an innovative and effective strategy for manufacturing flexible and multifunctional strain sensors to fully satisfy versatile applications of new-generation wearable electronic devices.
具有高性能的柔性应变传感器正被积极广泛地研究用于可穿戴电子设备。然而，传统的传感器通常缺乏对复杂多维应变的检测，这严重限制了它们的广泛应用。为了克服这一关键挑战，我们提出了一种通过丝网印刷进行图案设计的方法，在压阻应变传感器中构建非对称的交叉导电网络，从而增强对不同方向外部刺激的响应。这种独特的网络赋予了制备的传感器对多维应变进行瞬时检测和精确识别的优异能力。此外，该传感器还表现出高灵敏度、快速响应、超宽的传感范围以及出色的稳定性和耐用性。得益于制备的传感器出色的综合性能，它可以轻松、准确地监测各种人体动作（眨眼、微笑、吞咽和关节弯曲）和微妙的生物信号（脉搏和呼吸）。由传感器组装的无线可穿戴设备在人体实时生理监测和智能移动诊断的实际应用中显示出巨大的潜力。这项工作为制造灵活多功能应变传感器提供了一种创新而有效的策略，以充分满足新一代可穿戴电子设备的各种应用。
