Department of Chemistry and Center for Nano and Micro Mechanics (CNMM), Tsinghua University , Beijing 100084, People's Republic of China.
ACS Appl Mater Interfaces. 2016 Aug 17;8(32):20894-9. doi: 10.1021/acsami.6b06984. Epub 2016 Aug 5.
Recent years have witnessed the explosive development of flexible strain sensors. Nanomaterials have been widely utilized to fabricate flexible strain sensors, because of their high flexibility and electrical conductivity. However, the fabrication processes for nanomaterials and the subsequent strain sensors are generally complicated and are manufactured at high cost. In this work, we developed a facile dry-Meyer-rod-coating process to fabricate sheath-core-structured single-fiber strain sensors using ultrafine graphite flakes as the sheath and silk fibers as the core by virtue of their flexibility, high production, and low cost. The fabricated strain sensor exhibits a high sensitivity with a gauge factor of 14.5 within wide workable strain range up to 15%, and outstanding stability (up to 3000 cycles). The single-fiber-based strain sensors could be attached to a human body to detect joint motions or easily integrated into the multidirectional strain sensor for monitoring multiaxial strain, showing great potential applications as wearable strain sensors.
近年来，柔性应变传感器得到了迅猛发展。由于纳米材料具有高柔韧性和导电性，因此被广泛用于制造柔性应变传感器。然而，纳米材料的制造工艺以及后续应变传感器的制造工艺通常较为复杂，成本较高。在这项工作中，我们开发了一种简便的干法 Meyer 棒涂工艺，利用超细石墨片作为鞘层，丝纤维作为芯层，制备出具有鞘芯结构的单纤维应变传感器。这种单纤维应变传感器具有很高的灵敏度，在 15%的宽工作应变范围内其应变系数高达 14.5，并且具有出色的稳定性（可达 3000 个循环）。基于单纤维的应变传感器可以附着在人体上以检测关节运动，也可以很容易地集成到多维应变传感器中以监测多轴应变，作为可穿戴应变传感器具有很大的应用潜力。
