Chen Huamin, Lv Longfeng, Zhang Jiushuang, Zhang Shaochun, Xu Pengjun, Li Chuanchuan, Zhang Zhicheng, Li Yuliang, Xu Yun, Wang Jun
Fujian Provincial Key Laboratory of Functional Marine Sensing Materials, Center for Advanced Marine Materials and Smart Sensors, Minjiang University, Fuzhou 350108, China.
Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China.
Nanomaterials (Basel). 2020 Jan 27;10(2):218. doi: 10.3390/nano10020218.
Stretchable and wearable opto-electronics have attracted worldwide attention due to their broad prospects in health monitoring and epidermal applications. Resistive strain sensors, as one of the most typical and important device, have been the subject of great improvements in sensitivity and stretchability. Nevertheless, it is hard to take both sensitivity and stretchability into consideration for practical applications. Herein, we demonstrated a simple strategy to construct a highly sensitive and stretchable graphene-based strain sensor. According to the strain distribution in the simulation result, highly sensitive planar graphene and highly stretchable crumpled graphene (CG) were rationally connected to effectively modulate the sensitivity and stretchability of the device. For the stretching mode, the device showed a gauge factor (GF) of 20.1 with 105% tensile strain. The sensitivity of the device was relatively high in this large working range, and the device could endure a maximum tensile strain of 135% with a GF of 337.8. In addition, in the bending mode, the device could work in outward and inward modes. This work introduced a novel and simple method with which to effectively monitor sensitivity and stretchability at the same time. More importantly, the method could be applied to other material categories to further improve the performance.
可拉伸且可穿戴的光电器件因其在健康监测和表皮应用方面的广阔前景而受到全球关注。电阻式应变传感器作为最典型且重要的器件之一，在灵敏度和可拉伸性方面取得了巨大进展。然而，在实际应用中很难同时兼顾灵敏度和可拉伸性。在此，我们展示了一种构建高灵敏度和可拉伸性的基于石墨烯的应变传感器的简单策略。根据模拟结果中的应变分布，将高灵敏度的平面石墨烯和高可拉伸性的褶皱石墨烯（CG）合理连接，以有效调节器件的灵敏度和可拉伸性。对于拉伸模式，该器件在105%的拉伸应变下表现出20.1的应变系数（GF）。在这个大工作范围内，器件的灵敏度相对较高，并且该器件在应变系数为337.8时能够承受135%的最大拉伸应变。此外，在弯曲模式下，该器件可以向外和向内模式工作。这项工作引入了一种新颖且简单的方法，能够同时有效监测灵敏度和可拉伸性。更重要的是，该方法可应用于其他材料类别以进一步提升性能。
