Jeong Sung-Yeob, Lee Jun-Uk, Hong Sung-Moo, Lee Chan-Woo, Hwang Sung-Hwan, Cho Su-Chan, Shin Bo-Sung
Department of Mechanical Engineering, The University of Tokyo, Tokyo 113-8656, Japan.
Department of Cogno-Mechatronics Engineering, Pusan National University, Pusan 46241, Korea.
Nanomaterials (Basel). 2021 Apr 8;11(4):951. doi: 10.3390/nano11040951.
Bio-compatible strain sensors based on elastomeric conductive polymer composites play pivotal roles in human monitoring devices. However, fabricating highly sensitive and skin-like (flexible and stretchable) strain sensors with broad working range is still an enormous challenge. Herein, we report on a novel fabrication technology for building elastomeric conductive skin-like composite by mixing polymer solutions. Our e-skin substrates were fabricated according to the weight of polydimethylsiloxane (PDMS) and photosensitive polyimide (PSPI) solutions, which could control substrate color. An e-skin and 3-D flexible strain sensor was developed with the formation of laser induced graphene (LIG) on the skin-like substrates. For a one-step process, Laser direct writing (LDW) was employed to construct superior durable LIG/PDMS/PSPI composites with a closed-pore porous structure. Graphene sheets of LIG coated on the closed-porous structure constitute a deformable conductive path. The LIG integrated with the closed-porous structure intensifies the deformation of the conductive network when tensile strain is applied, which enhances the sensitivity. Our sensor can efficiently monitor not only energetic human motions but also subtle oscillation and physiological signals for intelligent sound sensing. The skin-like strain sensor showed a perfect combination of ultrawide sensing range (120% strain), large sensitivity (gauge factor of ~380), short response time (90 ms) and recovery time (140 ms), as well as superior stability. Our sensor has great potential for innovative applications in wearable health-monitoring devices, robot tactile systems, and human-machine interface systems.
基于弹性体导电聚合物复合材料的生物相容性应变传感器在人体监测设备中发挥着关键作用。然而，制造具有宽工作范围的高灵敏度且类似皮肤（柔性和可拉伸）的应变传感器仍然是一个巨大的挑战。在此，我们报告了一种通过混合聚合物溶液来构建弹性体导电类皮肤复合材料的新型制造技术。我们的电子皮肤基板是根据聚二甲基硅氧烷（PDMS）和光敏聚酰亚胺（PSPI）溶液的重量制造的，这可以控制基板颜色。通过在类皮肤基板上形成激光诱导石墨烯（LIG），开发了一种电子皮肤和三维柔性应变传感器。对于一步法，采用激光直写（LDW）来构建具有闭孔多孔结构的优异耐用的LIG/PDMS/PSPI复合材料。涂覆在闭孔结构上的LIG石墨烯片构成了可变形的导电路径。当施加拉伸应变时，与闭孔结构集成的LIG会加剧导电网络的变形，从而提高灵敏度。我们的传感器不仅可以有效地监测人体的剧烈运动，还可以监测细微的振动和生理信号以实现智能声音传感。这种类皮肤应变传感器展现了超宽传感范围（120%应变）、高灵敏度（应变片系数约为380）、短响应时间（90毫秒）和恢复时间（140毫秒）以及卓越稳定性的完美结合。我们的传感器在可穿戴健康监测设备、机器人触觉系统和人机接口系统的创新应用方面具有巨大潜力。
