Wang Tao, Li Jinhui, Zhang Yu, Liu Feng, Zhang Bo, Wang Ying, Jiang Run, Zhang Guoping, Sun Rong, Wong Ching-Ping
The Shenzhen International Innovation Institutes of Advanced, Electronic Materials, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055, P.R. China.
Key Laboratory of Precision Electronic Manufacturing Equipment, and Technology, Guangdong University of Technology, Ministry of Education, Guangzhou, 510006, P.R. China.
Chemistry. 2019 May 2;25(25):6378-6384. doi: 10.1002/chem.201900014. Epub 2019 Apr 5.
Wearable sensors with excellent flexibility and sensitivity have emerged as a promising field for healthcare, electronic skin, and so forth. Three-dimensional (3D) graphene sponges (GS) have emerged as high-performance piezoresistive sensors; however, problems, such as limited flexibility, high cost, and low sensitivity, remain. Meanwhile, device-level wearable pressure sensors with GS have rarely been demonstrated. In this work, highly ordered 3D porous graphene sponges (OPGSs) were first successfully prepared and controlled through an emulsion method, and then a device-level wearable pressure sensor with high flexibility and sensitivity was assembled with a gold electrode and polydimethylsiloxane into a reliable package. The pH values were carefully controlled to form a stable emulsion and the OPGSs showed a highly ordered 3D structure with ultralow density, high porosity, and conductivity; this resulted in a gauge factor of 0.79-1.46, with 50 % compression strain and excellent long-term reproducibility over 500 cycles of compression-relaxation. Moreover, the well-packaged pressure sensor devices exhibited ultrahigh sensitivity to detect human motions, such as wrist bending, elbow bending, finger bending, and palm flexing. Thus, the developed pressure sensors exhibited great potential in the fields of human-interactive applications, biomechanical systems, electronic skin, and so forth.
具有出色柔韧性和灵敏度的可穿戴传感器已成为医疗保健、电子皮肤等领域的一个有前景的方向。三维（3D）石墨烯海绵（GS）已成为高性能压阻式传感器；然而，仍存在诸如柔韧性有限、成本高和灵敏度低等问题。同时，很少有关于具有GS的器件级可穿戴压力传感器的报道。在这项工作中，首先通过乳液法成功制备并控制了高度有序的三维多孔石墨烯海绵（OPGS），然后将具有高柔韧性和灵敏度的器件级可穿戴压力传感器与金电极和聚二甲基硅氧烷组装成一个可靠的封装。仔细控制pH值以形成稳定的乳液，OPGS呈现出具有超低密度、高孔隙率和导电性的高度有序三维结构；这导致其在50%压缩应变下的应变计因子为0.79 - 1.46，并且在500次压缩 - 松弛循环中具有出色的长期重现性。此外，封装良好的压力传感器器件对检测人体运动，如手腕弯曲、肘部弯曲、手指弯曲和手掌弯曲，表现出超高灵敏度。因此，所开发 的压力传感器在人机交互应用、生物力学系统、电子皮肤等领域展现出巨大潜力。
