Chen Xiaojun, Lin Xitong, Mo Deyun, Xia Xiaoqun, Gong Manfeng, Lian Haishan, Luo Yihui
School of Mechanical and Electronic Engineering, Lingnan Normal University Zhanjiang 524048 China
Department of Mechanical & Electrical Engineering, Xiamen University 361102 China
RSC Adv. 2020 Jul 13;10(44):26188-26196. doi: 10.1039/d0ra04431h. eCollection 2020 Jul 9.
Bionic electronic skin with human sensory capabilities has attracted extensive research interest, which has been applied in the fields of medical health diagnosis, wearable electronics, human-computer interaction, and bionic prosthetics. Electronic skin tactile pressure sensing required high sensitivity, good resolution and fast response for sensing different pressure stimuli. In particular, there were still great challenges in the detection of wide pressure and the preparation of sensitive unit microstructures. Here, the direct-write printing of Weissenberg principle to fabricate GNPs/MWCNT filled conductive composite flexible pressure sensors on PDMS substrates was proposed. The effects of platform moving speed, microneedle rotation speed and the number of direct-write times on the line width of the pressure sensitive structure were investigated based on orthogonal experiments, and the optimal direct-write printing parameters were obtained. The performance of the S-shaped polyline pressure sensor was tested, in which the sensitivity could reached 0.164 kPa, and the response/recovery time was 100 ms and 100 ms respectively. The capture cases of objects of different quality and objects with flat/curved surfaces were successively demonstrated to exhibit its excellent sensitivity, stability and fast response performance. This work may paved the road for future integration of high-performance electronic skin in smart robotics and prosthetic solutions.
具有人类感官能力的仿生电子皮肤引起了广泛的研究兴趣，已应用于医疗健康诊断、可穿戴电子设备、人机交互和仿生假肢等领域。电子皮肤触觉压力传感需要高灵敏度、良好的分辨率和快速响应来感知不同的压力刺激。特别是，在宽压力检测和敏感单元微结构制备方面仍面临巨大挑战。在此，提出了基于魏森堡原理的直写印刷方法，在聚二甲基硅氧烷（PDMS）基板上制备石墨烯纳米片/多壁碳纳米管（GNPs/MWCNT）填充的导电复合柔性压力传感器。基于正交实验研究了平台移动速度、微针转速和直写次数对压敏结构线宽的影响，获得了最佳直写印刷参数。测试了S形折线压力传感器的性能，其灵敏度可达0.164 kPa，响应/恢复时间分别为100 ms和100 ms。相继展示了对不同质量物体以及具有平面/曲面物体的捕获情况，以展示其优异的灵敏度、稳定性和快速响应性能。这项工作可能为未来高性能电子皮肤在智能机器人和假肢解决方案中的集成铺平道路。
