Abstract Lightweight, flexible and highly sensitive piezoresistive sensors are promising for future generations of wearable electronics, artificial intelligence, human-computer interaction and soft robotics. Herein, segregated microcellular nanocomposites based on the microcellular poly(ether-block-amide) beads coated with silver (microcellular Pebax@Ag beads) are fabricated by the scalable and feasible supercritical CO2 foaming combined with dip-coating and curing approach. The segregated microcellular nanocomposites show low mass density (0.6 g/cm3), good flexibility (60% compressibility) and high electrical conductivity (0.64 S/m) with ultralow percolation threshold (0.28 vol%) benefiting from the simultaneous incorporation of segregated structures and microcellular structures. The resultant segregated microcellular nanocomposite piezoresistive sensors exhibit superior piezoresistive performances including improved relative resistance changes and higher sensitivity upon the externally applied compression strains owing to the synergistic effect of multiple mechanisms: higher local effective MWCNT contents due to the excluded-volume effect, construction of more effective 3D MWCNT/Ag conductive networks and rapid response due to the highly-resilient microcellular Pebax beads. Furthermore, the segregated microcellular nanocomposite piezoresistive sensors show outstanding long-term durability and working stability upon the repeated compression strains. Practical applications of the segregated microcellular nanocomposite piezoresistive sensors in functional sole materials have been verified for human motion detection during walking, implying their outstanding potential for burgeoning applications such as wearable electronics, artificial intelligence, human-computer interaction and soft robotics.

中文翻译：

---

用于人体运动检测的轻量、灵活和高灵敏度隔离微孔纳米复合压阻传感器

摘要 轻巧、灵活和高灵敏度的压阻传感器有望用于下一代可穿戴电子产品、人工智能、人机交互和软机器人。在此，基于涂有银的微孔聚（醚-嵌段-酰胺）珠（微孔 Pebax@Ag 珠）的分离微孔纳米复合材料是通过可扩展且可行的超临界 CO2 发泡结合浸涂和固化方法制造的。分离的微孔纳米复合材料显示出低质量密度 (0.6 g/cm3)、良好的柔韧性 (60% 可压缩性) 和高导电性 (0.64 S/m) 以及超低渗透阈值 (0.28 vol%)，这得益于分离结构和微孔结构。由于多种机制的协同作用，所得分离的微孔纳米复合压阻传感器表现出优异的压阻性能，包括改善的相对电阻变化和对外部施加的压缩应变的更高灵敏度：由于排除体积效应，局部有效 MWCNT 含量更高，构建更多高效的 3D MWCNT/Ag 导电网络和高弹性微孔 Pebax 珠带来的快速响应。此外，隔离的微孔纳米复合压阻传感器在重复压缩应变下表现出出色的长期耐用性和工作稳定性。