Bioinspired Hierarchical Structure for an Ultrawide?Range Multifunctional Flexible Sensor Using Porous Expandable Polyethylene/Loofah?Like Polyurethane Sponge Material

Capacitive sensors show promising applications for human–computer interface due to their potential capabilities of both pressure and proximity sensing. However, the sensitivity loss at large strain complicated process fabrication technology limit related applications. Herein, inspired by gradient hierarchical structures in biological systems using porous materials with different stiffness, a capacitive flexible sensor sensing abilities is proposed. Such effectively reduce attenuation as increases, realizing an ultrawide detection range high sensitivity. A theoretical mathematical model developed corresponding fabricated high-performance impregnated dust-free paper electrode expandable polyethylene (EPE)/loofah-like polyurethane sponge (LPS) double-layer dielectric. This has up 3000 kPa significantly low 0.0195% kPa?1 noncontact mode reaches 28 cm (0.122 cm?1). Notably, strategy provided design over from approaching pressuring, eventually its application presented interaction.