Leaf-Inspired Asymmetrically Hierarchical Architecture Engineered Full-Paper Integrated Tactile Array for Ultra-Stable Sensory Augmentation

Abstract Facing the interwoven tendency of transformative advance and eco-friendly concept in wearable electronics, the development of sustainable epidermal sensor is still plagued by successfully introducing natural materials coupling with the improvement of fatigue threshold in high-frequency sensing scenarios. Here we propose a biomimetic concept that engineers a biodegradable and biocompatible full-paper integrated tactile array (FPTA) with leaf-inspired asymmetrically hierarchical architecture (LAHA) to alleviate the notorious structural vulnerability. Compared with conventional bulky configuration, the LAHA leverages compact laminated adjacent layer that dramatically facilitates in-plane stress distribution and diminishes the interfacial stress concentration for affording stable sensory augmentation, as unveiled by finite element simulation. The assembled multichannel and wireless FPTA monitoring system offers impeccable real-time spatiotemporal haptic pattern on multi-user interfaces with a record-high durability (150, 000 cycles), together with unprecedented merits integration including remarkably channel uniformity (97.2%), low interfacial contact impedance (1.78 ± 0.4 ohm, 1 kHz), and unparalleled sensitivity (12944 kPa−1), which serves as an eco-and user-friendly surveillance platform to analyze individual behavior in daily, thus suggesting a trustworthy architecture engineering strategy for tactile electronics in continuous health surveillance.