Orthogonal Pressure‐Humidity Bimodal Sensing via Hierarchical Micro‐Nano Engineering of Flexible Electronic Skins

ABSTRACT Integrating multimodal sensing within a single, compact footprint is pivotal for next‐generation intelligent systems, particularly embodied intelligent robots, precision medicine, and smart manufacturing, where spatially co‐located perception of multiple physical cues is essential. Conventional flexible sensors, however, suffer from severe cross‐talk when simultaneously detecting distinct stimuli at the same location, leading to signal ambiguity and degraded fidelity. Herein, we report a flexible pressure–humidity bimodal sensor achieved through a synergistic structure–material co‐design strategy that couples a micro‐nano hierarchical structure with multifunctional electrospun nanofibrous layers. The device delivers high‐fidelity, real‐time responses to pressure (sensitivity: 0.0955 kPa − 1 over 0–10 kPa) and humidity (0.1245 kΩ/%RH), exhibits robust cycling stability (>3000 cycles), and achieves small crosstalk (<4.27%). Preliminary experimental and simulation results demonstrate the sensor's future potential in two proof‐of‐concept demonstrations: non‐destructive assessment of blueberry maturity based on flesh firmness and skin moisture, and co‐located monitoring of interface pressure and skin wetness for proactive assessment of pressure ulcer risk in bedridden patients. This work establishes a “micro‐nano architecture/multifunctional material” co‐design paradigm, providing a scalable pathway enabling electronic skin to perceive diverse and complex environments with high integration and low interference.