Migratory Animals‐Enlightened Hydrogen‐Bonded Organic Framework Nanorods Electrodeposited Nickel‐Based Fabrics for Ultrafast and Ultrasensitive Dual‐Environmental Magnetic Field Luminescence Responsive Monitoring Both in Air and Water

Abstract Migratory animals with magnetic receptors can sense the Earth's magnetic field, a phenomenon known as magnetoreception, and use it for long‐distance navigation. Nevertheless, research on flexible luminescent magnetic sensors, particularly those suitable for both aerial and underwater environments, remains extremely underdeveloped. Herein, enlightened by the magnetic perception ability of migratory animals, an air and underwater dual‐environment bionic luminescent magnetic sensor (HOF‐14@Ni fabric) is initiatively fabricated by electroplating hydrogen‐bonded organic frameworks (HOF‐14) onto nickel‐based conductive fabric via a coordinated electrodeposition method. In both air and underwater environments, HOF‐14@Ni fabric exhibits ultrafast response speed (40 and 240 ms), ultralow detection limit (0.0227 and 0.0337 mT), ultrahigh sensitivity (1510.23 and 51.89 T −1 ), ultrahigh measurement accuracy (relative standard deviation ≤ 0.52% and 0.097%), and great repeatability (900 and 540 cycles), respectively. Finite element simulation analysis of displacement and magnetic flux density changes for HOF‐14@Ni fabric reveals that the magnetic response mechanism can be attributed to the magnetic‐caused bending behavior resulting from magnetic attraction. Additionally, underwater magnetic wireless communication, motion perception, and air‐underwater dual‐environment magnetic intelligent real‐time monitoring are further materialized. This work opens up a brand‐new path for the application of luminescent (fluorescent) sensors in the field of dual‐environment magnetic sensing.