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Gravity‐Driven Air‐Liquid Interface Flexible Sensor for Human Motion Detection
Author(s) -
Zhuang Zhenqian,
Ding Ke,
Zhong Hailing,
Shen Lan,
Zhang Zuowen
Publication year - 2025
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.202412022
Abstract This study introduces a novel gravity‐driven air‐liquid interface flexible sensor (GALIFS) for detecting human motions. GALIFS leverages gravity‐induced liquid flow to generate angle‐dependent electrical signals, eliminating the need for material deformation (e.g., stretching or compression) during operation. Unlike conventional inertial sensors (limited by rigid designs causing discomfort) or existing flexible sensors (reliant on stress‐induced signals and high material durability), GALIFS overcomes these constraints through its unique gravity‐driven mechanism. Furthermore, GALIFS operates without requiring perfect skin adhesion, significantly enhancing user comfort. GALIFS achieves a wide angular detection range (0°–180°) with high stability (over 16000 cycles). Additionally, it can identify a diverse range of human motions, including neck bending, spine bending, squatting, jumping, walking, and running. A real‐time lying posture monitoring system for bedridden patients is further developed, showcasing its medical potential. Following successful mitigation of liquid evaporation issues, GALIFS may have significant potential for applications in various scenarios, including medical rehabilitation and sports training.

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