https://doi.org/10.1140/epjs/s11734-025-01711-y
Regular Article
Tensile strain sensor based on cracked LIG for health monitoring applications
School of Mechanical and Electrical Engineering, Beijing Institute of Graphic Communication, 100260, Beijing, People’s Republic of China
Received:
28
December
2024
Accepted:
26
May
2025
Published online:
8
June
2025
Flexible strain sensor is a type of intelligent wearable sensing devices. Flexible strain sensors hold broad application prospects and have thus attracted significant attention. Among them, tensile strain sensors based on laser-induced graphene (LIG) have been extensively studied due to their simplicity, flexibility, and patterning advantages. However, the sensitivity of LIG-based sensors is challenging to modulate, which has hampered their application and research. In this work, grooves are cut on the laser-induced graphene layer to create tensile strain sensors with controllable cracks via pre-stretched stress concentration. A model for sensor sensitivity under tensile action is also proposed. The fabricated sensors possess the following characteristics: the sensitivity is regulated according to the number of cracks (reaching the highest sensitivity when the number of cracks is 500), an expanded working sensing range with a high sensitivity of up to 373.81, a rapid response time (less than 100 ms), detection under bidirectional bending of 180°, and a minimum strain detection limit of 0.002%, excellent durability (withstanding 10,000 stretching-release cycles), and insensitivity to pressure. The sensors are assembled to detect various human motions, demonstrating their application value in smart devices, electronic skins, and wearable medical monitors.
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© The Author(s), under exclusive licence to EDP Sciences, Springer-Verlag GmbH Germany, part of Springer Nature 2025
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
