https://doi.org/10.1140/epjs/s11734-025-01557-4
Regular Article
Bi-sided laser-induced graphene sensor with decoupled bending and stretching sensing
Institute of Advanced Structure Technology, Beijing Institute of Technology, 100081, Beijing, China
Received:
2
January
2025
Accepted:
27
February
2025
Published online:
18
March
2025
As joint bending deformation is a primary feature of biological motions, measuring the joint angle variations of human is crucial, especially due to its significant spatial coordinate transformation and highly variable effective strain distribution across the section. The coupled deformation mode and the remarkable strain make the precious monitor of the joint motion challenging. In this study, we designed a monolithic flexible sensor with bi-side laser-induced graphene (BS-LIG) with a decoupling capability for tension and bending deformation modes. The sensor featured a PDMS substrate with sensing units on both surfaces can eliminate the contribution of tensile strain of the neural plane on the sensing value by utilizing the difference of the two-strain data, offering a reliable data in feedbacking the value of the real-time joint angle. Benefiting from the inherent softness and stretchability of PDMS, the BS-LIG sensor can withstand a tension of over 45% and a bending deformation up to 180°. Its electrical signal changes show excellent linearity with both strain and angle. Moreover, the sensor can accurately detect signal changes under varying loading rates and demonstrates high durability. Demonstrations include monitoring the bending deformation of human fingers and wrists validated the flexible sensor’s outstanding performance and significant potential for application in wearable electronic devices.
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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.
