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A.V. is in receipt of an FPU grant from the Spanish Government (FPU18/03235), funded by MCIN/AEI/10.13039/501100011033 "ESF Investing in your future". A.V., Y.K.R., and J.M. acknowledge the funding under project REGRAP-2D (PID2020-114234RBC22), which was funded by MCIN/AEI/10.13039/501100011033. Funding was also obtained from the Comunidad de Madrid through project NMAT2D-CM (P2018/NMT-4511) and MINCIN y Comunidad de Madrid, "Materiales Disruptivos Bidimensionales (2D)'' (MAD2D-CM)-UPM1. Additional support from the Spanish "Agencia Estatal de Investigacion '' under the call "Proyectos de Generacion de Conocimiento 2022 '' (3DPOSTHERMEC, PID2022-137274NB-C33PID) is also acknowledged. The authors also would like to acknowledge ICTS Micronanofabs.

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Laser-Induced Graphene Strain Sensors for Body Movement Monitoring

Publicat a:Acs Omega. 9 (37): 38359-38370 - 2024-08-30 9(37), DOI: 10.1021/acsomega.3c09067

Autors: Barja, AM; Ryu, YK; Tarancón, S; Tejado, E; Hamada, A; Velasco, A; Martinez, J

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To enable the development of artificial intelligence of things, the improvement of the strain sensing mechanisms and optimization of the interconnections are needed. Direct laser writing to obtain laser-induced graphene (LIG) is being studied as a promising technique for producing wearable, lightweight, highly sensitive, and reliable strain sensors. These devices show a higher degree of flexibility and stretchability when transferred to an elastomeric substrate. In this article, we manufactured polydimethylsiloxane (PDMS)-encapsulated LIG piezoresistive strain sensors with a quasi-linear behavior and a gauge factor of 111. The produced LIG was morphologically characterized via Raman spectroscopy and scanning electron microscopy before and after the electromechanical characterization and before and after the LIG transfer to PDMS. The results from these analyses revealed that the integrity of the material after the test was not affected and that the LIG volume in contact with the substrate increased after transfer and encapsulation in PDMS, leading to the improvement of the sensor performance. The sensors' capability for measuring bend angles accurately was demonstrated experimentally, making them useable in a wide range of applications for human body movement monitoring as well as for structural health monitoring. Regarding body monitoring, a PDMS-encapsulated LIG sensor for knee bending angle detection was proposed. This device showed unaffected performance of 1500 cycles under 8% uniaxial deformation and with response times in the range of 1-2 s

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