Bosque, Antonio delSánchez-Romate, Xoan F.Sánchez, MaríaUreña, Alejandro2023-09-202023-09-202022Antonio del Bosque, Xoan F. Sánchez-Romate, María Sánchez, Alejandro Ureña, Ultrasensitive and highly stretchable sensors for human motion monitoring made of graphene reinforced polydimethylsiloxane: Electromechanical and complex impedance sensing performance, Carbon, Volume 192, 2022, Pages 234-248, ISSN 0008-6223, https://doi.org/10.1016/j.carbon.2022.02.0430008-6223https://hdl.handle.net/10115/24410This work was supported by the Agencia Estatal de Investigación of Spanish Government [Project MULTIFUNC-EVs PID2019-107874RB-I00] and Comunidad de Madrid Government [Project ADITIMAT-CM (S2018/NMT-4411)].Highly stretchable sensors based on graphene nanoplatelet (GNP) reinforced polydimethylsiloxane (PDMS) are manufactured for human motion monitoring purposes. The strain sensing analysis shows ultra-high gauge factor (GF) values from 40 to 300 at low strain levels up to 106 at high deformations at tensile conditions, and a decreasing sensitivity as GNP content increases. The compressive behavior shows an initial decrease of the electrical resistance, due to the prevalence of in-plane mechanisms, followed by a stable increase, due to the prevalence of out-of-plane mechanisms. In this regard, the Electrical Impedance Spectroscopy (EIS) analysis shows an increase of the complex impedance with increasing compressive strain. The equivalent RC-LRC circuit allows to explain the electrical mechanisms governing the compressive behavior, where the LRC element denotes the contact and intrinsic resistance and the RC element the tunnelling effect. Finally, a proof of concept of human motion monitoring proves the capability of the scalable and easy-manufactured sensors to detect frowning, raising eyebrows, blinking, breathing, blowing and, even, vocal cord motion, where each phoneme follows a unique pattern, with a robust electrical response.engAttribution-NonCommercial-NoDerivatives 4.0 Internacionalhttp://creativecommons.org/licenses/by-nc-nd/4.0/Graphene nanoplateletsWearable sensorsEISHuman motion monitoringSHMinfo:eu-repo/semantics/article10.1016/j.carbon.2022.02.043info:eu-repo/semantics/openAccess