Highly flexible strain sensors based on CNT-reinforced Ecoflex silicone rubber for wireless facemask breathing monitoring via Bluetooth
Authors
Bosque, Antonio del; Fernández Sánchez-Romate, Xoan Xosé; Llana Calvo, Álvaro de la; Fernández Barbosa, Pedro Rafael; Borromeo, Susana; [et al.]Identifiers
Permanent link (URI): http://hdl.handle.net/10017/60951DOI: 10.1021/acsapm.3c01689
ISSN: 2637-6105
Publisher
ACS
Date
2023-09-05Funders
Agencia Estatal de Investigación
Comunidad de Madrid
Bibliographic citation
Bosque, A. del [et al.], 2023, "Highly flexible strain sensors based on CNT-reinforced Ecoflex silicone rubber for wireless facemask breathing monitoring via Bluetooth", ACS Applied Polymer Materials, vol. 5, no. 10, pp. 8589-8599.
Keywords
Carbon nanotubes
Breathing monitoring
Ecoflex
Bluetooth Low Energy
Nanocomposites
Project
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2019-107874RB-I00/ES/MATERIALES COMPUESTOS MULTIFUNCIONALES CON CAPACIDAD DE ALMACENAMIENTO DE ENERGIA Y MONITORIZACION DE SALUD ESTRUCTURAL PARA VEHICULOS ELECTRICOS/
info:eu-repo/grantAgreement/CAM//S2018%2FNMT-4411/ES//ADITIMAT-CM
Document type
info:eu-repo/semantics/article
Version
info:eu-repo/semantics/publishedVersion
Publisher's version
https://doi.org/10.1021/acsapm.3c01689Rights
Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
© 2023 The authors
Access rights
info:eu-repo/semantics/openAccess
Abstract
Highly stretchable strain sensors based on carbon nanotube (CNT)-reinforced Ecoflex silicone rubber are developed for breathing monitoring purposes. The addition of CNTs promotes an improvement in electrical conductivity and mechanical properties (Young’s modulus and tensile strength) due to its good dispersion in Ecoflex. The evaluation of strain monitoring response, in both tensile and compression conditions, indicates a wide strain detection range and an ultrasensitive response at high strain levels, reaching a gauge factor of around 104 at 70% or 105 at 300% for 0.3 and 0.7 wt % CNT-reinforced sensors, respectively. They show a quite stable electrical response under 2000 cycling loads and different levels of frequencies. Moreover, the response and recovery times are in the range of milliseconds (∼600 and ∼800 ms, respectively). Finally, a proof-of-concept of wireless facemask breathing monitoring was carried out with Bluetooth Low Energy technology and a platform that has been developed to acquire, filter, visualize, and store the breathing signal. With this, the respiration rate can be unequivocally monitored as well as the difference between inspiration and expiration. Thus, this type of trial is proposed for breath monitoring in medical analysis, emergency teams, or first aid.
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