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Injectable PEDOT:PSS/cholinium ionic liquid mixed conducting materials for electrocardiogram recordings
journal contribution
posted on 2023-02-16, 00:47 authored by N Casado, S Zendegi, LC Tomé, S Velasco-Bosom, A Aguzin, M Picchio, M Criado-Gonzalez, GG Malliaras, Maria ForsythMaria Forsyth, D MecerreyesMixed conducting polymer electrodes built from poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) are attracting a great deal of interest in healthcare monitoring. However, the widespread application of this organic conductor in wearable devices is seriously restricted by toxic additives used to enhance its electrical conductivity. Herein, we explored a family of biocompatible ionic liquids (ILs), based on the cholinium cation and different carboxylated anions, as dopants and gelators for PEDOT:PSS to formulate safe bioelectrodes for long-term cutaneous recording. We examined the effect of the IL anion on the ionic-electronic conductivities and physicochemical properties of these soft conductors. Among the different ILs tested, cholinium lactate ([Ch][Lac]) afforded the greatest increase in the materials’ electronic conductivity (≈30 S cm−1vs. 0.2 S cm−1 for non-formulated PEDOT:PSS). Moreover, the PEDOT:PSS/IL mixtures formed gels due to supramolecular intereactions. The gels showed a rheological behavior associated to gels with excellent injectability properties. Finally, the performance of PEDOT:PSS/[Ch][Lac] as biocompatible electrodes for electrocardiogram recording is discussed. All in all, the obtained results unveil the effectiveness of cholinum-based ILs as non-toxic dopants of PEDOT:PSS, paving the way to explore novel bioderived electrolytes.
History
Journal
Journal of Materials Chemistry CVolume
10Pagination
15186-15193Publisher DOI
ISSN
2050-7526eISSN
2050-7534Language
EnglishPublication classification
C1 Refereed article in a scholarly journalIssue
40Publisher
ROYAL SOC CHEMISTRYUsage metrics
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Keywords
Science & TechnologyTechnologyPhysical SciencesMaterials Science, MultidisciplinaryPhysics, AppliedMaterials SciencePhysicsELECTRICAL-CONDUCTIVITYPEDOTPSSELECTRODESDYNAMICSFILMSMaterials Engineering not elsewhere classifiedMacromolecular and Materials Chemistry not elsewhere classifiedPhysical Chemistry not elsewhere classified
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