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. 2020 Oct 14;10:17180. doi: 10.1038/s41598-020-74337-w

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Current vs time plots recorded in 10 mL of Universal buffer: (a) COT Cl⁻ sensor response in the chloride relevant concentration range of human sweat between 10 and 100 mM. The Cl⁻ concentration has been increased adding 2 M of KCl in the whole solution. The applied potential is 0.1 V. (b) COT pH sensor response in the pH relevant range for human sweat between 5 and 7 pH level. The pH has been increased adding 1 M of KOH. The applied potential is − 0.2 V. Linear response of the normalized current variation versus the (c) logarithm of chloride ion concentration and (d) pH value, for the four yarns. Each thread was characterized separately. The error bars are omitted as the relative error is less than 1%. (e) Summary of threads sensitivities for all the different analysed fibers.