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. 2022 Sep 15;13:5423. doi: 10.1038/s41467-022-33094-2

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© The Author(s) 2022

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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — a Equivalent circuit of an OECT during impedance sensing. Orange and blue colors indicate ionic and electronic parts of the circuit, respectively. b Modeling of the current frequency spectra of an OECT and a PEDOT:PSS microelectrode. c Normalized OECT source current amplitudes as a function of the applied frequency for different channel geometries. d OECT sensitivity during the microparticle impedance sensing experiment. The error bars are obtained by averaging between the approach and lift curves of the AFM experiment. e Comparison between the sensitivity of an OECT and a microelectrode having the same dimensions. f OECT gain for different channel geometries.