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. 2021 Mar 12;11(3):718. doi: 10.3390/nano11030718

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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EIS response (Nyquist plots) of Au bare (blue curve), Au/SAMCys/OLNPs (black curve) and Au/KLNPs (red curve). The inset shows a magnification of blue and black curves and equivalent circuits used for fitting the experimental data, where (1) was used for Au bare and (2) for both modified electrodes. Experimental conditions: 5 mM Fe(CN)₆³⁻/Fe(CN)₆⁴⁻ in PBS buffer (pH = 7.4) at 10³ Hz.