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. 2017 Oct 3;17(10):2267. doi: 10.3390/s17102267

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© 2017 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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(A) Cyclic voltammograms performed in 2 mM ferricyanide/ferrocyanide (Fe(CN)₆³⁻/Fe(CN)₆⁴⁻), prepared in 100 mM potassium chloride, at a scan rate of 0.05 V/s, for (green line) paper towel, (red line) waxed paper, and (black line) Parafilm M^®. Inset: cyclic voltammograms performed in 100 mM potassium chloride, at a scan rate of 0.05 V/s, for (green line) paper towel, (red line) waxed paper, and (black line) Parafilm M^®; (B) Complex plane impedance plots at open circuit potential, using a 2 mM ferricyanide/ferrocyanide in 0.1 M KCl for (green line) paper towel, (red line) waxed paper, and (black line) Parafilm M^®. Inset: Randles circuit.