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. 2013 Nov 26;13(12):16129–16145. doi: 10.3390/s131216129

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© 2013 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 license (http://creativecommons.org/licenses/by/3.0/).

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Figure 8. — Nyquist diagrams of impedance spectra obtained prior to (1) and after addition of 1.0 (2), 10 (3) and 100 (4) nM OTA and the dependence of the charge transfer resistance on the logarithm of the OTA concentration (inset). Measurements in the presence of 0.01 M K₃ [Fe(CN)₆] and 0.01 M K₄ [Fe(CN)₆] at 0.235 V vs. Ag/AgCl. Frequency range 0.04 Hz–100 kHz, ac voltage amplitude: 5 mV.