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. 2019 Dec 3;9(4):139. doi: 10.3390/bios9040139

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© 2019 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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Cyclic voltammograms of bare screen printed electrodes (SPEs) and biochar/SPEs sensors obtained with dispersion of (a) DMF:H₂O (1:1 v/v), (b) DMF, (c) NMP, or (d) ethanol. Measurement conditions: scan rate 30 mVs⁻¹.