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. 2019 Jan 18;9(1):115. doi: 10.3390/nano9010115

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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 10.0 µM rutin on the different electrodes in 0.2 M H₂SO₄: GCE (a), GO/GCE (b), NH₂-Fe₃O₄ NPs-GO/GCE (c), ErGO/GCE (d), and NH₂-Fe₃O₄ NPs-ErGO/GCE (e). The scan rate of 0.1 V/s.