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. 2019 Sep 10;9:13075. doi: 10.1038/s41598-019-48999-0

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Electrochemical impedance spectra of bare SPCE, f-MWCNTs and Mo NPs@f-MWCNTs modified electrode (A). CVs of bare SPCE, f-MWCNTs and Mo NPs@f-MWCNTs modified electrode in 5 mM [Fe(CN)₆]^3−/4− with 0.1 M KCl solution at 50 mV s⁻¹ (B). CVs of the Mo NPs@f-MWCNTs/SPCE in 5 mM [Fe(CN)₆]^3−/4− with 0.1 M KCl at scan rates of 20–300 mV s⁻¹ (C). The linear plot for redox (I_pa and I_pc) peak current vs. scan rate (D).