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. 2019 Dec 2;9:18121. doi: 10.1038/s41598-019-54746-2

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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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The response time of porous NiMn₂O₄ NSs@NF sensor electrode (a) A response time of 3 s at a gluconic concentration of 5.964 μM. (b) A response time of 2 s at a gluconic concentration of 0.115 mM. (c) Amperometric response of porous NiMn₂O₄ NSs@NF sensor electrode at 0.45 V upon additions of 1.0 mM glucose, 0.1 mM CA, 0.1 mM Urea, 0.1 mM AA, 0.1 mM NaCl and 0.1 mM Glu in 0.5 M NaOH electrolyte. (d) Comparing CV curves of porous NiMn₂O₄ NSs@NF sensor electrode after 1 day and 30 days at a sweep rate of 20 mV s⁻¹ in 0.5 M NaOH with 1 mM glucose.