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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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(a) The amperometric responses of porous NiMn₂O₄ NSs@NF sensor electrode with the successive additions of various concentration of glucose at a potential of 0.45 V (the concentration range of glucose in electrolyte bath is 0.99–67.30 μM). (b) The corresponding fitting curves, the concentration range of glucose in electrolyte bath is 0.99–67.30 μM, which shows the sensitivity 12.2 mA mM⁻¹ cm⁻². (c) The amperometric response with the successive additions of various concentration of glucose (the concentration range of glucose in electrolyte bath is 0.115–0.661 mM). (d) The corresponding fitting curves, the concentration range of glucose in electrolyte bath is 0.115–0.661 mM, which shows the sensitivity 12.3 mA mM⁻¹ cm⁻². (e) The amperometric response with the successive additions of various concentration of glucose (the concentration range of glucose in electrolyte bath is 0.925–8.486 mM). (f) The corresponding fitting curves, the concentration range of glucose in electrolyte bath is 0.067–1.373 mM.