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. 2020 Sep 22;20(18):5434. doi: 10.3390/s20185434

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© 2020 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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Illustration of the formation of MnO₂/Mn₃O₄ composite (A), MXene/Au NPs (B), the fabrication process of AChE-Chit/MXene/Au NPs/MnO₂/Mn₃O₄/GCE biosensor for methamidophos assay (C) (reproduced with permission from reference [74]).