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. 2020 Jun 17;20(12):3432. doi: 10.3390/s20123432

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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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Microwave sensor functionalized with Bi₂O₃-based coating for the detection of Zn in water (left), and the dependence of the reflected signal (S₁₁) response on Zn concentration (right). Reproduced with permission from [66] © Elsevier.