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. 2022 Jan 10;13:72. doi: 10.1038/s41467-021-27733-3

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© The Author(s) 2022

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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Fig. 3 — a Circuit block diagram of the developed NFC tag for wireless CO₂ readout. b Schematic diagram of the sensing procedure in which the UV LED and colour sensor is placed in front of the CO₂ sensitive membrane. UV excitation and red luminescence can be seen in the picture on the right with LED ON. c–e Photographs of the flexible tag printed on the 125 µm-thick PET substrate.