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. 2020 Aug 13;12:164. doi: 10.1007/s40820-020-00503-4

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© The Author(s) 2020

Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 5 — Response–recovery curves of a SnO₂ monolayer array film towards 10 ppm NO₂ under different light intensity and b SnO₂ film with different thickness towards 100–500 ppb NO₂ under the UV light intensity of 3.09 mW cm⁻², c corresponding sensor responses to 10 ppm NO₂. d Sensing mechanism of the SnO₂ monolayer sensing film towards NO₂ gas under UV light irradiation. Reproduced with permission [67]. Copyright 2019, WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim