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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. 9 — a Optical image of graphene sensors array, SEM image of graphene device, and AFM image of graphene. b Response and c stability test of graphene sensor to 100 ppm NO₂ in dark and UV illumination. d Selectivity bar diagram, and e transient response of graphene sensor to NH₃, CO and H₂ at room temperature in dark and UV illumination. Reproduced with permission [87]. Copyright 2019, American Chemical Society