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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. 14 — Gas response to different concentrations of NO₂ gas at room temperature under red light illumination of a Au/MoS₂/Au, b Gr/MoS₂/Gr, and c Au/Gr-MoS₂-Gr/Au device. Reproduced with permission [120]. Copyright 2019, American Chemical Society. d Schematic representation of an n–p-type van der Waals homojunction of MoS₂ under UV illumination. e Gas sensing mechanism of the n–p-type van der Waals homojunction of MoS₂ via energy band diagram. Reproduced with permission [126]. Copyright 2020, WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim