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. 2022 Jun 6;9:26. doi: 10.1186/s40580-022-00317-7

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© The Author(s) 2022

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. 6 — a Components of the MXene/PANI/BC aerogel and the schematic of the MXene/PANI/BC aerogel for the applications of e-skins and gas sensors. b Selectivity. c Response of the Ti₃C₂T_x MXene/PANI/BC composite aerogel-based gas sensor to NH₃ gas for varied concentration ranges. [98] d Sensor current response profile with the UV-on of F-SnO₂ sensor [101] e fabrication process and design of the 2H-WSe₂ nanosheet sensor. f Dynamic response of 2H-WSe₂ (2D), 2H-WSe₂ (8D), and 2H-WSe₂ (12D) sensors at RT. Figure adapted from ref [109] g Schematic illustration of the fabrication process of a FET gas sensor based on n-doped graphene h Gas sensing characteristics of DETA-doped graphene [102]