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. 2020 Mar 11;12:71. doi: 10.1007/s40820-020-0407-5

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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. 13 — a NH₃ response to PPy-Zn₂SnO₄, PPy, and Zn₂SnO₄. b Curve of concentration versus response. c Curve of a single response and recovery to NH₃. d Schema of sensing mechanism. Reproduced with permission [121]. Copyright 2018, Elsevier. e Schema of sensing mechanism. f Gas response of PANI, solid In₂O₃/PANI and hollow In₂O₃/PANI. Reproduced with permission [122]. Copyright 2016, Springer