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. 2020 Feb 14;15:40. doi: 10.1186/s11671-020-3265-7

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© The Author(s). 2020

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 5 — a The response of the CNTs/SnO₂ and CNTs/SnO₂/CuO nanocomposite to H₂S. b The sensitivity of the CNTs/SnO₂ and CNTs/SnO₂/CuO to H₂S