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. 2019 Dec 5;14:365. doi: 10.1186/s11671-019-3213-6

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© The Author(s). 2019

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. 9 — a The response–recovery of the 5%Ag-In₂O₃ toward 1 ppm HCHO gas for 6 cycles at 30 °C. b Responses of 5%Ag-In₂O₃ sensor toward 1 ppm of HCHO under different humidity conditions at 30 °C. c Long-term stability tests of 5%Ag-In₂O₃ sensor toward 1 ppm HCHO after continuous evaluation for 36 days at 30 °C