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. 2018 Apr 27;9:1695. doi: 10.1038/s41467-018-04119-6

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© The Author(s) 2018

Open Access This 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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 8 — Micro-structure of film 1 and its responses to MAPA. a Fluorescence microscope image of the film (λ_ex = 488 nm). b Computer displayed results from the measurements at different MAPA vapor concentrations monitored with the homemade device (the saturated vapor pressure of MAPA is ~220 ppm at 25 °C¹⁶). Note: (1) each measurement was repeated three times; (2) inset is a plot of the average response to the vapor concentration, where the error bars are drawn from maximum to minimum responses