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. 2018 Jun 25;8:9598. doi: 10.1038/s41598-018-27917-w

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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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Multifunctionality of the SNAF. (a) Degradability of the HEPA, semi-HEPA, and silk nanofiber air filters. (b–d) Results of the NH₃ vapor sensing experiment at lethal concentrations (red arrows). Changes in the external color of the anthocyanin-doped silk nanofiber membranes at (b) 5000, (c) 2000, and (d) 300 ppm of NH₃. The responses are reversible (blue arrows). A color bar represents the concentration-dependence of the color changes of the silk nanofibers. (e,f) Results of the MeOH vapor sensing experiment. Time-dependent changes in the (e) fluorescence and (f) absorption spectra of the coumarin-doped silk nanofibers exposed to MeOH fume.