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. 2019 Jul 3;9(7):974. doi: 10.3390/nano9070974

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(a) Azido-MOFs for H₂S sensing. (b,c) Emission spectra of dry MOF samples, Al-MIL-101-NH₂ (blue), In-MIL-68-NH₂ (red), Zr-UiO-66-NH₂ (black), Al-MIL-101-N₃ (green) under UV-lamp excitation (b) or fs-pulse laser excitation (c) at 343 nm. (d) Proposed schematic mechanisms of charges recombination underpinning the observed switch in emission channels. (e) Emission spectra of Al-MIL-101-N₃ in the presence of different concentrations of sodium sulfide (excited at 343 nm with a fs-pulse laser). (f) Reversed cubic fit of sodium sulfide concentration vs. measured intensity of the 565 nm band in emission spectra. (g) Detection of H₂S released from GYY4137. (h) Exposure of Al-MIL-101-N₃ to a sample of culture medium for cells with endogenously produced H₂S. Reproduced with permission from [79]. Copyright Wiley-VCH, 2016.