Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 260, Issue -, Pages 63-69Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2017.12.187
Keywords
Lanthanide MOF; Film; In situ secondary growth; Fluorescent gas probes; Sulfur dioxide
Funding
- National Natural Science Foundation of China [51472217, 51432001, 51632008, U1609219]
- Foundation for Innovative Research Groups of the National Natural Science Foundation of China [61721005]
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Sulfur dioxide (SO2) is a common air pollutant; however, the fluorescence sensing of gaseous SO2 has never been reported yet. In this work, we developed a new strategy, named in situ secondary growth, to fabricate an Eu(III)-organic framework film on common glass for fluorescence sensing of gaseous SO2 for the first time. The UiO-66-NH2 film was firstly synthesized on common glass as a seed layer. Because of their matched components and structures, the Eu-BDC-NH2 (H2BDC-NH2, 2-aminoterephthalic acid) film can be successfully fabricated on the UiO-66-NH2 layer through in situ secondary growth. The Eu-BDC-NH2 film exhibits strong characteristic Eu3+ emissions, which can be fast and remarkably quenched by SO2 gas. The limit of detection (LOD) to SO2 gas is calculated to be 0.65 ppm and the response time is as short as 6 s. Further, we reveal that the quenching effect is caused by the intermolecular charge transfer between the ligand and SO2 molecules, as supported by the luminescence spectra and simulated calculation results. (C) 2018 Elsevier B.V. All rights reserved.
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