期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 265, 期 -, 页码 104-109出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2018.03.028
关键词
Eu/Tb-MOF; Dual-emitting luminescence; Ratiometric fluorescent detection; MeOH recognition
资金
- National Natural Science Foundation of China [21471134, 21571158, 21601160]
- Innovation Scientists and Technicians Troop Construction Projects of Henan Province [152101510003]
- Plan for Scientific Innovation Talent of Henan Province [154200510011]
- Program for Science & Technology Innovative Research Team in University of Henan Province [15IRTSTHN-002]
- Startup Fund for PhDs of Natural Scientific Research of Zhengzhou University of Light Industry [2015BSJJ042]
Ratiometric fluorescence sensor has drawn much attention due to its decreased environment influence and easy-to-differentiate color and intensity change. In this work, a bimetallic metal-organic framework (MOF), namely {(Me2NH2)[Tb0.9Eu0.1(OBA)(2)]center dot(Hatz)center dot(H2O)(1.5)}(n) (1, H(2)OBA= 4,4 '-oxybis(benzoate) acid, Hatz = 3-amino-1,2,4-triazole) with a yellow-emission signal has been successfully fabricated by appealing to the lanthanide doping strategy. In this MOF, the emission band of OBA(2-) ligand matches well with the excitation energy of lanthanide ions (Eu3+ and Tb3+) which leads to high energy transfer from the ligand to the lanthanide ions to provide dual emission peaks for the both Eu3+ and Tb3+ ions. This MOF shows high fluorescence stability with the ratio of its two emission peaks (545 nm and 618 nm) do not change with the change of Ln-MOF sensor concentration used as the merit of ratiometric fluorescence detection. Subsequently, we choose this MOF as a fluorescent sensor for various volatile organic molecules, and the results show that it is capable of decoding methanol with an obvious color change and unique emission intensity ratio of Tb3+ ion to Eu3+ ion, both in the solution and vapor state. Good detection reproducibility and fast response could be achieved in this sensor. (C) 2018 Elsevier B.V. All rights reserved.
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