期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 245, 期 -, 页码 641-647出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2017.02.029
关键词
Metal-organic frameworks; Carbon dots; Ratiometric fluorescent sensor; Cu2+; 2,6-Pyridinedicarboxylic acid
资金
- National Natural Science Foundation of China [21465014, 21465015, 21665012]
- Natural Science Foundation of Jiangxi Province [20143ACB21016]
- Ministry of Education by the Specialized Research Fund for the Doctoral Program of Higher Education [20133604110002]
- Ground Plan of Science and Technology Projects of Jiangxi Educational Committee [KILD14023]
Here, a novel fluorescent carbon dots (CDs)@Eu-2,6-pyridinedicarboxylic acid (DPA) metal organic frameworks (MOFs) was synthesized by encapsulating CDs into the Eu-DPA MOFs for the detection of Cu2+. The as-prepared CDs@Eu-DPA MOFs fluorescent probe was investigated by transmission electron microscopy, Fourier transform-infrared spectroscopy and fluorescence spectroscopy. The results showed the CDs@EuDPA MOFs exhibited the uniform ball-flower-like nanostructures and were very stable in aqueous solution due to their nanoscaled size and the ball-flower-like nanostructures. The CDs@Eu-DPA MOFs could emit two kinds of fluorescence which originated from CDs and Eu-DPA MOFs, respectively under a single wavelength excitation at 275 nm. In the presence of Cu2+, the fluorescence of Eu-DPA MOFs decreased and the fluorescence of CDs kept constant to result in ratiometric fluorescent response toward Cu2+ when they were used as the recognition parts and the reference, respectively. The obtained CDs@Eu-DPA MOFs for the detection of Cu2+ showed a wide linear range (50 nM-10 mu M) and a low detection limit (26.3 nM) with high sensitivity, stability and selectivity. The work provides a good method to construct fluorescent sensors based on MOFs. (C) 2017 Elsevier B.V. All rights reserved.
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