期刊
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
卷 227, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2019.117703
关键词
Ratiometric fluorescent sensor; Covalent organic framework; Rhodamine B; N-doped carbon dots; Hg2+
类别
资金
- National Natural Science Foundation of China [21465015, 21665012]
- Ground Plan of Science and Technology Projects of Jiangxi Educational Committee [KJLD14023]
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education, Jiangxi Normal University [KLFS-KF-201708, KLFS-KF-201713]
- Innovation Foundation for graduate students of Jiangxi Normal University [YC2019-S123]
Covalent-organic frameworks (COFs) are new porous crystalline materials owning outstanding stability, adsorbability and hypotoxicity. The assembly of fluorescence probes into porous COF provides a good method for ratiometric fluorescence detection avoiding the toxic effects of fluorescence probes to the samples. Herein, a two-dimensional COF (TAPT-DHTA-COF) was employed as a host to encapsulate N-doped carbon dots (NCDs) and Rhodamine B (RhB) (NCDs-RhB@COF). NCDs and RhB were uniformly assembled into the pores of TAPT-DHTA- COF based on the hydrogen bond. The as-prepared NCDs-RhB@COF nanocomposites exhibited blue emission of NCDs at 440 nm and red emission of RhB at 570 nm at excitation of 340 nm. After the addition of Hg2+, the blue emission became weaker while the red emission was enhanced due to the strong coordination between NCDs-RhB@COF and Hg2+. This on-off fluorescence probe was applied in detection of trace Hg2+ with linear range of 0.048-10 mu M and detection limit of 15.9 nM together with appropriate selectivity, acceptable sensitivity and stability. The work shreds some light for COF as platform to construct ratiometric fluorescent sensor for industrial and biological application. (C) 2019 Elsevier B.V. All rights reserved.
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