期刊
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
卷 412, 期 6, 页码 1317-1324出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s00216-019-02353-5
关键词
Metal-organic frameworks; Ratiometric fluorescence nanoprobe; Copper; Carbon dots; Gold nanoclusters
资金
- National Natural Science Foundation of China [21775089, 51862014, 21665010, 21705151] Funding Source: Medline
- the open foundation of Key Laboratory of Molecular and Nano Probes, Ministry of Education, Shandong Normal University [2018KLMNP06] Funding Source: Medline
- Shandong Provincial Key Laboratory of Clean Production of Fine Chemicals [2019FCCEKL07] Funding Source: Medline
- Key Research and Development Program of Jining City [2018ZDGH032] Funding Source: Medline
- Outstanding Youth Foundation of Shandong Province [ZR2017JL010] Funding Source: Medline
Herein, a dual-emission metal-organic framework based ratiometric fluorescence nanoprobe was reported for detecting copper(II) ions. In particular, carbon dots (CDs) and gold nanoclusters (AuNCs) were embedded into ZIF-8 (one of the classical metal-organic frameworks) to form CDs/AuNCs@ZIF-8 nanocomposites, which exhibited dual-emission peaks at UV excitation. In the presence of Cu2+, the fluorescence attributed to AuNCs can be rapidly quenched, while the fluorescence of CDs serves as reference with undetectable changes. Therefore, the CDs/AuNCs@ZIF-8 nanocomposites were utilized as a ratiometric fluorescence nanoprobe for sensitive and selective detection of Cu2+. A good linear relationship between the ratiometric fluorescence signal of CDs/AuNCs@ZIF-8 and Cu2+ concentration was obtained in the range of 10(-3)-10(3) mu M, and the detection limit was as low as 0.3324 nM. The current ratiometric fluorescence nanoprobe showed promising prospects in cost-effective and rapid determination of Cu2+ ions with good sensitivity and selectivity. Furthermore, this nanoprobe has been successfully applied for the quantitative detection of Cu2+ in serum samples, indicating its value of practical application. Carbon dots (CDs) and gold nanoclusters (AuNCs) were embedded into metal-organic frameworks (ZIF-8) to form CDs/AuNCs@ZIF-8 nanocomposites, which exhibited dual-emission peaks at 365 nm excitation. In the presence of Cu2+, the fluorescence emission peak at 574 nm can rapidly respond by quenching, while the fluorescence at 462 nm serves as reference with undetectable changes.
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