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Fluorometric determination of mercury(II) based on dual-emission metal-organic frameworks incorporating carbon dots and gold nanoclusters

Authors
  • Guo, Manli1
  • Chi, Jingtian1
  • Li, Yijing1
  • Waterhouse, Geoffrey I. N.1, 2
  • Ai, Shiyun1
  • Hou, Juying1
  • Li, Xiangyang1
  • 1 Shandong Agricultural University, Taian, Shandong, 271018, People’s Republic of China , Taian (China)
  • 2 The University of Auckland, Auckland, 1142, New Zealand , Auckland (New Zealand)
Type
Published Article
Journal
Microchimica Acta
Publisher
Springer-Verlag
Publication Date
Sep 01, 2020
Volume
187
Issue
9
Identifiers
DOI: 10.1007/s00604-020-04508-z
Source
Springer Nature
Keywords
License
Yellow

Abstract

Carbon dots and gold nanoclusters co-encapsulated by zeolitic imidazolate framework-8 (CDs/[email protected]) have been obtained at room temperature. The composite has been applied to the ratiometric fluorescence determination of mercury(II). The composite shows fluorescence emission maxima at 440 and 640 nm under 360 nm excitation, due to the CDs and AuNCs, respectively (associated quantum yields were 18% and 17%, respectively). In the presence of Hg2+, the fluorescence at about 640 nm is quenched, while the fluorescence at about 440 nm is unaffected. The CDs/[email protected] composite allows the sensitive detection of Hg2+, with the fluorescence intensity ratio (I640/I440) decreasing linearly with Hg2+ concentration over the range 3–30 nM. The fluorescence emission of the composite changes color from red to blue with increasing Hg2+ under UV excitation, which can easily be discerned visually. This visual detection of Hg2+ is due to the high fluorescence quantum yields of the CDs and AuNCs and the ~ 200 nm separation between the two emission maxima. Graphical abstract(A) Schematic diagram showing the operating principle of the determination for Hg(II). (B) Digital graph of the solutions in absence and presence of 30 nM Hg(II) under a portable UV lamp

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