Journal
NANOTECHNOLOGY
Volume 32, Issue 50, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1361-6528/ac280f
Keywords
quantum dots; mesoporous silica; Forster Resonance Energy Transfer; Cd2+; selectively visual detection
Funding
- National Nature Science Foundation of China [51773163]
- Sanya Science and Education Innovation Park of Wuhan University of Technology [2020KF0025]
- Fundamental Research Funds for the Central Universities [WUT:2020III038GX]
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A stable fluorescent probe based on silica encapsulated quantum dots has been developed for rapid, sensitive and selective detection of cadmium ion. The probe exhibits a sensitive fluorescence response with a detection limit of 1.25 mu M and shows promising sensing performances in tap water and rice-washed water samples, indicating great potential for practical application.
Cadmium ions have been of crucial concern due to the high biological toxicity and serious environmental risks. Various fluorescent Cd-sensitive probes have been reported with improved sensing properties, but still severely suffer from poor stability and insufficient selectivity. In this work, a stable fluorescent probe based on silica encapsulated quantum dots (QDs) have been developed for rapid, sensitive and selective detection of cadmium ion. To improve fluorescence stability, the strategy of mesoporous silica encapsulation was adopted, in which the mesoporous silica shell offers numerous channels for Cd2+. Further, the Forster Resonance Energy Transfer (FRET) system, where QDs@mSiO(2) and rhodamine B (RB) are used as donors and acceptors respectively, has been constructed, in which the mesoporous silica shell also serves as spacers with tunable thickness for controlling the QD-RB distance. Under optimal conditions, the probes possess a sensitive fluorescence response with a detection limit of 1.25 mu M. Visual detection can be realized by the obvious fluorescence changes of the FRET system. In addition, the FRET system shows promising sensing performances both in tap water samples and rice-washed water samples, confirming a great potential for practical application.
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