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A green emissive carbon-dot-based sensor with diverse responsive manners for multi-mode sensing

Abstract

Since different quenching mechanisms can endow carbon dots (CDs) with diverse responsive manners, multi-mode sensing, therefore, will be achieved by one carbon-dot-based sensor. In this work, green emissive CDs were prepared by simple hydrothermal pyrolysis of phenolphthalein and ethylenediamine at 180 oC for 5 h, with a quantum yield of 17%. The as-prepared CDs can be selectively quenched by Hg2+ ascribed to specific binding affinity causing photo-induced electron transfer (PET). Due to inner filter effect (IFE), the CDs also showed intensive fluorescent response to lemon yellow. Moreover, the CDs responded to Fe2+ or H2O2 selectively in the presence of H2O2 or Fe2+ owing to oxidative quenching (OQ) by hydroxyl radicals resulted from Fenton reaction. Via diverse responsive manners of PET, IFE and OQ, multi-mode sensing for Hg2+, lemon yellow and Fe2+, H2O2 was then achieved by one green emissive carbon-dot-based sensor. Accordingly, the linear ranges for the selective detections of Hg2+, lemon yellow, Fe2+ and H2O2 were found to be 0 – 500.0, 0 – 20.0, 0 – 90.0 and 0 – 50.0 μM, with the limits of detections as low as 5.8, 0.5, 1.20 and 1.1 μM, respectively.

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Publication details

The article was received on 11 Aug 2018, accepted on 11 Oct 2018 and first published on 11 Oct 2018


Article type: Paper
DOI: 10.1039/C8AN01552J
Citation: Analyst, 2018, Accepted Manuscript
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    A green emissive carbon-dot-based sensor with diverse responsive manners for multi-mode sensing

    X. Pan, Y. Zhang, X. Sun, W. Pan and J. Wang, Analyst, 2018, Accepted Manuscript , DOI: 10.1039/C8AN01552J

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