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Issue 38, 2017
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Dual-modal fluorescence and light-scattering sensor based on water-soluble carbon dots for silver ions detection

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Abstract

A facile fluorometric and light-scattering dual-modal nanosensor for silver(I) ions detection was established based on target-responsive aggregation of carbon dots/cysteine system. The synthesized water-soluble fluorescent carbon dots (CDs) by the one-pot hydrothermal method exhibited emissions peak at 441 nm under excitation at 352 nm. CDs fluorescence was quenched by Ag+via electron transfer, while the light-scattering intensity of CDs was significantly enhanced, providing a dual-modal means of analyte Ag+ detection. The relative fluorescence intensity is directly proportional to the concentration of Ag+ between 0.1 μM and 265 μM, and the detection limit is 50 nM. Moreover, the relative light-scattering intensity is proportional to the concentration of Ag+ from 10 to 4000 nM with the detection limit 2 nM. Common compounds including different types of metal ions had no significant interference in the detection mode. The new nanosensor was simple, rapid and sensitive and was applied to the detection of Ag+ in real water samples with satisfactory results. Moreover, the present CDs-based dual-modal sensor provided a promising platform for environmental sensing applications.

Graphical abstract: Dual-modal fluorescence and light-scattering sensor based on water-soluble carbon dots for silver ions detection

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Publication details

The article was received on 01 Aug 2017, accepted on 02 Sep 2017 and first published on 04 Sep 2017


Article type: Paper
DOI: 10.1039/C7AY01873H
Citation: Anal. Methods, 2017,9, 5611-5617
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    Dual-modal fluorescence and light-scattering sensor based on water-soluble carbon dots for silver ions detection

    G. Liu, C. Xuan, D. Feng, D. Hua, T. Liu, G. Qi and W. Wang, Anal. Methods, 2017, 9, 5611
    DOI: 10.1039/C7AY01873H

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