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Issue 18, 2015
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Simple hydrothermal preparation of carbon nanodots and their application in colorimetric and fluorimetric detection of mercury ions

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Abstract

The present article reports on the one-step rapid green synthesis of water-soluble, fluorescent carbon nanodots (C-dots) with a quantum yield of 8.9%. Compared with previous hydrothermal methods, the proposed method is performed at lower temperature and results in larger size (20–30 nm) C-dots. We observed that UV-Vis absorbance at 302 nm of C-dots shows a significant linear correlation with the concentration of Hg2+ added, which indicates that the as-prepared carbon dots could act as a colorimetric probe for Hg2+. The linear range of this colorimetric probe is 1.0 × 10−9–7.0 × 10−7 mol L−1 and the detection limit is 5.7 × 10−10 mol L−1. Simultaneously, the fluorescence of the C-dots in pH 5.0 phosphate buffer solution can be dramatically quenched by Hg2+, whereas it is nearly unaffected by other metal ions. A good linear relationship exists between the quenching efficiency (F0/F) and the concentration of Hg2+ in the range of 7.0 × 10−9–7.0 × 10−7 mol L−1 with a detection limit (3σ) of 5.5 × 10−10 mol L−1. This dual probe for Hg2+ exhibits excellent performance in polluted tap water samples analysis, suggesting its promising application in the future.

Graphical abstract: Simple hydrothermal preparation of carbon nanodots and their application in colorimetric and fluorimetric detection of mercury ions

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Publication details

The article was received on 20 May 2015, accepted on 17 Jul 2015 and first published on 17 Jul 2015


Article type: Paper
DOI: 10.1039/C5AY01301A
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Citation: Anal. Methods, 2015,7, 7540-7547
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    Simple hydrothermal preparation of carbon nanodots and their application in colorimetric and fluorimetric detection of mercury ions

    Y. Liang, H. Zhang, Y. Zhang and F. Chen, Anal. Methods, 2015, 7, 7540
    DOI: 10.1039/C5AY01301A

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