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Issue 8, 2018, Issue in Progress
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Highly selective fluorescent carbon dots probe for mercury(II) based on thymine–mercury(II)–thymine structure

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Abstract

A novel thymine-functional fluorescent sensor was developed for Hg2+ detection with high sensitivity and selectivity. The synthesis of the fluorescent sensor took two steps (1) the synthesis of amine-functionalized carbon dots (CDs-PEI); and (2) the attaching of thymine moieties on to the surface of the CDs-PEI through EDC/NHS coupling chemistry to obtain the thymine-functional fluorescence carbon dots (CDs-Thy). The CDs-Thy were successfully applied to detect Hg2+ by quenching fluorescence with a rapid response through photoinduced electron transfer with the formation of T–Hg2+–T structures. The linear concentration range of Hg2+ is 0–1.0 μmol L−1 and a limit of detection (LOD) as low as 3.5 × 10−8 mol L−1 was obtained. Moreover, the CDs-Thy can resist interference from other metal ions and anions. The CDs-Thy were also used for the Hg2+ detection in water samples and the recoveries were from 90% to 104%. Due to the simplicity and effectiveness, it shows great promise as a potential sensing platform for Hg2+.

Graphical abstract: Highly selective fluorescent carbon dots probe for mercury(ii) based on thymine–mercury(ii)–thymine structure

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Publication details

The article was received on 18 Oct 2017, accepted on 12 Jan 2018 and first published on 22 Jan 2018


Article type: Paper
DOI: 10.1039/C7RA11487G
Citation: RSC Adv., 2018,8, 3982-3988
  • Open access: Creative Commons BY license
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    Highly selective fluorescent carbon dots probe for mercury(II) based on thymine–mercury(II)–thymine structure

    Y. Li, Z. Zhang, H. Yang, G. Shao and F. Gan, RSC Adv., 2018, 8, 3982
    DOI: 10.1039/C7RA11487G

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