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Rapid exfoliation of layered covalent triazine-based frameworks into N-doped quantum dots for the selective detection of Hg2+ ions

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Abstract

Metal-free carbon quantum dots (CQDs) have attracted great interest, but the rapid preparation of doped CQDs with tunable optical properties is still an urgent task. Herein, we report that covalent organic frameworks (covalent triazine-based frameworks, CTF-1) with layered structures can be rapidly exfoliated and cut into N-doped CQDs. The cutting mechanism involves triazine hydrolysis and breaking the bonds between the triazines and benzene rings. Experiments and density functional theory (DFT) calculations confirm that the fluorescence of the obtained CQDs mainly originates from the intrinsic state emission induced by localized π–π* transitions, despite the contribution of the defect state emission. Due to their unique chemical structure, the CQDs could be further utilized as an efficient PL probe for detecting Hg2+. This study may open up new avenues for developing new kinds of CQDs using covalent organic frameworks as the starting materials.

Graphical abstract: Rapid exfoliation of layered covalent triazine-based frameworks into N-doped quantum dots for the selective detection of Hg2+ ions

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Publication details

The article was received on 15 Feb 2017, accepted on 31 Mar 2017 and first published on 31 Mar 2017


Article type: Paper
DOI: 10.1039/C7TA01438D
Citation: J. Mater. Chem. A, 2017, Advance Article
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    Rapid exfoliation of layered covalent triazine-based frameworks into N-doped quantum dots for the selective detection of Hg2+ ions

    Y. Zhu, M. Qiao, W. Peng, Y. Li, G. Zhang, F. Zhang, Y. Li and X. Fan, J. Mater. Chem. A, 2017, Advance Article , DOI: 10.1039/C7TA01438D

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