Rapid exfoliation of layered covalent triazine-based frameworks into N-doped quantum dots for the selective detection of Hg2+ ions
Rapid exfoliation of layered covalent triazine-based frameworks into N-doped quantum dots for the selective detection of Hg2+ ions
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将层状共价三嗪框架快速剥离成氮掺杂量子点，用于选择性检测 Hg2 离子
DOI：
10.1039/c7ta01438d
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发表时间：
2017-05
影响因子：
11.9
通讯作者：
Fan Xiaobin
中科院分区：
文献类型：
--
作者：
Zhu Yuanzhi;Qiao Man;Peng Wenchao;Li Yang;Zhang Guoliang;Zhang Fengbao;Li Yafei;Fan Xiaobin
无金属碳量子点的研究引起了人们极大的兴趣，但快速制备具有可调光学性质的掺杂碳量子点仍是一个迫切的任务。在此，我们报道了具有层状结构的共价有机框架（基于三嗪的共价框架，CTF-1）可以快速剥离并切割成N掺杂的CQD。切割机理涉及三嗪水解和破坏三嗪与苯环之间的键。实验和密度泛函理论（DFT）计算证实，所获得的CQD的荧光主要来源于局域π-π* 跃迁引起的本征态发射，而不考虑缺陷态发射的贡献。由于其独特的化学结构，CQDs可进一步用作检测Hg 2+的高效荧光探针。本研究为以共价有机骨架为起始原料开发新型CQDs开辟了新的途径。
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.
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