镝(III)诱导单层石墨烯量子点聚集发射猝灭效应用于人工湿地中磷酸盐的选择性检测。
Dy(III)-induced aggregation emission quenching effect of single-layered graphene quantum dots for selective detection of phosphate in the artificial wetlands.
机构信息
Key Laboratory of Luminescence and Real-Time Analytical Chemistry (Southwest University), Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing 400715, China.
Chongqing Key Laboratory of Biomedical Analysis, Chongqing Science & Technology Commission, College of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China.
出版信息
Talanta. 2019 May 1;196:100-108. doi: 10.1016/j.talanta.2018.12.032. Epub 2018 Dec 12.
Carbon quantum dots (CQDs), prepared by one-step hydrothermal treatment of perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA) and triethylamine (TEA), could be exfoliated or delaminated into single-layered graphene quantum dots (s-GQDs) with methanol for the first time, with fluorescence (FL) emission at 500 nm when excited at 417 nm. The s-GQDs, with more sufficient carboxyl groups on the surface than CQDs, could be induced to be aggregated by metal ion dysprosium (Dy), resulting in aggregation-induced emission quenching effect subsequently. However, the presence of phosphate (PO) destroys the Dy-induced aggregates of s-GQDs owing to the strong coordination between Dy and PO, inducing the FL emission recovery of the s-GQDs and providing selective detection method of PO in the artificial wetlands with the linear range of 0.2-30 μM and determination limit of 0.1 μM (3σ).
碳量子点（CQDs）通过一步水热处理均苯三甲酸酐（PTCDA）和三乙胺（TEA）制备而成，首次可以用甲醇将其剥离或分层为单层石墨烯量子点（s-GQDs），在 417nm 激发时发出 500nm 的荧光（FL）发射。与 CQDs 相比，表面具有更多羧基的 s-GQDs 可以被金属离子镝（Dy）诱导聚集，从而随后产生聚集诱导的荧光猝灭效应。然而，由于 Dy 和 PO 之间的强配位，磷酸盐（PO）的存在会破坏 s-GQDs 的 Dy 诱导聚集，从而使 s-GQDs 的 FL 发射恢复，并为人工湿地中 PO 的选择性检测提供了一种方法，其线性范围为 0.2-30 μM，检测限为 0.1 μM（3σ）。
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