Ministry of Education Key Laboratory of Analysis and Detection for Food Safety, Department of Chemistry, Fuzhou University, Fujian, China.
Anal Chem. 2012 Jul 17;84(14):6220-4. doi: 10.1021/ac3012126. Epub 2012 Jun 25.
A novel sensing system has been designed for Cu(2+) ion detection based on the quenched fluorescence (FL) signal of branched poly(ethylenimine) (BPEI)-functionalized carbon quantum dots (CQDs). Cu(2+) ions can be captured by the amino groups of the BPEI-CQDs to form an absorbent complex at the surface of CQDs, resulting in a strong quenching of the CQDs' FL via an inner filter effect. Herein, we have demonstrated that this facile methodology can offer a rapid, reliable, and selective detection of Cu(2+) with a detection limit as low as 6 nM and a dynamic range from 10 to 1100 nM. Furthermore, the detection results for Cu(2+) ions in a river water sample obtained by this sensing system agreed well with that by inductively couple plasma mass spectrometry, suggesting the potential application of this sensing system.
一种基于支化聚乙烯亚胺（BPEI）功能化碳量子点（CQDs）荧光猝灭（FL）信号的新型 Cu（2+）离子传感系统已被设计出来。Cu（2+）离子可以通过 BPEI-CQDs 的氨基捕获，在 CQDs 表面形成吸收络合物，通过内滤效应强烈猝灭 CQDs 的 FL。在此，我们已经证明，这种简单的方法可以快速、可靠、选择性地检测 Cu（2+），检测限低至 6 nM，动态范围为 10 至 1100 nM。此外，该传感系统对河水样品中 Cu（2+）离子的检测结果与电感耦合等离子体质谱法吻合较好，表明该传感系统具有潜在的应用价值。
