Department Institute of Environmental Science, and School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan, 030006, China.
J Mater Chem B. 2019 Sep 18;7(36):5502-5509. doi: 10.1039/c9tb01203f.
Herein, an easy and effective ratiometric fluorescent nanoprobe for the selective detection of Pb2+ and pyrophosphate (PPi) was developed based on label-free carbon dots (CDs). The CDs showed dual emission bands at 477 and 651 nm under a single-wavelength excitation (391 nm). Pb2+ and PPi were sequentially detected by the sensor with high reliability and accuracy via the exploitation of the fluorescence intensity ratio (F477/F651). The dual emission sensor exhibited high selectivity and excellent sensitivity for Pb2+ and PPi than for other analytes with detection limits as low as 0.055 μM and 0.089 μM, respectively. Moreover, the fluorescent CDs changed from pink to cyan and from cyan to pink and could be used as a fluorescent paper sensor for the visual detection of Pb2+ and PPi. To the best of our knowledge, this is the first report on the ratiometric fluorescence detection of Pb2+ and PPi by CDs; therefore, the as-synthesized CDs show great potential for application in the determination of Pb2+ and PPi in real samples.
本文基于无标记碳点（CDs）开发了一种用于选择性检测 Pb2+和焦磷酸（PPi）的简单、有效的比率荧光纳米探针。CDs 在单波长激发（391nm）下显示出 477nm 和 651nm 的双发射带。通过利用荧光强度比（F477/F651），传感器可以高度可靠和准确地顺序检测 Pb2+和 PPi。双发射传感器对 Pb2+和 PPi 的选择性和灵敏度均优于其他分析物，检测限分别低至 0.055μM 和 0.089μM。此外，荧光 CDs 从粉红色变为天蓝色，从天蓝色变为粉红色，可作为荧光纸传感器用于 Pb2+和 PPi 的可视化检测。据我们所知，这是首次报道通过 CDs 进行 Pb2+和 PPi 的比率荧光检测；因此，所合成的 CDs 在实际样品中测定 Pb2+和 PPi 方面具有很大的应用潜力。
