Technology Centre of China Tobacco Guangxi Industrial Co., LTD, Nanning, 530001, Guangxi Province, China.
Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, 650500, Yunnan Province, China.
J Fluoresc. 2020 Sep;30(5):1007-1013. doi: 10.1007/s10895-020-02571-6. Epub 2020 Jun 30.
Precise and rapid sensing of Fe(III) under concerned facile conditions is important in environmental monitoring. Herein, a facile and label-free ratiometric sensor is constructed for selective determination of Fe(III) ions by coupling second-order scattering (SOS) and fluorescence. We were synthesized fluorescent N, S-doped carbon dots (N/S-CDs) via facile one-step hydrothermal treatment with an intensive fluorescence and a weak SOS signal and high quantum yield (32%). The fluorescence of N/S-CDs was quenched whereas the intensity of SOS was relatively increased by Fe(III) ions due to aggregation-induced fluorescence quenching or enhancement. Based on this effect, a novel fluorescent ratiometric probe with the combined fluorescence and SOS is proposed for the sensing of Fe(III) ions, and with the detection limit of 83 nM and linear range of 0.1-10 μM and 10-40 μM, respectively.
在相关的简便条件下，精确和快速地感应 Fe(III) 在环境监测中很重要。在此，通过耦合二次散射（SOS）和荧光，构建了一种简便且无标记的比率传感器，用于选择性测定 Fe(III)离子。我们通过简便的一步水热处理，合成了具有强荧光和弱 SOS 信号以及高量子产率（32%）的荧光 N、S 掺杂碳点（N/S-CDs）。由于聚集诱导的荧光猝灭或增强，Fe(III)离子使 N/S-CDs 的荧光猝灭，而 SOS 的强度相对增加。基于这种效应，提出了一种新型的荧光比率探针，该探针具有结合荧光和 SOS 的功能，用于感应 Fe(III)离子，其检测限为 83 nM，线性范围分别为 0.1-10 μM 和 10-40 μM。
