Department of Chemistry, College of Sciences, Shanghai University, Shanghai, 200444, People's Republic of China.
J Fluoresc. 2022 Sep;32(5):1815-1823. doi: 10.1007/s10895-022-02981-8. Epub 2022 Jun 15.
In this work, the fluorescent sensor based on fluorescence resonance energy transfer (FRET) and electrostatic interaction (EI) was prepared for the ratiometric and visual detecting S. The FRET fluorescent sensor consists of two fluorophores, with carbon dots (CDs) as energy donors and silver nanoclusters (Ag NCs) as acceptors. At 390 nm excitation, CDs and Ag NCs showed two well-separated peaks at 445 nm and 660 nm, separately. The existence of S caused the red fluorescence at 660 nm to be quenched, whereas the blue fluorescence at 445 nm was restored, and the fluorescence color of the ratiometric sensor changed from pink to blue. It could be employed in ratiometric and visual detecting S. The linear range of quantitative detection S was 0.5-100 μM, and its detection limit was 0.35 μM. CDs-Ag NCs could be used for detecting S in mineral water and tap water. The results showed that the FRET ratiometric fluorescent sensor exhibits good anti-interference and high selectivity for detecting S in environmental water samples.
在这项工作中，基于荧光共振能量转移（FRET）和静电相互作用（EI）的荧光传感器被制备用于 S 的比率和可视化检测。FRET 荧光传感器由两个荧光团组成，其中碳点（CDs）作为供体，银纳米簇（Ag NCs）作为受体。在 390nm 激发下，CDs 和 Ag NCs 在 445nm 和 660nm 处分别显示出两个很好分离的峰。S 的存在导致 660nm 处的红色荧光被猝灭，而 445nm 处的蓝色荧光得到恢复，比率传感器的荧光颜色从粉红色变为蓝色。它可以用于 S 的比率和可视化检测。定量检测 S 的线性范围为 0.5-100μM，检测限为 0.35μM。CDs-Ag NCs 可用于检测矿泉水和自来水中的 S。结果表明，FRET 比率荧光传感器在环境水样中对 S 的检测具有良好的抗干扰性和高选择性。
