Li Yan-Yun, Zhang Min, Lu Ling-Fei, Zhu Anwei, Xia Fei, Zhou Tianshu, Shi Guoyue
School of Chemistry and Molecular Engineering, East China Normal University, 500 Dongchuan Road, Shanghai 200241, P. R. China.
Analyst. 2015 Sep 7;140(17):6108-13. doi: 10.1039/c5an01146a.
In this work, we present a new type of functional organic/inorganic hybrid supraparticle that spontaneously assembles from silver ions (Ag(+)), iodide ions (I(-)) and thioflavin T (ThT) under aqueous solution conditions. ThT alone in aqueous solution was weakly fluorescent with an emission band at 494 nm, which was related to the monomer. However, in the above-mentioned hybrid supraparticle (i.e., ThT@AgI SP) structure, the ThT monomer can form a dimer with a new emission band. The new band shifted to 546 nm and the emission intensity increased. We further present a facile strategy of reversible fluorescence switching of ThT by a simple cation (Ag(+)) and anions (I(-) and S(2-)), which can be employed for the ratiometric fluorescence detection of Ag(+) with high sensitivity and selectivity. The linear range of detecting Ag(+) was from 100 nM to 10 μM, with a limit of detection as low as approximately 50 nM. Moreover, it can be successfully applied for the operation of a logic gate system and to the sensing of Ag(+) in real water samples.
在这项工作中，我们展示了一种新型的功能性有机/无机杂化超粒子，它在水溶液条件下由银离子（Ag(+)）、碘离子（I(-)）和硫黄素T（ThT）自发组装而成。单独存在于水溶液中的ThT荧光较弱，在494nm处有一个发射带，这与单体有关。然而，在上述杂化超粒子（即ThT@AgI SP）结构中，ThT单体可以形成具有新发射带的二聚体。新的发射带移至546nm，发射强度增加。我们还提出了一种通过简单阳离子（Ag(+)）和阴离子（I(-)和S(2-)）对ThT进行可逆荧光切换的简便策略，该策略可用于对Ag(+)进行高灵敏度和高选择性的比率荧光检测。检测Ag(+)的线性范围为100 nM至10 μM，检测限低至约50 nM。此外，它可以成功应用于逻辑门系统的运行以及实际水样中Ag(+)的传感。
