Ratiometric fluorescence detection of silver ions using thioflavin T-based organic/inorganic hybrid supraparticles.
Ratiometric fluorescence detection of silver ions using thioflavin T-based organic/inorganic hybrid supraparticles.
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DOI：
10.1039/c5an01146a
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发表时间：
2015-08
期刊：
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通讯作者：
Yan-Yun Li;Min Zhang;Ling-Fei Lu;Anwei Zhu;Fei Xia;Tianshu Zhou;G. Shi
中科院分区：
文献类型：
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作者：
Yan-Yun Li;Min Zhang;Ling-Fei Lu;Anwei Zhu;Fei Xia;Tianshu Zhou;G. Shi
在这项工作中，我们提出了一种新型的功能有机/无机杂化超粒子，它是由银离子(Ag(+))、碘离子(I(-))和硫代黄素T(ThT)在水溶液中自发组装而成的。THT单独在水溶液中呈弱荧光，发射峰位于494 nm，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。新谱带向546 nm方向移动，发射强度增强。我们进一步提出了一种简单的阳离子(Ag(+))和阴离子(I(-)和S(2-))的可逆荧光开关的简便策略，可用于高灵敏度和高选择性的比率荧光检测。Ag(+)的检测线性范围为100nM~10μM，检测限低至约50 nM。此外，它还可以成功地应用于逻辑门系统的操作和实际水样中银(+)的传感。
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.