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首页> 外文期刊>ACS Omega >Double-Emission Ratiometric Fluorescent Sensors Composed of Rare-Earth-Doped ZnS Quantum Dots for Hg2+ Detection
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Double-Emission Ratiometric Fluorescent Sensors Composed of Rare-Earth-Doped ZnS Quantum Dots for Hg2+ Detection

机译：由稀土掺杂ZnS量子点组成的双发射比荧光传感器用于HG2 +检测

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Quantum dots (QDs) are a class of zero-dimensional nanocrystal materials, whose lengths are limited to 2–10 nm. Their unique advantages such as wide excitation spectra, narrow emission spectra, and high quantum yield make their application possible in fluorescence sensing, wherein QDs such as CdSe, CdTe, and CdS are used. Indeed, QDs have a wide range of applications in fluorescence sensing, and there have been many reports of applications based on QDs as ion probes. The emission spectra of QDs can be adjusted by changing the size of the QDs or doping them with other ions/elements. However, the high toxicity of Cd and the poor anti-interference ability of single-emission fluorescent probes greatly limit the applications of QDs in many fields. In this paper, ZnS QDs are doped with the rare-earth element Ce to form a low-toxicity double-emission ratiometric fluorescent sensor, ZnS:Ce, for Hg~(2+) detection. The results of transmission electron microscopy (TEM), X-ray diffractometry, X-ray photoelectron spectroscopy, and optical spectroscopy show that ZnS:Ce QDs were successfully synthesized. Under the optimal conditions, the concentration of Hg~(2+) was in the range of 10–100 μM, which had a linear relationship with the fluorescence intensity of the ZnS:Ce QDs: the linear correlation coefficient was 0.998, and the detection limit was 0.82 μM L~(–1). In addition, the fluorescent sensor had good selectivity for Hg~(2+), and it was successfully applied to the detection of Hg~(2+) in laboratory water samples.
机译：量子点（QDS）是一类零维纳米晶体材料，其长度限制在2-10nm。它们的独特优点如宽励磁光谱，窄发射光谱和高量子产量，使其在荧光传感中可以应用，其中使用QD等Cdse，CdTe和Cds。实际上，QDS在荧光传感中具有广泛的应用，并且基于QDS作为离子探头的应用程序有许多报道。可以通过改变QD的尺寸或用其他离子/元件掺杂它们来调节QD的发射光谱。然而，CD的高毒性和单排放荧光探针的抗干扰能力差极大地限制了QD在许多领域的应用。在本文中，ZnS QDS掺杂稀土元素Ce以形成低毒性双发射比例荧光传感器，ZnS：Ce，用于Hg〜（2+）检测。透射电子显微镜（TEM），X射线衍射测定，X射线光电子能谱和光学光谱结果的结果表明，ZNS：Ce QD成功合成。在最佳条件下，Hg〜（2+）的浓度在10-100μm的范围内，与ZnS的荧光强度有线性关系：Ce QD：线性相关系数为0.998，检测为0.998限制为0.82μmL〜（-1）。此外，荧光传感器对Hg〜（2+）具有良好的选择性，并且成功地应用于实验室水样中Hg〜（2+）的检测。

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