Study of fluorescence quenching of mercaptosuccinic acid‐capped CdS quantum dots in the presence of some heavy metal ions and its application to Hg(II) ion determination
Study of fluorescence quenching of mercaptosuccinic acid‐capped CdS quantum dots in the presence of some heavy metal ions and its application to Hg(II) ion determination
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DOI：
10.1002/bio.2623
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发表时间：
2014-11
期刊：
影响因子：
2.9
通讯作者：
M. Hosseini;A. Pirouz
中科院分区：
文献类型：
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作者：
M. Hosseini;A. Pirouz
在本研究中，CdS量子点（量子点）与巯基丁二酸（MSA）的覆盖在一个步骤中制备。利用透射电子显微镜（TEM）、光致发光（PL）和红外光谱（IR）等手段对所制备的CdS量子点的尺寸、形状、组成和光谱特性进行了表征。结果表明，所制备的量子点平均粒径为6 nm，具有良好的荧光性能，且受环境pH值的影响较大。研究了在不同pH缓冲溶液中，Ag+、Hg ~（2+）、Cu ~（2+）、Ni ~（2+）和Co ~（2+）等重金属离子与MSA修饰的CdS量子点的相互作用。基于在每种金属离子存在下量子点的荧光猝灭，根据Stern-Volmer方程检查它们的测定的可行性。研究表明，Hg（II）离子可以确定在许多共存的金属离子在缓冲pH值为5的存在下。该方法用于环境样品中Hg（II）离子的测定，结果令人满意。版权所有© 2014约翰威利父子有限公司.
In this study, CdS quantum dots (QDs) capped with mercaptosuccinic acid (MSA) were prepared in one step. The size, shape, component and spectral properties of MSA-capped CdS QDs were characterized by transmission electron microscopy (TEM), photoluminescence (PL) and infrared (IR) spectrometry. The results showed that the prepared QDs with an average diameter of 6 nm have favorable fluorescence, which is greatly influenced by the pH of the environment. The interaction of some heavy metal ions including Ag+, Hg2+, Cu2+, Ni2+ and Co2+ with MSA-capped CdS QDs was investigated in different buffering pH media. Based on the fluorescence quenching of the QDs in the presence of each of the metal ions, the feasibility of their determinations was examined according to the Stern–Volmer equation. The investigations showed that Hg(II) ions can be determined in the presence of many co-existing metal ions at a buffering pH of 5. This method was satisfactorily applied to the measurement of Hg(II) ions in some environmental samples. Copyright © 2014 John Wiley & Sons, Ltd.