巯基乙胺封端的硫化镉量子点作为一种利用荧光增强和长波光谱位移测定铜离子的荧光传感器。
Cysteamine capped CdS quantum dots as a fluorescence sensor for the determination of copper ion exploiting fluorescence enhancement and long-wave spectral shifts.
作者信息
Boonmee Chanida, Noipa Tuanjai, Tuntulani Thawatchai, Ngeontae Wittaya
机构信息
Department of Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand.
Department of Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand; Faculty of Science and Engineering, Kasetsart University Chalermphrakiat Sakon Nakhon Province Campus, Sakon Nakhon 47000, Thailand.
出版信息
Spectrochim Acta A Mol Biomol Spectrosc. 2016 Dec 5;169:161-8. doi: 10.1016/j.saa.2016.05.007. Epub 2016 May 8.
We described a turn-on fluorescence sensor for the determination of Cu(2+) ions, utilizing the quantum confinement effect of cadmium sulfide quantum dots capped with cysteamine (Cys-CdS QDs). The fluorescence intensity of the Cys-CdS QDs was both enhanced and red shifted (from blue-green to yellow) in the presence of Cu(2+). Fluorescence enhancement was linearly proportional to the concentration of Cu(2+) in the concentration range 2 to 10μM. Other cations at the same concentration level did not significantly change the intensity and spectral maxima of Cys-CdS QDs, except Ag(+). The limit of detection was 1.5μM. The sensor was applied to the determination of Cu(2+) in (spiked) real water samples and gave satisfactory results, with recoveries ranging from 96.7 to 108.2%, and with RSDs ranging from 0.3 to 2.6%.
我们描述了一种用于测定铜离子（Cu(2+)）的开启型荧光传感器，该传感器利用了用半胱胺（Cys）包覆的硫化镉量子点（Cys-CdS QDs）的量子限域效应。在有Cu(2+)存在的情况下，Cys-CdS QDs的荧光强度增强且发生红移（从蓝绿色变为黄色）。在2至10μM的浓度范围内，荧光增强与Cu(2+)的浓度呈线性比例关系。除了银离子（Ag(+)）外，相同浓度水平的其他阳离子不会显著改变Cys-CdS QDs的强度和光谱最大值。检测限为1.5μM。该传感器应用于（加标）实际水样中Cu(2+)的测定，结果令人满意，回收率在96.7%至108.2%之间，相对标准偏差（RSD）在0.3%至2.6%之间。
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