کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5398444 | 1505883 | 2016 | 31 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Silver ion modulated CdS quantum dots for highly selective detection of trace Hg2+
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
In the present work, water-soluble cysteamine capped-CdS quantum dots (Cys-CdS QDs) modulated with Ag+ were employed as fluorescence sensors for the determination of Hg2+ ion. The synthesized Cys-CdS QDs exhibit relatively weak fluorescence emission, however, the emission was enhanced exclusively in the presence of Ag+ compared to other metal ions. Moreover, the fluorescence intensity of the Ag+ modulated Cys-CdS QDs (Ag+@Cys-CdS QDs) was significantly quenched in the presence of trace amounts of Hg2+ due to high-affinity metallophilic interactions between Hg2+ and Ag+. Based on this specific interaction, good selectivity towards the detection of Hg2+ over other metal ions was achieved. To gain the best sensing performance, parameters affecting the Hg2+ detection sensitivity were studied and optimized in detail. Under the optimized conditions, the fluorescence intensity of Ag+@Cys-CdS QDs decreased linearly with Hg2+ concentration in the range of 0.1-3.5 μM, with a limit of detection of around 0.09 μM. The applicability of this sensor was demonstrated by the determination of Hg2+ in drinking water samples, corresponding well with results of cold-vapor atomic absorption spectrometry.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 178, October 2016, Pages 437-445
Journal: Journal of Luminescence - Volume 178, October 2016, Pages 437-445
نویسندگان
Yuwapon Uppa, Sirinan Kulchat, Kessarin Ngamdee, Kaewklao Pradublai, Thawatchai Tuntulani, Wittaya Ngeontae,