کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7682142 | 1495823 | 2013 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Colorimetric sensing of copper(II) based on catalytic etching of gold nanoparticles
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
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چکیده انگلیسی
Based on the catalytic etching of gold nanoparticles (AuNPs), a label-free colorimetric probe was developed for the detection of Cu2+ in aqueous solutions. AuNPs were first stabilized by hexadecyltrimethylammonium bromide in NH3-NH4Cl (0.6Â M/0.1Â M) solutions. Then thiosulfate (S2O32â) ions were introduced and AuNPs were gradually dissolved by dissolved oxygen. With the further addition of Cu2+, Cu(NH3)42+ oxidized AuNPs to produce Au(S2O3)23â and Cu(S2O3)35â, while the later was oxid-ized to Cu(NH3)42+ again by dissolved oxygen. The dissolving rate of AuNPs was thereby remarkably promoted and Cu2+ acted as the catalyst. The process went on due to the sufficient supply of dissolved oxygen and AuNPs were rapidly etched. Meanwhile, a visible color change from red to colorless was observed. Subsequent tests confirmed such a non-aggregation-based method as a sensitive (LOD=5.0Â nM or 0.32Â ppb) and selective (at least 100-fold over other metal ions except for Pb2+ and Mn2+) way for the detection of Cu2+ (linear range, 10-80Â nM). Moreover, our results show that the color change induced by 40Â nM Cu2+ can be easily observed by naked eyes, which is particularly applicable to fast on-site investigations.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Talanta - Volume 112, 15 August 2013, Pages 37-42
Journal: Talanta - Volume 112, 15 August 2013, Pages 37-42
نویسندگان
Ruili Liu, Zhaopeng Chen, Shasha Wang, Chengli Qu, Lingxin Chen, Zhuo Wang,