Colorimetric Sensing of Silver(I) and Mercury(II) Ions Based on an Assembly of Tween 20-Stabilized Gold Nanoparticles
Colorimetric Sensing of Silver(I) and Mercury(II) Ions Based on an Assembly of Tween 20-Stabilized Gold Nanoparticles
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DOI：
10.1021/ac1007909
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发表时间：
2010-08-15
影响因子：
7.4
通讯作者：
Tseng, Wei-Lung
中科院分区：
文献类型：
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作者：
Lin, Cheng-Yan;Yu, Cheng-Ju;Tseng, Wei-Lung
我们已经开发了一种快速和均匀的方法，用于高选择性检测Hg 2+和Ag+使用吐温20修饰的金纳米粒子（AuNPs）。柠檬酸盐离子被发现仍然被吸附在Au表面上时，柠檬酸盐封端的金纳米粒子与吐温20，这稳定了柠檬酸盐封端的金纳米粒子对高离子强度的条件下进行改性。当柠檬酸盐离子还原Hg 2+和Ag+以在AuNP表面形成Hg-Au合金和Ag时，从NP表面去除吐温20。结果，AuNP在高离子强度溶液下不稳定，导致NP聚集。通过电感耦合等离子体质谱和能量色散X射线光谱证明了在AuNPs表面上形成Hg-Au合金或Ag。吐温20-金纳米颗粒可以选择性地检测Hg 2+和Ag+的浓度低至0.1和0.1 μ M的NaCl和EDTA的存在下，分别。此外，该探针能够分析具有对应于IpM的最小可检测浓度的AgNP。该探针已成功应用于饮用水和海水中Hg 2+、饮用水中Ag+和饮用水中AgNPs的检测。
We have developed a rapid and homogeneous method for the highly selective detection of Hg2+ and Ag+ using Tween 20-modified gold nanoparticles (AuNPs). Citrate ions were found to still be adsorbed on the Au surface when citrate-capped AuNPs were modified with Tween 20, which stabilizes the citrate-capped AuNPs against conditions of high ionic strength. When citrate ions had reduced Hg2+ and Ag+ to form Hg-Au alloys and Ag on the surface of the AuNPs, Tween 20 was removed from the NP surface. As a result, the AuNPs were unstable under a high-ionic-strength solution, resulting in NP aggregation. The formation of Hg-Au alloys or Ag on the surface of the AuNPs was demonstrated by means of inductively coupled plasma mass spectroscopy and energy-dispersive X-ray spectroscopy. Tween 20-AuNPs could selectively detect Hg2+ and Ag+ at concentrations as low as 0.1 and 0.1 mu M in the presence of NaCl and EDTA, respectively. Moreover, the probe enables the analysis of AgNPs with a minimum detectable concentration that corresponds to 1 pM. This probe was successfully applied to detect Hg2+ in drinking water and seawater, Ag+ in drinking water, and AgNPs in drinking water.