Ultrasensitive colorimetric detection of manganese(II) ions based on anti-aggregation of unmodified silver nanoparticles
Ultrasensitive colorimetric detection of manganese(II) ions based on anti-aggregation of unmodified silver nanoparticles
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DOI：
10.1016/j.snb.2015.08.089
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发表时间：
2016-01-01
影响因子：
8.4
通讯作者：
Zhang, Xianhui
中科院分区：
文献类型：
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作者：
He, Yi;Zhang, Xianhui
我们报道了一种基于未修饰的银纳米颗粒（AgNPs）的抗聚集性的简便、选择性和灵敏的Mn 2+离子比色测定法。在不存在Mn 2+离子的情况下，向AgNPs分散体中添加L-精氨酸引起AgNPs通过Ag-N共价相互作用聚集，并且溶液的颜色从黄色变为无色。而Mn ~（2+）离子的存在可以阻止Ag纳米粒子的聚集，这是由于Mn ~（2+）离子与L-精氨酸形成复合物，并伴随着随着Mn ~（2+）离子的增加，Ag纳米粒子的颜色从无色变为黄色。在最佳实验条件下，390 nm处的吸光度与Mn 2+离子浓度在0 ~ 700 nM和5 μ M ~ 70 μ M范围内呈线性关系，检测限为20 nM。该方法已成功用于环境水样中Mn ~（2+）离子的测定。(C)2015爱思唯尔B. V.保留所有权利。
We report a facile, selective, and sensitive colorimetric assay for Mn2+ ions based on the anti-aggregation of unmodified silver nanoparticles (AgNPs). In the absence of Mn2+ ions, the addition of L-arginine to the AgNPs dispersion caused the aggregation of AgNPs via Ag-N covalent interaction, and the color of the solution changed from yellow to colorless. While the presence of Mn2+ ions can prevent the aggregation of AgNPs due to the formation of the complex between Mn2+ ions and L-arginine, accompanying with a distinct color change from colorless to yellow with the increase of Mn2+ ions. Under the optimal experimental conditions, the absorbance at 390 nm was linearly proportional to the Mn2+ ions concentration in the ranges from 0 to 700 nM, and from 5 mu M to 70 mu M, with a detection limit of 20 nM. Also, it was successfully used for the detection of Mn2+ ions in environmental water samples. (C) 2015 Elsevier B.V. All rights reserved.