A new simple and reliable Hg2+ detection system based on anti-aggregation of unmodified gold nanoparticles in the presence of O-phenylenediamine

被引：78

作者：

Li, Yong-Long ^{[1
,2
,3
]}

Leng, Yu-Min ^{[1
,2
]}

Zhang, Yu-Jie ^{[1
,2
]}

Li, Tian-Hua ^{[1
,2
]}

Shen, Zhe-Yu ^{[1
,2
]}

Wu, Ai-Guo ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Key Lab Magnet Mat & Devices, Ningbo 315201, Zhejiang, Peoples R China

[2] Chinese Acad Sci, Div Funct Mat & Nano Devices, Ningbo Inst Mat Technol & Engn, Ningbo 315201, Zhejiang, Peoples R China

[3] Univ Sci & Technol China, Nano Sci & Technol Inst, Suzhou 215123, Jiangsu, Peoples R China

来源：

SENSORS AND ACTUATORS B-CHEMICAL | 2014年 / 200卷

关键词：

Colorimetric sensor; Gold nanoparticles; Phenylenediamine; Mercury; Anti-aggregation; Density functional theory; ATOMIC-ABSORPTION-SPECTROMETRY; MERCURIC ION; AGGREGATION; PRECONCENTRATION; CHEMISTRY; HEALTH; SILVER;

D O I：

10.1016/j.snb.2014.04.039

中图分类号：

O65 [分析化学];

学科分类号：

070302 [分析化学];

摘要：

A simple and reliable colorimetric detection system based on anti-aggregation of gold nanoparticles (AuNPs) is proposed for rapid detection of Hg2+ with high selectivity and sensitivity. O-phenylenediamine (OPD) can cause the aggregation of AuNPs due to formation of the strong covalent NH-Au bond, and then induce color change of the AuNPs solution from red to blue. However, in the presence of Hg2+, OPD prefers to combine with Hg2+ rather than AuNPs resulting in inhibition of the color change. Based on the anti-aggregation mechanism, Hg2+ can be detected by observing the color change of AuNPs solution containing OPD. After optimization, the selectivity of this Hg2+ detection system by the naked eyes and UV-vis spectra is excellent comparing with other ions. The limit of the detection CLOD) is 0.1 mu M by the naked eyes and 5.0 nM by UV-vis spectroscopy, which is lower than the mercury toxic level (10 nM) defined by US Environmental Protection Agency. It's a good linear relationship between A(520)/A(680) and Hg2+. concentration from 0.01 mu M to 2.0 mu M, which is used for the quantitative assay of Hg2+. The applicability of our detection system is also verified by analysis of Hg2+ in tap water and lake water. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：140 / 146

页数：7

共 42 条

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