Selective deposition of HgS at the corner sites of triangular silver nanoprism and its tunable LSPR for colorimetric Hg2+ detection

被引：30

作者：

Chen, Shu ^{[1
]}

Tang, Jian ^{[1
]}

Kuang, Yangfang ^{[1
]}

Fu, Lili ^{[1
]}

Ma, Fangfang ^{[1
]}

Yang, Yuanyuan ^{[1
]}

Chen, Guanfan ^{[1
]}

Long, Yunfei ^{[1
]}

机构：

[1] Hunan Univ Sci & Technol, Key Lab Theoret Organ Chem & Funct Mol, Minist Educ, Sch Chem & Chem Engn, Xiangtan 411201, Peoples R China

来源：

SENSORS AND ACTUATORS B-CHEMICAL | 2015年 / 221卷

基金：

中国国家自然科学基金;

关键词：

Triangular silver nanoprism; Hg2+; LSPR; HgS; Colorimetric detection; GOLD NANOPARTICLES; SODIUM THIOSULFATE; AQUEOUS-MEDIA; MERCURY II; SENSOR; NANOSTRUCTURES; VISUALIZATION; AGGREGATION; IODIDE; ASSAY;

D O I：

10.1016/j.snb.2015.07.083

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

This paper developed a novel colorimetric strategy for the detection of Hg2+ based on the apical activation and passivation of unmodified triangular silver nanoprism (AgNPR). Triangular AgNPR can be rapidly etched into round nanodiscs by thiosulfate anion (S2O32-), leading to a change in colloid color from blue to yellow. However, if Hg2+ is introduced into the system together with S2O32-, changes in the shape and color of the AgNPR can be effectively prevented by the specific precipitation reaction between Hg2+ and S2O32-. The shape evolution of AgNPR was clearly revealed by the TEM measurements, including apical corrosion at the three corner sites and selectively HgS deposited over the etched zones. The spectroscopic changes in localized surface plasmon resonance (ISPR) wavelength of the AgNPR were used as the analytical signal, and a novel colorimetric platform for Hg2+ detection was established in a label-free fashion. It provides reliable and sensitive quantification with a detection limit as low as 0.2 nM and a dynamic range of 5.0 nM to 10.0 mu M. Furthermore, this method has been successfully implemented for the determination of Hg2+ in wastewater samples. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：1182 / 1187

页数：6

共 47 条

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