文献类型：期刊文献

英文题名：Iodide-responsive Cu@Au nanoparticle-based colorimetric assay for sensitive mercury (II) detection

作者：Li, Li[1];Zhang, Laiping[1];Lou, Tianhong[2];Chen, Zhengbo[2]

第一作者：李丽

通讯作者：Chen, ZB[1]

机构：[1]Xinxiang Univ, Coll Chem & Chem Engn, Xinxiang 453003, Peoples R China;[2]Capital Normal Univ, Dept Chem, Beijing 100048, Peoples R China

第一机构：新乡学院化学化工学院

通讯机构：[1]corresponding author), Capital Normal Univ, Dept Chem, Beijing 100048, Peoples R China.

年份：2017

卷号：252

起止页码：663-670

外文期刊名：SENSORS AND ACTUATORS B-CHEMICAL

收录：;EI(收录号：20172503790647);Scopus(收录号：2-s2.0-85020729590);WOS:【SCI-EXPANDED(收录号:WOS:000408277500078)】；

基金：All authors gratefully acknowledge the financial support of Scientific Research Project of Beijing Educational Committee (Grant No. KM201710028009), Youth Innovative Research Team of Capital Normal University, and Key Scientific and Technological Project of Henan Province (122102210406).

语种：英文

外文关键词：Mercury ion; Cu@Au nanoalloys; Iodide; Colorimetric; Gold amalgam

摘要：Mercury ion (Hg2+) has been recognized as one of the most hazardous metal pollutants that can cause deleterious effects on human health and the environment even at low concentrations. Therefore, monitoring of Hg2+ levels in water is very important in terms of waste management, environmental analysis, toxicology, water safety, and water quality. Here, we provide a highly sensitive and selective colon metric assay to detect Hg2+ in aqueous solution using iodide responsive core-shell Cu@Au nanoparticles (Cu@Au NPs). Iodide can induce an appreciable color change of the Cu@Au NP solution from gray to red by transforming the interconnected, irregularly shaped nanoparticles to the single, separated, and nearly spherical ones. In the presence of Hg2+, the formation of Cu@Au-Hg nanoalloys can protect the Cu@Au NPs from absorbing more iodide in the solution, the solution color turns pale red. When Hg absorbed on the surface of Cu@Au NPs reaches saturation, Hg prevents iodide from reacting with Cu@Au NPs, thus the solution color remains gray. This method exhibits a wide response range from 0.1 nM to 70 nM, and the detection limit (LOD) of 0.037 nM is obtained. Besides, our Cu@Au NPs-based colorimetric sensor exhibits excellent selectivity for Hg2+. (C) 2017 Elsevier B.V. All rights reserved.