کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5009118 | 1462039 | 2017 | 8 صفحه PDF | دانلود رایگان |
- We presented a colorimetric assay to detect Hg2+ using iodide responsive Cu@Au nanoparticles.
- Iodide can induce an obvious color change of the Cu@Au NP solution from gray to red.
- This method exhibits a wide response range from 0.1Â nM to 70Â nM, and the LOD is 0.037Â nM.
- Cu@Au NPs-based colorimetric probe exhibits excellent selectivity for Hg2+.
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 colorimetric 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 0.1Â nM to 70Â nM, and the detection limit (LOD) of 0.037Â nM is obtained. Besides, our Cu@Au NPs-based colorimetric sensor exhibits excellent selectivity for Hg2+.
Journal: Sensors and Actuators B: Chemical - Volume 252, November 2017, Pages 663-670