Kailasa Suresh Kumar, Chandel Madhurya, Mehta Vaibhavkumar N, Park Tae Jung
Department of Applied Chemistry, S. V. National Institute of Technology, Surat 395 007, India; Department of Chemistry, Institute of Interdisciplinary Convergence Research, Research Institute of Halal Industrialization Technology, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea.
Department of Applied Chemistry, S. V. National Institute of Technology, Surat 395 007, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2018 Apr 15;195:120-127. doi: 10.1016/j.saa.2018.01.038. Epub 2018 Jan 31.
In this work, we describe the role of ligand chemistry on the surfaces of silver nanoparticles (Ag NPs) for tuning their analytical applications. The citrate and melamine (MA) molecules were used as ligands for the surface modification of Ag NPs. The addition of Cr ion in citrate-Ag NPs (Cit-Ag NPs) and of Hg ion in melamine-Ag NPs (MA-Ag NPs) cause Ag NPs aggregation, and are accompanied by a color change and a red-shift. The resulting distinctly visual readouts are favorable for colorimetric detection of Cr and Hg ions. Under optimal conditions, the linear ranges are observed in the concentration ranges of 1.0-50.0 and of 10.0-100.0 μM, and with detection limit of 0.52 and 1.80 μM for Cr and Hg ions. The simultaneous detection of Cr and Hg ion is driven by the changing the ligand chemistry on the surfaces of Ag NPs that allows to tune their specific interactions with target analytes. Finally, the functionalized Ag NPs were successfully applied to detect Cr and Hg ions in water samples with satisfactory recoveries.
在本工作中，我们描述了银纳米颗粒（Ag NPs）表面配体化学在调节其分析应用方面的作用。柠檬酸盐和三聚氰胺（MA）分子用作Ag NPs表面修饰的配体。在柠檬酸盐-Ag NPs（Cit-Ag NPs）中添加Cr离子以及在三聚氰胺-Ag NPs（MA-Ag NPs）中添加Hg离子会导致Ag NPs聚集，并伴随颜色变化和红移。由此产生的明显视觉读数有利于Cr和Hg离子的比色检测。在最佳条件下，Cr和Hg离子的线性范围分别在1.0 - 50.0和10.0 - 100.0 μM浓度范围内观察到，检测限分别为0.52和1.80 μM。通过改变Ag NPs表面的配体化学来驱动Cr和Hg离子的同时检测，这使得能够调节它们与目标分析物的特定相互作用。最后，功能化的Ag NPs成功应用于检测水样中的Cr和Hg离子，回收率令人满意。
