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Selective and sensitive colorimetric determination of cobalt ions using Ag–Au bimetallic nanoparticles

机译：Ag-Au双金属纳米颗粒对钴离子的选择性和灵敏比色测定

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Plasmonic nanoparticle-based colorimetric sensing has gained wide attention due to its advantages including rapidity, simplicity and expensive instrument-free characters. In the present study, Ag–Au bimetallic nanoparticles were proposed as novel optical probes to determine cobalt ion (Co2+) concentration. The sensing mechanism is based on the fact that Co2+ can react with ethylenediamine (en) and S2O32? to form (en)2CoS2O3+ on the nanoparticle surface, which can decrease the negative charge of the nanoparticle, reduce the repulsion between adjacent nanoparticles, and subsequently induce nanoparticle aggregation, was verified by dynamic light scattering. The effects of several parameters on the detection sensitivity, including the concentration of S2O32? and en, pH value and incubation time, were investigated. The assay demonstrated high selectivity toward Co2+ in the presence of K+, Cu2+, Pb2+, Ag+, Zn2+, Ba2+, Mn2+, Fe2+, Fe3+, Ni2+ and Hg2+. Under optimal conditions, the absorbance ratio of A600/A434 showed a linear relationship versus Co2+ concentration from 0 to 0.6 μM with a correlation coefficient (R2) of 0.980, and the detection limit was calculated to be 0.02 μM. The practical application of the proposed nanoprobes was evaluated with river and tap water samples.
机译：基于等离子纳米粒子的比色传感由于其优点包括快速，简单和昂贵的无仪器特征而受到了广泛的关注。在本研究中，提出了将Ag–Au双金属纳米颗粒用作测定钴离子（Co 2 + ）浓度的新型光学探针。感应机制基于以下事实：Co 2 + 可以与乙二胺（en）和S 2 反应O 3 2？ 形成（en） 2 CoS 2 O 3 + 通过动态光散射验证了可以减少纳米粒子的负电荷，减少相邻纳米粒子之间的排斥力并随后引起纳米粒子聚集的纳米粒子表面。 S 2 O 3 < sup> 2？ ，并进行en，pH值和孵育时间的研究。该分析表明在存在K + ，Cu + 的情况下，对Co 2 + 具有高选择性> 2 + ，Pb 2 + ，Ag + ，Zn 2 + ，Ba 2 + ，Mn 2 + ，Fe 2 + ，Fe 3 + ，Ni 2 + 和Hg 2 + 。在最佳条件下， A 600 / A 434 与 vs Co 2 + 浓度呈线性关系，浓度从0到0.6μM，具有相关系数（ R < / em> 2 ）为0.980，计算出的检出限为0.02μM。用河水和自来水样品对提出的纳米探针的实际应用进行了评估。

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