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首页> 美国卫生研究院文献>Molecules >Highly Sensitive and Selective Colorimetric Sensor of Mercury (II) Based on Layer–by–Layer Deposition of Gold/Silver Bimetallic Nanoparticles
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Highly Sensitive and Selective Colorimetric Sensor of Mercury (II) Based on Layer–by–Layer Deposition of Gold/Silver Bimetallic Nanoparticles

机译：基于金/银双金属纳米粒子的层逐层沉积高度敏感和选择性的比色传感器

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摘要

A new colorimetric sensor based on gold/silver bimetallic nanoparticles (Au–Ag BNPs) for the sensitive and selective detection of mercury (II) was developed. Gold nanoparticles (AuNPs) were synthesized by Turkevich method. The surface modification of AuNPs was modified by the layer–by–layer technique using poly(diallyl dimethylammonium chloride) which provided positively charged of AuNPs. Negatively charged silver nanoparticles (AgNPs) were synthesized by chemical reduction using poly(4–styrenesulfonic acid–co–maleic acid) as the stabilizing agent. The layer–by–layer assembly deposition technique was used to prepare Au–Ag BNPs of positively and negatively charged of AuNPs and AgNPs, respectively. The synthesized Au–Ag BNPs were characterized by a UV-visible spectrophotometer, zeta potential analyzer, FT–IR, TEM, XRD, and EDX. The Au–Ag BNPs sensor was able to detect mercury (II) in aqueous solution, visibly changing from brownish–orange to purple. The linear relationships of the UV-visible spectrometry demonstrate that the Au–Ag BNPs-based colorimetric sensor can be used for the quantitative analysis of mercury (II) in the range of 0.5–80 mg L−1, with the correlation coefficient, r2 = 0.9818. The limit of detection (LOD) of mercury (II) was found to be 0.526 + 0.001 mg L−1. The BNPs is also verified to have a good practical applicability for mercury (II) detection in the real samples.
机译：开发了一种基于Gold / Silver Bimetallic纳米颗粒（Au-AG BNPs）的新的比色传感器，用于敏感和选择性检测汞（II）。通过TureTevich方法合成金纳米颗粒（AUNP）。通过使用聚（二甲基二甲基氯化铵）的层逐层技术改性AuNP的表面改性，该方法提供正电荷的AUNP。通过使用聚（4-苯乙烯磺酸 - 共马来酸）作为稳定剂，通过化学降低合成带负电的银纳米颗粒（AgNP）。逐层组装沉积技术分别用于分别用于制备正极和抗AUNP和AGNP的正面和带负电荷的Au-Ag BNP。合成的AU-AG BNP通过UV可见分光光度计，Zeta电位分析仪，FT-IR，TEM，XRD和EDX。 AU-AG BNPS传感器能够检测水溶液中的汞（II），可见地从棕橙色到紫色。 UV可见光光谱法的线性关系表明，基于AU-AG BNP的比色传感器可用于汞（II）的定量分析，其范围为0.5-80mg L-1，具有相关系数，R2 = 0.9818。发现汞（II）的检测极限（II）为0.526 + 0.001mg L-1。还验证了BNP，以对真实样品中的汞（II）检测具有良好的实际适用性。

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