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Surface-plasmon-based colorimetric detection of Cu(II) ions using label-free gold nanoparticles in aqueous thiosulfate systems

机译:在硫代硫酸盐水溶液中使用无标记的金纳米粒子,基于表面等离子体的比色法检测Cu(II)离子

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摘要

We report colorimetric, label-free and non-aggregation-based gold nanoparticle (AuNP) probes for the highly selective detection of Cu(II) ions in aqueous environments. This detection scheme relies on the ability of Cu(II) ions to catalyze the leaching of gold at room temperature in the presence of thiosulfate species and ammonia. This simple and cost-effective probe provides rapid detection of Cu(II) ions at concentrations as low as 10ppm. A similar detection method using AuNPs in ammonia-free thiosulfate solution is also viable at moderate reaction temperature (50°C). The ammonia-free method also leads to marked damping and red-shifting of the surface plasmon resonance signal of the AuNP dispersion. The two methods clearly differ in the nature of the surface plasmon damping phenomenon, and their working mechanisms are plausibly explained based on the experimental investigations.
机译:我们报告比色,无标记和非聚集的金纳米粒子(AuNP)探针用于水性环境中的铜(II)离子的高度选择性检测。此检测方案依赖于在硫代硫酸盐类物质和氨气存在下,Cu(II)离子在室温下催化金浸出的能力。这种简单且经济高效的探针可快速检测低至10ppm浓度的Cu(II)离子。在无氨的硫代硫酸盐溶液中使用AuNPs的类似检测方法在中等反应温度(50°C)下也是可行的。不含氨的方法还导致AuNP分散体的表面等离振子共振信号明显衰减和红移。两种方法在表面等离振子阻尼现象的性质上明显不同,并且基于实验研究合理地解释了它们的工作机理。

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