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首页> 外文期刊>The Analyst: The Analytical Journal of the Royal Society of Chemistry: A Monthly International Publication Dealing with All Branches of Analytical Chemistry >An unusual red-to-brown colorimetric sensing method for ultrasensitive silver(I) ion detection based on a non-aggregation of hyperbranched polyethylenimine derivative stabilized gold nanoparticles
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An unusual red-to-brown colorimetric sensing method for ultrasensitive silver(I) ion detection based on a non-aggregation of hyperbranched polyethylenimine derivative stabilized gold nanoparticles

机译：基于超支化聚乙烯亚胺衍生物稳定的金纳米粒子非聚集的超灵敏银（I）离子检测的一种非常规的红棕色比色传感方法

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摘要

Here we have developed a facile and rapid colorimetric method for the sensitive and selective detection of Ag+ based on the non-aggregation of gold nanoparticles (Au NPs) capped with hyperbranched polyethylenimine derivatives. In the detection process, an unusual colour change from red to brown was observed due to the formation of Au-Ag core-shell nanoparticles, which was more sensitive than that of the usual colorimetric assays (red to blue) based on the aggregation of Au NPs. After the colour changed, the non-aggregation-based Au-Ag core-shell nanomaterials did not aggregate further and could remain stable for a long time, which was convenient to record, detect and observe. The sensing probe exhibited a drastically long observing time for detecting Ag+ owing to the stability of the Au-Ag core-shell non-aggregates, high sensitivity with a low detection limit of 8.76 nM by the naked eye and 1.09 nM by using a UV-vis spectrophotometer and a good linear relationship within the range from 1.09 to 109 nM. The colour change of the system is very fast, occurring within 1 to 2 minutes. Moreover, the proposed method also showed a remarkably high selectivity toward Ag+ and was successfully used in tap water and drinking water samples. Therefore, this unusual colorimetric assay based on the non-aggregation of Au NPs has a great potential as a simple, rapid, sensitive and selective detection method for the detection of Ag+.
机译：在这里，我们开发了一种简便而快速的比色法，用于以超支化聚乙烯亚胺衍生物覆盖的金纳米颗粒（Au NPs）的非聚集为基础，灵敏和选择性地检测Ag +。在检测过程中，由于形成了Au-Ag核壳纳米粒子，观察到了从红色到棕色的异常颜色变化，这比基于Au聚集的常规比色测定法（红色到蓝色）更敏感。 NP。颜色改变后，非团聚的Au-Ag核壳纳米材料不再团聚，可以长时间稳定，便于记录，检测和观察。由于Au-Ag核-壳非聚集体的稳定性，高灵敏度，肉眼可见的检测限低至8.76 nM，UV-UV的检测限低至1.09 nM，因此传感探针的Ag +探测时间非常长。可见分光光度计，在1.09至109 nM的范围内具有良好的线性关系。系统的颜色变化非常快，在1-2分钟内即可发生。此外，该方法还显示出对Ag +的极高选择性，并成功用于自来水和饮用水样品中。因此，这种基于Au NPs非聚集的异常比色法作为一种简单，快速，灵敏和选择性的检测Ag +的方法具有巨大的潜力。

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