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首页> 外文期刊>RSC Advances >Silver/gold core/shell nanowire monolayer on a QCM microsensor for enhanced mercury detection
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Silver/gold core/shell nanowire monolayer on a QCM microsensor for enhanced mercury detection

机译：QCM微传感器上的银/金核/壳纳米线单层，用于增强汞检测

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摘要

The formation of a silver nanowire monolayer (Ag NWML) galvanically replaced with gold (Au) directly on the electrodes of a quartz crystal microbalance (QCM) transducer for non-spectroscopic based elemental mercury (Hg-0) vapor sensing is reported in this study. The modification of Ag NWML to Ag/Au alloyed (Ag/Au NWML) structures through galvanic replacement (GR) reaction was found to enhance the sensitivity and selectivity of the sensors. Following GR reaction, the morphology of the Ag nanowires was found to change without deforming the monolayer packing arrangement. Interestingly, the selectivity of the sensor toward Hg-0 vapor was increased by increasing the Au concentration during the GR reaction. The Ag/Au NWML based sensor which was modified using a 2 mM Au solution was found to produce 3 times higher sensitivity compared to the Au control QCM as well as having more than 95% accuracy and >90% repeatability. This was found to be due to the formation of Ag/Au alloys (Ag/Au NWML) with active sites that had a high affinity toward Hg0 vapor.
机译：本研究报告了在非光谱基元素汞（Hg-0）蒸气感测的石英晶体微量天平（QCM）传感器的电极上直接用金（Au）电镀取代的银纳米线单层（Ag NWML）的形成。 。发现通过电流置换（GR）反应将Ag NWML修饰为Ag / Au合金化（Ag / Au NWML）结构可增强传感器的灵敏度和选择性。 GR反应后，发现Ag纳米线的形态发生了变化，而不会使单层堆积结构变形。有趣的是，通过在GR反应过程中增加Au的浓度，可以提高传感器对Hg-0蒸气的选择性。发现使用2 mM Au溶液修饰的基于Ag / Au NWML的传感器产生的灵敏度是Au对照QCM的3倍，并且具有超过95％的准确度和> 90％的可重复性。发现这是由于形成了具有对Hg0蒸气具有高亲和力的活性部位的Ag / Au合金（Ag / Au NWML）。

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