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首页> 外文期刊>Chemistry: A European journal >Silica nanoparticles for fluorescence sensing of Zn-II: Exploring the covalent strategy
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Silica nanoparticles for fluorescence sensing of Zn-II: Exploring the covalent strategy

机译：用于Zn-II荧光传感的二氧化硅纳米颗粒：探索共价策略

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摘要

Silica nanoparticles (about 15 nm diameters), which contain a derivative of 6-methoxy-8-(p-toluensulfonamido)-quinoline (TSQ) as a Zn-II fluorescent probe covalently linked to the silica network, were prepared and studied as Zn-II fluorescent chemosensors. The systems selectively detect Zn-II ions in water rich solutions with a submicromolar sensitivity: 0.13 mu M concentrations of Zn-II can be measured with the only interference of Cull and Cd-II ions. Compared with free TSQ, the nanoparticles based systems have the advant-age that they can be employed in aqueous solutions without aggregation problems while at the same time, they maintain a similar Zn-II affinity and sensing ability. Addition of a second, substrate insensitive, fluorophore to the particles leads to the realization of a ratiometric sensor.
机译：制备了二氧化硅纳米颗粒（直径约15 nm），该纳米颗粒包含与二氧化硅网络共价连接的6-甲氧基-8-（对甲苯磺酰胺基）-喹啉（TSQ）作为Zn-II荧光探针，并进行了研究-II荧光化学传感器。该系统以亚微摩尔灵敏度选择性地检测富水溶液中的Zn-II离子：在Cull和Cd-II离子的唯一干扰下，可以测量0.13μM的Zn-II浓度。与游离TSQ相比，基于纳米颗粒的系统具有可在水溶液中使用而无聚集问题的优势，同时，它们还具有相似的Zn-II亲和力和感测能力。向颗粒中添加第二种对基质不敏感的荧光团可实现比例传感器。

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