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首页> 外文期刊>Chemistry: A European journal >Multifold Fluorescence Enhancement in Nanoscopic Fluorophore-Clay Hybrids in Transparent Aqueous Media
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Multifold Fluorescence Enhancement in Nanoscopic Fluorophore-Clay Hybrids in Transparent Aqueous Media

机译：透明水介质中纳米荧光团-粘土杂化物的多重荧光增强

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摘要

Valuable emissive properties of organic fluorophores have become indispensable analytical tools in biophotonics, but frequently suffer from low solubilities and radiationless deactivation in aqueous media, that is, in biological ambience as well. In this report, nanoscaled dye-clay hybrids based on laponite, Na-0.7{(Li0.3Mg5.5)[Si8O20(OH)(4)]}, are taken advantage of to solubilize neutral dyes, which are natively not encountered in water. Previously reported efficiency and solubility bottlenecks of such hybrids can to a large extent be overcome by comparably simple chemical measures, as demonstrated here for two prominent examples, the fluorescent dyes Nile Red and Coumarin 153. On controlled co-adsorption of small bifunctional quaternary ammonium ions (Me3N+C2H5OH and Me3N+C2H5NH2) we observed an outright efficiency boost by an order of magnitude, and a 30-fold brightness gain. Even at higher concentrations, transparency and stability of the hybrid dispersions are retained, rendering them useful for employment as optically functional nanoparticles in bioassays and beyond.
机译：有机荧光团的宝贵发射特性已成为生物光子学中必不可少的分析工具，但经常遭受溶解度低和在水性介质（即在生物环境中）中无辐射失活的困扰。在此报告中，利用基于皂石钠（Na-0.7 {（Li0.3Mg5.5）[Si8O20（OH）（4）]}）的纳米级染料-粘土杂化剂来溶解中性染料，而中性染料本来就没有水。可以通过比较简单的化学方法在很大程度上克服先前报道的此类杂化剂的效率和溶解性瓶颈，如此处两个著名的例子（荧光染料Nile Red和香豆素153）所证明的那样。在控制下小双官能季铵离子的共吸附（Me3N + C2H5OH和Me3N + C2H5NH2），我们观察到效率得到了一个数量级的提升，亮度增益提高了30倍。即使在更高的浓度下，杂化分散体的透明度和稳定性也得以保留，这使其可用于生物测定及其他领域中用作光学功能纳米粒子。

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