Distance-dependent fluorescence quenching on gold nanoparticles ensheathed with layer-by-layer assembled polyelectrolytes
Distance-dependent fluorescence quenching on gold nanoparticles ensheathed with layer-by-layer assembled polyelectrolytes
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DOI：
10.1021/nl052441s
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发表时间：
2006-03-01
期刊：
影响因子：
10.8
通讯作者：
Blanchard-Desce, M
中科院分区：
文献类型：
--
作者：
Schneider, G;Decher, G;Blanchard-Desce, M
我们报告的制备，表征，和电子物理研究的新的荧光核/壳纳米粒子制造的静电层层组装。基于具有13 nm的直径的金核心，这些纳米胶体具有不同的荧光标记的聚合物电晕层，在不同的距离从使用非荧光聚电解质作为间隔层的核心金属的表面。紫外-可见光谱和透射电子显微镜证实，荧光标记的核/壳纳米颗粒的颗粒悬浮液在其构建的所有阶段都是稳定的。光物理研究表明，这些粒子系统中的荧光猝灭强烈依赖于距离。在用氰化钾温和溶解金芯后，可以精确地评估金属芯对这种淬火的贡献。光物理测量清楚地表明，金纳米粒子降低了辐射跃迁的跃迁几率。
We report on the preparation, characterization, and photophysical study of new fluorescent core/shell nanoparticles fabricated by electrostatic layer-by-layer assembly. On the basis of gold cores with a diameter of 13 nm, these nanocolloids possess different fluorescently labeled polymer corona layers at various distances from the surface of the core metal using nonfluorescent polyelectrolytes as spacer layers. UV-visible spectroscopy and transmission electron microscopy confirm that the particle suspensions of fluorescently labeled core/shell nanoparticles are stable at all stages of their construction. Photophysical investigations reveal strongly distance-dependent fluorescence quenching in these particle systems. The contribution of the metal core to this quenching can be assesed precisely after the gentle dissolution of the gold cores by potassium cyanide. The photophysical measurements reveal clearly that the gold nanoparticles decrease the transition probability for radiative transitions.