Institut für Physikalische Chemie der Johannes-Gutenberg-Universität Mainz Welderweg 11, 55099 Mainz, Germany.
Langmuir. 2010 Dec 7;26(23):17981-8. doi: 10.1021/la103415e. Epub 2010 Nov 9.
We prepared silica-dye-nanocrystal hybrid particles and studied the energy transfer from semiconductor nanocrystals (= donor) to organic dye molecules (= acceptor). Multishell CdSe/CdS/ZnS semiconductor nanocrystals were adsorbed onto monodisperse Stöber silica particles with an outer silica shell of thickness 2-23 nm containing organic dye molecules (Texas Red). The thickness of this dye layer has a strong effect on the energy transfer efficiency, which is explained by the increase in the number of dye molecules homogeneously distributed within the silica shell, in combination with an enhanced surface adsorption of nanocrystals with increasing dye amount. Our conclusions were underlined by comparison of the experimental results with numerically calculated FRET efficiencies and by control experiments confirming attractive interaction between the nanocrystals and Texas Red freely dissolved in solution.
我们制备了二氧化硅-染料-纳米晶杂化粒子，并研究了半导体纳米晶（=供体）向有机染料分子（=受体）的能量转移。多壳层 CdSe/CdS/ZnS 半导体纳米晶被吸附到具有 2-23nm 厚的单分散 Stöber 二氧化硅颗粒上，该颗粒的外二氧化硅壳层中含有有机染料分子（Texas Red）。该染料层的厚度对能量转移效率有很强的影响，这可以通过均匀分布在二氧化硅壳层内的染料分子数量的增加来解释，同时随着染料量的增加，纳米晶的表面吸附也得到增强。我们的结论通过与数值计算的 FRET 效率的实验结果进行比较以及通过控制实验得到了证实，这些控制实验证实了纳米晶与自由溶解在溶液中的 Texas Red 之间存在吸引力相互作用。
