Department of Chemistry, University of North Dakota, Grand Forks, ND 58202, USA.
Nanoscale. 2013 Oct 7;5(19):9365-73. doi: 10.1039/c3nr02500d. Epub 2013 Aug 19.
The effects that nanometer-sized matrices have on the properties of molecules encapsulated within the nanomatrix are not fully understood. In this work, dye-doped silica nanoparticles were employed as a model for studying the effects of a nanomatrix on the fluorescence quantum yield of encapsulated dye molecules. Two types of dye molecules were selected based on their different responses to the surrounding media. Several factors that affect fluorescence quantum yields were investigated, including aggregation of dye molecules, diffusion of atmospheric oxygen, concentration of dye molecules, and size of the nanomatrix. The results showed that the silica nanomatrix has a varied effect on the fluorescence quantum yield of encapsulated dye molecules, including enhancement, quenching and insignificant changes. Both the properties of dye molecules and the conditions of the nanomatrix played important roles in these effects. Finally, a physical model was proposed to explain the varied nanomatrix effects on the fluorescence quantum yield of encapsulated dye molecules.
纳米基质对包裹在其中的分子的性质的影响尚未完全了解。在这项工作中，我们采用染料掺杂二氧化硅纳米粒子作为模型，研究纳米基质对包裹染料分子荧光量子产率的影响。根据它们对周围介质的不同响应，选择了两种类型的染料分子。研究了影响荧光量子产率的几个因素，包括染料分子的聚集、大气氧的扩散、染料分子的浓度和纳米基质的大小。结果表明，二氧化硅纳米基质对包裹染料分子的荧光量子产率有不同的影响，包括增强、猝灭和无明显变化。染料分子的性质和纳米基质的条件都对这些影响起着重要作用。最后，提出了一个物理模型来解释纳米基质对包裹染料分子荧光量子产率的不同影响。
