Hierarchic structure of cyanine dyes J-aggregate in polymer microdomes
Hierarchic structure of cyanine dyes J-aggregate in polymer microdomes
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DOI：
10.1295/koron.60.752
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发表时间：
2003-01-01
影响因子：
--
通讯作者：
Nakajima, K
中科院分区：
文献类型：
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作者：
Kaga, K;Okamoto, K;Nakajima, K
研究了菁染料在云母基底上的聚苯乙烯微滴或圆顶中的分级结构和荧光行为。在将稀聚苯乙烯/染料溶液浇铸在基底和玻璃辊之间的空间中之后，通过移动连接到数字马达的玻璃辊来制备样品。去湿过程导致在二维排列的小聚合物圆顶中形成花青染料J-聚集体，其直径为1，类似于100 gm，高度为20 nm至几μ m。荧光显微照片显示，在一定的染料浓度下，在圆顶周围形成染料聚集体。这意味着染料从分子水平到微观层次的聚集体结构都是通过自组织形成的。J-聚集体的荧光光谱随浓度的增加而红移。通过对不同圆顶的比较，观察到了荧光光谱的尺寸效应。
The hierarchic structure and fluorescence behavior of cyanine dyes in mum-sized polystyrene droplets or domes on mica substrate were investigated. The samples were prepared by moving a glass roller connected to a digital motor after casting a dilute polystyrene/dyes solution in the space between substrate and glass roller. A de-wetting process leads to the formation of cyanine dye J-aggregates in small polymer domes arrayed in two dimensions with a diameter of 1 similar to 100 gm and a height of 20 nm to several mum. Fluorescence micrographs show that dye aggregates formed in the surroundings of the domes at a certain dye concentration. This means that the dye aggregate structure from the molecular level to the micro fevel is formed by self-organization. The fluorescence spectra of J-aggregate showed a red-shift with increasing concentration. By comparison of different domes, a size effect of the fluorescence spectra was observed.