Uniform exciton fluorescence from individual molecular nanotubes immobilized on solid substrates
Uniform exciton fluorescence from individual molecular nanotubes immobilized on solid substrates
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DOI：
10.1038/nnano.2009.227
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发表时间：
2009-10-01
影响因子：
38.3
通讯作者：
Vanden Bout, David A.
中科院分区：
文献类型：
--
作者：
Eisele, Doerthe M.;Knoester, Jasper;Vanden Bout, David A.
π共轭分子（1- 1 - 5）的自组装准一维纳米结构由于其有趣的光电性质可以在器件中找到用途，所述光电性质包括尖锐的激子跃迁（1-5）、强圆二色性（5-7）、高激子迁移率（8，9）和光电导性（10）。然而，许多应用需要将这些纳米结构固定在固体基底上，这是一个挑战，以实现而不破坏其微妙的超分子结构。在这里，我们使用液滴流技术，双壁管状J-聚集体的两亲性菁染料，而不影响其形态或光学性质。高分辨率图像的拓扑结构和激子荧光的个人J-聚集体同时获得偏振分辨近场扫描光学显微镜。这些图像显示出非常均匀的超分子结构，无论是沿着单个纳米管还是在一个整体中的纳米管之间，都展示了它们在光捕获和能量传输方面的潜力。
Self-assembled quasi one-dimensional nanostructures of pi-conjugated molecules(1-15) may find a use in devices owing to their intriguing optoelectronic properties, which include sharp exciton transitions(1-5), strong circular dichroism(5-7) high exciton mobilities(8,9) and photoconductivity(10). However, many applications require immobilization of these nanostructures on a solid substrate, which is a challenge to achieve without destroying their delicate supramolecular structure. Here, we use a drop-flow technique to immobilize double-walled tubular J-aggregates of amphiphilic cyanine dyes without affecting their morphological or optical properties. High-resolution images of the topography and exciton fluorescence of individual J-aggregates are obtained simultaneously with polarization-resolved near-field scanning optical microscopy. These images show remarkably uniform supramolecular structure, both along individual nanotubes and between nanotubes in an ensemble, demonstrating their potential for light harvesting and energy transport.