Laboratory for Functional Polymers, Swiss Federal Laboratories for Materials Science and Technology (Empa), Überlandstrasse 129, CH-8600 Dübendorf, Switzerland.
Nanoscale. 2019 Apr 4;11(14):6929-6938. doi: 10.1039/c8nr10357g.
Supramolecular assemblies with controlled morphology are of paramount importance for energy transport in organic semiconductors. Despite considerable freedom in molecular design, the preparation of dyes that form one dimensional J-aggregates is challenging. Here, we demonstrate a simple and effective route to functionalize dendronized polymers (DPs) with J-aggregates to construct tubular DP/J-aggregate nanowires. When J-aggregates are adsorbed onto DPs anchored to glass substrates, they assemble into microcrystalline domains typical for J-aggregates adsorbed on functionalized surfaces. Differently, the complexation between the dendronized polymer and J-aggregates in solution leads to dense packing of J-aggregate strands on the periphery of the DPs. Using a layer-by-layer (LBL) technique, DPs loaded with J-aggregates can also be adsorbed onto a DP monolayer. In this case, the thin film absorption spectra are narrower and indicate higher ratios of J-aggregate to monomer and dimer absorption than bare J-aggregates deposited similarly. The demonstration of J-aggregate adsorption on filamentous polymeric templates is a promising step toward artificial 1D light harvesting antennas, with potential applications in opto-electronic devices.
具有可控形态的超分子组装对于有机半导体中的能量传递至关重要。尽管在分子设计方面有相当大的自由度，但制备形成一维 J 聚集体的染料仍然具有挑战性。在这里，我们展示了一种简单而有效的方法，即用 J 聚集体功能化树枝状聚合物（DPs），以构建管状 DP/J- 聚集体纳米线。当 J 聚集体吸附到固定在玻璃基底上的 DPs 上时，它们会组装成典型的 J 聚集体在功能化表面上吸附的微晶畴。不同的是，树枝状聚合物与溶液中的 J 聚集体之间的络合导致 J 聚集体链在 DPs 外围的紧密堆积。使用层层（LBL）技术，负载 J 聚集体的 DPs 也可以吸附到 DP 单层上。在这种情况下，薄膜吸收光谱更窄，并表明 J 聚集体与单体和二聚体吸收的比例高于以类似方式沉积的裸露 J 聚集体。在丝状聚合物模板上吸附 J 聚集体的演示是朝着人工一维光收集天线迈出的有前途的一步，在光电设备中有潜在的应用。
