Max-Planck-Institute of Colloids and Interfaces, Colloid Chemistry, Research Campus Golm, D-14424 Potsdam, Germany.
J Am Chem Soc. 2010 Mar 24;132(11):3700-7. doi: 10.1021/ja906667x.
The principle of polymer-controlled crystallization of inorganic materials has been successfully transferred to functional aromatic organic dyes, in this instance 3,4,9,10-perylenetetracarboxylic acid potassium salt (PTCAPS), after its single-crystal structure was determined. The cationic double hydrophilic block copolymer poly(ethylene glycol)-block-branched-poly(ethyleneimine) (PEG-b-PEI) was used as the polymer additive to modify the crystallization of PTCAPS. Ultralong hierarchically structured PTCAPS microbelts with constant width and thickness of each individual belt have been fabricated. The belts are a mesocrystalline assembly of primary nanoparticles with high-energy anionic {001} faces stabilized by polymer complexation. Polarization microscopy, X-ray diffraction, optical absorption spectra, and fluorescence spectra indicate the favorable orientation of the 1D microbelts in the close-stacking direction and reveal a specific 1D superstructure fluorescence. Electrical conductivity measurements performed on a single nanobelt disclose in the doped state a remarkably high electronic conductivity and further demonstrate extended, wirelike pi-pi interactions along the [020] long axis of the belts. Together with the very large length of the belts and their organic-organic hybrid nanostructure, this makes these organic wires potentially interesting for the field of nano-/micro-optoelectronics.
无机材料的聚合物控制结晶原理在确定其单晶结构后，已成功转移到功能芳香有机染料，即 3,4,9,10-苝四羧酸二钾盐（PTCAPS）。阳离子型双亲嵌段共聚物聚乙二醇-支化聚亚胺（PEG-b-PEI）被用作聚合物添加剂来修饰 PTCAPS 的结晶。制备了具有恒定宽度和厚度的各向异性超结构 PTCAPS 微带。这些微带是由初级纳米粒子组成的介晶组装体，其具有高能量阴离子{001}面，由聚合物络合稳定。偏光显微镜、X 射线衍射、光吸收光谱和荧光光谱表明一维微带在紧密堆积方向上具有良好的取向，并显示出特定的一维超结构荧光。在单个纳米带上进行的电导率测量表明，在掺杂状态下，电子电导率非常高，并且进一步证明了沿着微带的[020]长轴的扩展的线状π-π相互作用。这些微带具有非常大的长度和有机-有机混合纳米结构，这使得这些有机线在纳米/微光电领域具有潜在的应用前景。
