Yang Weilu, Liu Dong, Liu Yun, Yang Shichu, Liu Yadi, Shen Zhihao, Yang Huai, Fan Xing-He, Zhou Qi-Feng
Beijing National Laboratory for Molecular Sciences Key Laboratory of Polymer Chemistry and Physics of Ministry of Education Center for Soft Matter Science and Engineering and College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, P. R. China.
Key Laboratory of Polymer Chemistry and Physics of Ministry of Education and School of Materials Science and Engineering, Peking University, Beijing, 100871, P. R. China.
Chemistry. 2023 Mar 28;29(18):e202203702. doi: 10.1002/chem.202203702. Epub 2023 Feb 23.
Construction of sub-5 nm long-range ordered structures through self-assembly has received increasing attention. Herein, a series of ODMS-based thermotropic liquid crystals (LCs) containing perylene diimide (PDI) were designed and synthesized. These LCs can form ordered nanostructures with periodic sizes around 5 nm including smectic J (SmJ), oblique columnar (Col ), and hexagonal columnar (Col ) phases with change in the volume fraction of ODMS, where the layer spacing of the SmJ phase is less than 5 nm. Thin films with parallel oriented nanolines with line width less than 5 nm can be obtained on PDMS-modified silicon substrates by spin-casting and simple thermal annealing processes. Moreover, owing to the strong π-π interaction between PDI cores, these nanolines are long-range ordered with uniaxial orientation in relatively large areas (1.5×1.5 μm ) with over 300 continuous microdomains without pre-patterning. These nanostructures provide the possibility of preparing nanotemplates by oxygen plasma etching.
通过自组装构建长度小于5 nm的长程有序结构受到了越来越多的关注。在此，设计并合成了一系列基于ODMS的含有苝二亚胺（PDI）的热致液晶（LC）。这些液晶可以形成周期尺寸约为5 nm的有序纳米结构，包括近晶J（SmJ）相、斜方柱状（Col ）相和六方柱状（Col ）相，其结构会随着ODMS体积分数的变化而变化，其中SmJ相的层间距小于5 nm。通过旋涂和简单的热退火工艺，可以在PDMS修饰的硅衬底上获得具有线宽小于5 nm的平行取向纳米线的薄膜。此外，由于PDI核之间存在强π-π相互作用，这些纳米线在相对较大的区域（1.5×1.5 μm ）内具有长程有序的单轴取向，且有超过300个连续的微区，无需预先图案化。这些纳米结构为通过氧等离子体蚀刻制备纳米模板提供了可能性。
