Controlling patterns by geometry in block copolymer thin films

通过嵌段共聚物薄膜中的几何形状控制图案

• 批准号: 248882694
• 负责人: Professorin Dr. Friederike Schmid
• 金额: --
• 依托单位: Institut für Physik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/248882694?language=en
• 关键词: Controlling; patterns; geometry; block; copolymer

Self-assembling block copolymers provide a powerful framework for producing nanopatterns for a diversity of applications, including nanoporous membranes for ultra-purification, solar cells, nanotemplates, organic optoelectronics, and UV polarizers, and many others. However, one frequent problem with the self-assembly approach is lack of long-range order due to pattern undulations and defects. Numerous methods to produce patterns with well-defined orientational order have been proposed, such as shear alignment, alignment through electric fields, zone and solvent annealing, or grapho- and chemo-epitaxy. Here, we explore another possible aligning factor, the geometry in which the block copolymer film system is embedded. In the previous funding period, we have demonstrated that geometry can be an effective guiding field to induce long-range order and to prescribe the distribution and density of topological defects. In this project, we propose to study the equilibrium and kinetic properties of self-assembling block copolymer thin films deposited onto curved substrates. The central challenge is to develop a meaningful theory that allows identifying the leading parameters that control the intrinsic order in curved films carrying self-assembled patterns. The proposed study involves the treatment of ordering and defect dynamics on a wide range of length and time scales, spanning from molecular scales up to those that govern the mesoscopic kinetics of ordering under the action of experimentally accessible geometric fields. Special attention will be paid to the coupling between pattern morphologies and local symmetry and geometry. These problems will be tackled by a combined experimental and simulation effort.

自组装嵌段共聚物为生产用于多种应用的纳米粒子提供了强大的框架，包括用于超纯化的纳米多孔膜、太阳能电池、纳米模板、有机光电子和UV偏振器以及许多其他应用。然而，自组装方法的一个常见问题是由于图案起伏和缺陷而缺乏长程有序。已经提出了许多方法来产生具有明确定义的取向顺序的图案，例如剪切对准、通过电场对准、区域和溶剂退火、或石墨外延和化学外延。在这里，我们探索另一种可能的对齐因素，嵌段共聚物膜系统嵌入的几何形状。在上一个资助期内，我们已经证明了几何形状可以是一个有效的引导场，以诱导长程有序，并规定拓扑缺陷的分布和密度。 在本计画中，我们将研究沉积在曲面基材上的自组装嵌段共聚物薄膜的平衡与动力学性质。中心的挑战是开发一个有意义的理论，允许识别的主导参数，控制的内在秩序在弯曲的薄膜进行自组装图案。拟议的研究涉及的治疗范围广泛的长度和时间尺度上的有序和缺陷动力学，从分子尺度到那些管理的介观动力学的有序实验访问的几何场的作用下。将特别注意图案形态和局部对称性和几何形状之间的耦合。这些问题将通过实验和模拟相结合的努力来解决。