Forming Long-range Order of Semiconducting Polymers through Liquid-phase Directional Molecular Assemblies
Macromolecules(2024)
摘要
Intermolecular interactions are crucial in determining the morphology of
solution-processed semiconducting polymer thin films. However, these random
interactions often lead to disordered or short-range ordered structures.
Achieving long-range order in these films has been a challenge due to limited
control over microscopic interactions in current techniques. Here, we present a
molecular-level methodology that leverages spatial matching of intermolecular
dynamics among solutes, solvents, and substrates to induce directional
molecular assembly in weakly bonded polymers. Within the optimized dynamic
scale of 2.5 Å between polymer side chains and self-assembled monolayers
(SAMs) on nanogrooved substrates, our approach transforms random aggregates
into unidirectional fibers with a remarkable increase in the anisotropic
stacking ratio from 1 to 11. The Flory-Huggins-based molecular stacking model
accurately predicts the transitioning order on various SAMs, validated by
morphologic and spectroscopic observations. The enhanced structural ordering
spans over 3 orders of magnitude in length, raising from the smallest 7.3 nm
random crystallites to >14 um unidirectional fibers on sub-millimeter areas.
Overall, this study provides insights into the control of complex
intermolecular interactions and offers enhanced molecular-level controllability
in solution-based processes.
更多查看译文
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要