文献类型：期刊文献

英文题名：Formation of Two-Dimensional Nanosheets with Controlled Structures via One-Step Assembly of Diblock Molecular Brushes

作者：Jia, Shiqing[1];Zhang, Yuxiang[1];Feng, Weisheng[1];Tao, Xinfeng[1];Feng, Chun[1];Xu, Binbin[1];Lin, Shaoliang[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai Key Lab Adv Polymer Mat, Key Lab Ultrafine Mat,Minist Educ, Shanghai 200237, Peoples R China

年份：2026

卷号：59

期号：7

起止页码：4176

外文期刊名：MACROMOLECULES

收录：;EI(收录号：20261620522576);WOS:【SCI-EXPANDED(收录号:WOS:001724599700001)】；

基金：The authors are thankful for financial support from National Science Foundation for Distinguished Young Scholars (52325308), National Natural Science Foundation of China (52273008 and 52473005), and Shanghai Rising-Star Program (23QA1402500).

语种：英文

外文关键词：Chain length - Chains - Ethylene - Geometry - Molecular dynamics - Morphology - Self assembly

摘要：Two-dimensional (2D) nanosheets have drawn considerable attention due to their ultrathin planar structure and large surface area, demonstrating great potential across diverse fields. However, achieving simultaneous control over both the nanosheet geometry and size remains a significant challenge. Herein, we report a facile one-step approach for creating 2D nanosheets with controlled morphologies and sizes using PEG-b-(PtBA-g-PAzoNF) diblock molecular brushes, which consist of a poly(ethylene glycol) (PEG) block, a poly(t-butyl acrylate) (PtBA) backbone, and poly(4-((4-((nonafluoroheptyl)oxy)phenyl)diazenyl)phenyl methacrylate) (PAzoNF) side chains. The morphological transformations from symmetric hexagonal to rectangular to square nanosheets can be achieved by tuning the PAzoNF length. With long side chains, solvophobic PtBA-g-PAzoNF chains adopt a rod-like geometry and self-assemble into a columnar hexagonal structure. Upon decreasing the side-chain length, the backbone is approximately coplanar with the side chains, enabling the formation of square and rectangular nanosheets. The packing behavior of copolymer molecules was investigated through molecular dynamics simulations to verify the underlying mechanisms driving these morphological transitions. Furthermore, precise size control over these 2D nanosheets was realized by adjusting the copolymer concentration. Our study not only demonstrates the importance of the side-chain length of molecular brushes in determining their self-assembly behavior but also offers an effective strategy for designing 2D nanostructures with decent controllability.