Duan Hanyi, Luo Qiang, Wei Zichao, Lin Yao, He Jie
ACS Macro Lett. 2021 Jul 20;10(7):786-790. doi: 10.1021/acsmacrolett.1c00252. Epub 2021 Jun 9.
Symmetry-broken nanoparticles (NPs) are important building blocks with directional interparticle interaction as a key to access the precise organization of NPs macroscopically. We report a facile, one-pot synthetic approach to prepare high-quality symmetry-broken plasmonic gold NPs (AuNPs). Symmetry-broken patterning is achieved through deficient ligand exchange of isotropic AuNPs with thiol-terminated polystyrene (PS-SH) in the presence of an amphiphilic polymer surfactant. The concentration of PS-SH plays a dominant role in tuning surface patterning and coverage of AuNPs. The formation of asymmetric surface patches arises from the interplay between the conformational entropy of polymer ligands and the interfacial energy between polymer-grafted AuNPs and the solvent. Our method illustrates new paradises to design asymmetric NPs with directional interparticle interactions to access the precise organization of NPs.
对称性破缺的纳米粒子（NPs）是重要的构建块，其粒子间的定向相互作用是宏观上实现纳米粒子精确组织的关键。我们报道了一种简便的一锅法合成方法来制备高质量的对称性破缺的等离子体金纳米粒子（AuNPs）。在两亲性聚合物表面活性剂存在的情况下，通过各向同性的AuNPs与硫醇封端的聚苯乙烯（PS-SH）进行不足的配体交换来实现对称性破缺图案化。PS-SH的浓度在调节AuNPs的表面图案化和覆盖率方面起主导作用。不对称表面斑块的形成源于聚合物配体的构象熵与聚合物接枝的AuNPs和溶剂之间的界面能之间的相互作用。我们的方法为设计具有定向粒子间相互作用的不对称纳米粒子以实现纳米粒子的精确组织提供了新途径。
