Symmetry-Broken Patches on Gold Nanoparticles through Deficient Ligand Exchange
Symmetry-Broken Patches on Gold Nanoparticles through Deficient Ligand Exchange
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DOI：
10.1021/acsmacrolett.1c00252
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发表时间：
2021-06-09
影响因子：
7.015
通讯作者：
He, Jie
中科院分区：
文献类型：
--
作者：
Duan, Hanyi;Luo, Qiang;He, Jie
对称破缺纳米粒子（NPs）是研究粒子间定向相互作用的重要组成部分，是研究纳米粒子微观结构的关键。我们报道了一种简单的一锅合成方法来制备高质量的对称破碎等离子体金NPs （AuNPs）。在两亲性聚合物表面活性剂的存在下，通过与巯基端聚苯乙烯（PS-SH）交换各向同性AuNPs的配体缺陷来实现对称破缺图型。PS-SH的浓度在调节表面图案和AuNPs的覆盖中起主导作用。不对称表面斑块的形成是由聚合物配体的构象熵和聚合物接枝的AuNPs与溶剂之间的界面能相互作用引起的。我们的方法为设计具有定向粒子间相互作用的非对称NPs以获得NPs的精确组织提供了新的天堂。
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.