作者：Xin Yu, Jinlan Li, Nan Yan, Wei Jiang
关键字：金纳米粒子, 季铵化, 超晶格, 乳液液滴, 界面不稳定性
论文来源：期刊
具体来源：The Journal of Physical Chemistry C, 2023, 127(21), 10253-10260
发表时间：2023年

摘要：功能无机纳米粒子（NPs）的可编程组织因强等离激元耦合效应带来的增强磁、电和光学性质而受到广泛关注。然而，无机NPs自发自组装成具有所需或可调形状的均匀超晶格仍是巨大挑战。本文报道了接枝聚苯乙烯（PS）和季铵化聚2-乙烯基吡啶（P2VP）配体的金纳米粒子（AuNPs）在乳液液滴中季铵化辅助分级组装成可控超结构。溴代烷基分子添加剂（如CnH2n+1Br）与P2VP配体的季铵化相互作用导致季铵化P2VP配体亲水性增加，并触发乳液液滴界面不稳定性，实现所生成超结构从实心组装体到中空胶体体再到多层片状超晶格的连续转变。此外，可通过添加剂加入量和烷基链长度方便调控季铵化程度，为制备可控超结构和功能材料提供了独特而有前景的方法。

Abstract：Programmable organization of functional inorganic nanoparticles (NPs) into well-defined hierarchical superstructures has raised considerable concern due to the enhanced magnetic, electronic, and optical properties arising from the strong plasmonic coupling effect. However, the spontaneous self-assembly of inorganic NPs into uniform superlattices with the desired or tunable shape remains a formidable challenge. Herein, we report the quaternization-assisted hierarchical assembly of gold nanoparticles (AuNPs) tethered with polystyrene (PS) and quaternized poly(2-vinylpyridine) (P2VP) ligands into controllable superstructures in emulsion droplets. The quaternization interaction between bromoalkyl molecular additives (e.g., CnH2n+1Br) and P2VP ligands results in the increase of the hydrophilicity degree of quaternized P2VP ligands and triggers the interfacial instability of emulsion droplets, achieving the continuous transformation of generated superstructures from solid assemblies to hollow colloidosomes and then to the multilayer sheet-like superlattices. Furthermore, the degree of quaternization can be readily tuned by the added content of additives and the length of the alkyl chain, providing a unique and promising approach to prepare controllable superstructures and functional materials.

论文链接：https://doi.org/10.1021/acs.jpcc.3c01826