writer：Xuejie Liu, Xuan Yue, Nan Yan, Wei Jiang
keywords：金纳米粒子, 三维超晶格, 乳液界面不稳定性, 自组装, 等离激元
source：期刊
specific source：Materials Chemistry Frontiers, 2021, 5(19), 7306-7314
Issue time：2021年

摘要：由功能无机纳米粒子（NPs）自组装而成的三维（3D）超晶格材料，因其构筑单元的独特性质以及相邻NPs相互作用产生的额外有趣集体性质而受到广泛关注。然而，无机NPs自发组装成3D独立等离激元超晶格仍是巨大挑战。本文报道了一种简便而通用的策略，通过系统调控油/水界面张力和乳液液滴界面不稳定性，将接枝聚苯乙烯（PS）和聚2-乙烯基吡啶（P2VP）均聚物的金纳米粒子（AuNPs）组装成3D独立片状超晶格。制备的片状超晶格为多层结构，AuNP构筑单元以四面体方式堆叠，每个AuNP部分坐落于另外三个邻近纳米粒子上。此外，通过改变AuNPs表面接枝PS配体的分子量，可有效调控相邻NP间粒子间距。这种无模板方法为将纳米粒子操控成独立有序3D超晶格提供了新颖有效的途径，具有广泛潜在应用。

Abstract：Three-dimensional (3D) superlattice materials self-assembled from functional inorganic nanoparticles (NPs) have attracted extensive attention due to the unique properties of the building blocks and additional intriguing collective properties derived from the interaction between adjacent NPs. However, the spontaneous assembly of inorganic NPs into 3D free-standing plasmonic superlattices still remains an enormous challenge. Herein, we report a facile and universal strategy to assemble gold nanoparticles (AuNPs) tethered with polystyrene (PS) and poly(2-vinylpyridine) (P2VP) homopolymers into 3D free-standing sheet-like superlattices by systematically tuning the oil/water interfacial tension and the interfacial instability of emulsion droplets. The prepared sheet-like superlattices are multilayer and the AuNP building blocks stack as tetrahedra, in which each AuNP building block is partially sitting on the three other nearby nanoparticles. Moreover, the interparticle distance between adjacent NPs can be effectively regulated by varying the molecular weight of the tethered PS ligands on the surface of AuNPs. This template-free approach provides a novel and effective route to manipulate nanoparticles into free-standing ordered 3D superlattices with a wide range of potential applications.

论文链接：https://doi.org/10.1039/d1qm00804h