Self-assembly of colloidal nanocrystals (NCs) into large-scale superlattices with complex and controllable structures has attracted extensive attention due to their collective properties and promising device applications. Plasmonic NCs are very popular for long-range ordered superstructures by virtue of their collective nanogaps for electromagnetic field enhancement, in particular bulk-scale single-layer assembly. Large-area two-dimensional (2D) quasinanosheets (QNSs) composed of mono-component Au NCs or multi-component Au@ZnS core-shell hetero-nanocrystals (HNCs) were successfully prepared, via careful solvent evaporation-induced interfacial self-assembly. The entire self-assembly process was carried out on the liquid-air surface and mediated simply by tuning the operating temperatures and concentrations of the NCs. Specifically, monolayer and double-layer 2D QNSs in tens of micrometers scale with different stacking models were fabricated by precisely controlling the solvent evaporation rate and colloidal concentration.

胶体纳米晶体（NCs）的自组装成具有复杂且可控结构的大规模超晶格，由于它们的集体性质和有希望的器件应用而受到了广泛的关注。等离子NC由于其集体的纳米间隙可增强电磁场，特别是用于大规模单层组装，因此对于远程有序超结构非常受欢迎。成功地制备了由单组分Au NCs或多组分Au @ ZnS核壳杂纳米晶体（HNCs）组成的大面积二维（2D）拟纳米片（QNS）。小心溶剂蒸发引起的界面自组装。整个自组装过程在液气表面上进行，只需调节NC的工作温度和浓度即可对其进行调节。具体而言，通过精确控制溶剂的蒸发速率和胶体浓度，可制得数十微米规模，具有不同堆叠模型的单层和双层二维QNS。