Colloidal nanocrystals (NCS) have excellent properties and broad application prospects. It is an important research direction to form large area superlattices with complex and controllable structure from bottom to top. The controllable gap between the plasma nanocrystals is beneficial to the enhancement of the electric field, so it is often used as an assembly unit to build long-range ordered large-area super structure, especially the large-scale assembly of single-layer nanocrystals.
Recently, Professor Zhang Jiatao and others from Beijing University of science and technology published research papers on Science China materials. Using solvent evaporation induced gas-liquid interface self-assembly process, a large area two-dimensional quasi nano sheet (QNS) was successfully obtained by self-assembly of single component Au nanocrystals and multi-component Au @ ZnS core-shell heterogeneous nanocrystals (HNCS). The whole self-assembly process is carried out on the gas-liquid interface, and the self-assembly process is regulated by changing the ambient temperature and the concentration of colloidal nanocrystalline solution. That is to say, by precisely controlling the evaporation rate of the solvent and the concentration of colloidal nanocrystalline, large-area two-dimensional quasi nano films with different layers and different stacking modes can be obtained.
Fig. 1 Schematic diagram of a large area two-dimensional quasi nano sheet (QNS) formed by solvent evaporation induced gas-liquid interface self-assembly process.
Fig. 2 different stacking patterns of two-dimensional quasi nano films.
The research results were recently published in Science China materials, 2020, 10.1007/s40843-020-1295-3.
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