Publication date: 15th December 2025
Semiconductor nanocrystals have attracted significant interest not only due to the bright emission of individual particles but also to the unique collective optical phenomena they exhibit when assembled into superlattices, such as miniband formation[1] and superfluorescence[2]. The collective properties of these superlattices are highly dependent on their overall configuration and scale[3]. However, the rigidity and polydispersity of conventional inorganic nanocrystals typically restrict superlattices to densely packed, micrometer-scale structures[4].
Magic-size nanomaterials—such as specific semiconductor nanoclusters[5] and nanoplatelets[6], possess atomically precise dimensions in at least one direction. We have employed these magic-size nanomaterials as building blocks for novel superstructures, taking advantages on their atomic-level uniformity and more compliant ligand shells.Series of superstructures with flexible configurations and macroscopic scales have been achieved: (1) One-Dimensional Superlattices with widths of 0.7–1 µm and lengths spanning 10–1500 µm. These structures exhibit near-unity polarized emission (anisotropy factor, P = 0.92), circularly polarized photoluminescence (dissymmetry factor, *g*PL = 0.11), and strong circularly polarized light emission (*g*CPL = 0.3); (2) Centimeter-scale macroscopic helicies with a diameter of ~0.9 cm and a height of ~2.0 cm. These helices display a clear hierarchical organization, progressing from nanoclusters (nm) to filaments (µm), then to ripples (mm), and finally to the complete helices (cm).
This work was supported by the National Natural Science Foundation of China (Nos. 52122308 and 22305224), the China Postdoctoral Science Foundation (2022TQ0290) and the Ministry of Science and Technology of China 343 (DL2023026004L).
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