Chiral assemblies of pinwheel superlattices on substrates
Chiral assemblies of pinwheel superlattices on substrates
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DOI：
10.1038/s41586-022-05384-8
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发表时间：
2022-06
期刊：
影响因子：
64.8
通讯作者：
Shan Zhou;Jiahui Li;Jun Lu;Haihua Liu;Jiyoung Kim;A. Kim;Lehan Yao;Chang Liu;Chang Qian-Chang-Qi
中科院分区：
文献类型：
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作者：
Shan Zhou;Jiahui Li;Jun Lu;Haihua Liu;Jiyoung Kim;A. Kim;Lehan Yao;Chang Liu;Chang Qian-Chang-Qi
手性超晶格独特的拓扑结构和物理特性使得它们从纳米粒子的自组装成为备受追捧的，但在（Meta）材料方面具有挑战性。在这里，我们表明，四面体金纳米粒子可以从钙钛矿样，低密度相与角到角连接到风车组件与角到边连接和更密集的包装。而角共享组件是非手性的，风车超晶格成为强烈的镜像不对称的固体衬底上的手征措施所证明的。液相透射电子显微镜和计算模型表明，纳米颗粒之间的货车范德华力和静电相互作用控制热力学平衡。四面体之间的可变角到边连接使得能够微调手性。的双层超晶格的域显示出很强的手性活性，通过光子诱导的近场电子显微镜和时域有限差分模拟确定。衬底支撑的手性超晶格的简单性和多功能性促进了具有不寻常的光学、机械和电子特性的亚结构涂层的制造。
The unique topology and physics of chiral superlattices make their self-assembly from nanoparticles highly sought after yet challenging in regard to (meta)materials, –. Here we show that tetrahedral gold nanoparticles can transform from a perovskite-like, low-density phase with corner-to-corner connections into pinwheel assemblies with corner-to-edge connections and denser packing. Whereas corner-sharing assemblies are achiral, pinwheel superlattices become strongly mirror asymmetric on solid substrates as demonstrated by chirality measures. Liquid-phase transmission electron microscopy and computational models show that van der Waals and electrostatic interactions between nanoparticles control thermodynamic equilibrium. Variable corner-to-edge connections among tetrahedra enable fine-tuning of chirality. The domains of the bilayer superlattices show strong chiroptical activity as identified by photon-induced near-field electron microscopy and finite-difference time-domain simulations. The simplicity and versatility of substrate-supported chiral superlattices facilitate the manufacture of metastructured coatings with unusual optical, mechanical and electronic characteristics.