Publication date: 17th July 2025
The assembly of nanoparticle building blocks is a compelling platform for designer, complex materials. Monodisperse nanocrystals (NCs) functionalized with capping ligands readily form long-range ordered superlattices (SLs) [1], in which novel collective properties can be adjusted by varying composition, shape, and size of the NCs. Lead halide perovskite NC SLs have been much thought after in this research area due to collective phenomena such as superfluorescence, which was first observed in 3D single-component CsPbBr3 NC SLs [2]. Co-assembly of CsPbBr3 NCs with a variety of other building blocks has enabled the exploration of structure-properties relationships of superfluorescence and the design of diverse novel SLs.[3]
This study focuses on assembling CsPbBr3 nanocubes and Au nanospheres into binary SLs, which have the potential to exhibit novel collective properties arising from exciton-plasmon interactions. Six different types of SLs were obtained, namely NaZn13, MgZn2, CaCu5, AlB2, AB2 and NaCl, and similar superstructures were extended using building blocks of different sizes (from 5 to 46 nm). We demonstrate how the superlattice structure and NCs size affect the collective optical properties.
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