Nanowire-assisted self-assembly of one-dimensional nanocrystal superlattice chains

Ordered and self-assembled nanocrystal superstructures have attracted intense attention due to their ability to transfer unique nanoscale properties to large scale. Despite tremendous progress in colloidal assembly, it remains a challenge to assemble isotropic nanocrystals into 1D superlattice chains (1DSCs). Herein, we report a facile method to synthesize metal halide perovskite 1DSCs. It is found that the formation of 1DSCs is ascribed to the simultaneous generation of NWs that provide directional interactions in solution, and the driving force for the alignment of CsPbBr3 NCs is derived from dipole-dipole interactions. The stability of NCs can be improved due to collective properties from the nanosheet unit in 1DSCs, which is also adapted to build light-emitting diode devices. This direct synthesis method opens up a promising road for the synthesis of 1DSCs and guides the fabrication of other superstructures.