A facile post-assembly approach for the fabrication of non-close-packed gold nanocrystal arrays from binary nanocrystal superlattices

Here, we demonstrate a novel approach for fabricating non-close-packed gold nanocrystal arrays using facile one-step post-modification of a Cs₄PbBr₆-Au binary nanocrystal superlattice by electron beam etching of the perovskite phase. The proposed methodology can serve as a promising approach for the scalable preparation of a vast library of non-close-packed nanoparticulate superstructures with various morphologies composed of numerous colloidal nanocrystals.