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Low‐Density 2D Superlattices Assembled via Directional DNA Bonding
Author(s) -
Miao Ziyi,
Zheng Cindy Y.,
Schatz George C.,
Lee Byeongdu,
Mirkin Chad A.
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202105796
Subject(s) - dodecahedron , superlattice , materials science , octahedron , crystallization , self assembly , crystallography , nanotechnology , anisotropy , lattice (music) , chemical physics , nanostructure , honeycomb , nanoparticle , substrate (aquarium) , crystal structure , chemical engineering , chemistry , optoelectronics , optics , physics , composite material , oceanography , geology , acoustics , engineering
It is critical to assemble nanoparticles (NPs) into superlattices with controlled symmetries and spacings on substrates for metamaterials applications, where such structural parameters dictate their properties. Here, we use DNA to assemble anisotropic NPs of three shapes—cubes, octahedra, and rhombic dodecahedra—on substrates and investigate their thermally induced reorganization into two‐dimensional (2D) crystalline films. We report two new low‐density 2D structures, including a honeycomb lattice based on octahedral NPs. The low‐density lattices favored here are not usually seen when particles are crystallized via other bottom‐up assembly techniques. Furthermore, we show that, consistent with the complementary contact model, a primary driving force for crystallization is the formation of directional, face‐to‐face DNA bonds between neighboring NPs and between NPs and the substrate. Our results can be used to deliberately prepare crystalline NP films with novel morphologies.