Low‐Density 2D Superlattices Assembled via Directional DNA Bonding
Abstract
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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jul 26, 2021
- Source ID
- 10.1002/anie.202105796
Entities
People
- Byeongdu Lee
- Chad Mirkin
- Cindy Y Zheng
- George C. Schatz
- Ziyi Miao
Organizations
- Air Force Office of Scientific Research
- Air Force Research Laboratory
- Argonne National Laboratory
- National Science Foundation of Sri Lanka
- Northwestern University
- Sherman Fairchild Foundation
- United States Department of Energy