Low‐Density 2D Superlattices Assembled via Directional DNA Bonding
- Department of Materials Science and Engineering Northwestern University 2220 Campus Drive Evanston IL 60208 USA, International Institute for Nanotechnology Northwestern University USA
- Department of Chemistry Northwestern University 2145 Sheridan Road Evanston IL 60208 USA, International Institute for Nanotechnology Northwestern University USA
- X-ray Science Division Argonne National Laboratory 9700 South Cass Avenue Argonne IL 60439 USA
- Department of Materials Science and Engineering Northwestern University 2220 Campus Drive Evanston IL 60208 USA, Department of Chemistry Northwestern University 2145 Sheridan Road Evanston IL 60208 USA, International Institute for Nanotechnology Northwestern University USA
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.
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC02-06CH11357; SC0000989
- OSTI ID:
- 1810204
- Journal Information:
- Angewandte Chemie, Journal Name: Angewandte Chemie Journal Issue: 35 Vol. 133; ISSN 0044-8249
- Publisher:
- Wiley Blackwell (John Wiley & Sons)Copyright Statement
- Country of Publication:
- Germany
- Language:
- English
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