期刊
ADVANCED MATERIALS
卷 31, 期 29, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201901364
关键词
artificial magnetism; colloids; DNA nanotechnology; plasmonics; self-assembly
类别
资金
- National Research Foundation of Korea (NRF of Korea) [2017M3D1A1039421, 2016R1D1A1B03930454]
- KU-KIST School Project
- KU startup fund program [K1824561]
- NSF [ECCS-1807568]
- Institute of Molecular Medicine, Shanghai Jiao Tong University School of Medicine
- Atlanta Clinical and Translational Science Institute (ACTSI) [UL1TR000454]
- National Research Foundation of Korea [2016R1D1A1B03930454, 2017M3D1A1039421] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Nanoscale manipulation of magnetic fields has been a long-term pursuit in plasmonics and metamaterials, as it can enable a range of appealing optical properties, such as high-sensitivity circular dichroism, directional scattering, and low-refractive-index materials. Inspired by the natural magnetism of aromatic molecules, the cyclic ring cluster of plasmonic nanoparticles (NPs) has been suggested as a promising architecture with induced unnatural magnetism, especially at visible frequencies. However, it remains challenging to assemble plasmonic NPs into complex networks exhibiting strong visible magnetism. Here, a DNA-origami-based strategy is introduced to realize molecular self-assembly of NPs forming complex magnetic architectures, exhibiting emergent properties including anti-ferromagnetism, purely magnetic-based Fano resonances, and magnetic surface plasmon polaritons. The basic building block, a gold NP (AuNP) ring consisting of six AuNP seeds, is arranged on a DNA origami frame with nanometer precision. The subsequent hierarchical assembly of the AuNP rings leads to the formation of higher-order networks of clusters and polymeric chains. Strong emergent plasmonic properties are induced by in situ growth of silver upon the AuNP seeds. This work may facilitate the development of a tunable and scalable DNA-based strategy for the assembly of optical magnetic circuitry, as well as plasmonic metamaterials with high fidelity.
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