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Title: Nanoscale surface chemistry directs the tunable assembly of silver octahedra into three two-dimensional plasmonic superlattices
Authors: Lee, Yih Hong
Shi, Wenxiong
Lee, Hiang Kwee
Jiang, Ruibin
Phang, In Yee
Cui, Yan
Isa, Lucio
Yang, Yijie
Wang, Jianfang
Li, Shuzhou
Ling, Xing Yi
Keywords: Nanoscience and Technology
Molecular Self-assembly
Issue Date: 2015
Source: Lee, Y. H., Shi, W., Lee, H. K., Jiang, R., Phang, I. Y., Cui, Y., . . . Ling, X. Y. (2015). Nanoscale surface chemistry directs the tunable assembly of silver octahedra into three two-dimensional plasmonic superlattices. Nature Communications, 6, 6990-. doi:10.1038/ncomms7990
Series/Report no.: Nature Communications
Abstract: A major challenge in nanoparticle self-assembly is programming the large-area organization of a single type of anisotropic nanoparticle into distinct superlattices with tunable packing efficiencies. Here we utilize nanoscale surface chemistry to direct the self-assembly of silver octahedra into three distinct two-dimensional plasmonic superlattices at a liquid/liquid interface. Systematically tuning the surface wettability of silver octahedra leads to a continuous superlattice structural evolution, from close-packed to progressively open structures. Notably, silver octahedra standing on vertices arranged in a square lattice is observed using hydrophobic particles. Simulations reveal that this structural evolution arises from competing interfacial forces between the particles and both liquid phases. Structure-to-function characterizations reveal that the standing octahedra array generates plasmonic ‘hotstrips’, leading to nearly 10-fold more efficient surface-enhanced Raman scattering compared with the other more densely packed configurations. The ability to assemble these superlattices on the wafer scale over various platforms further widens their potential applications.
DOI: 10.1038/ncomms7990
Schools: School of Materials Science & Engineering 
School of Physical and Mathematical Sciences 
Rights: © 2015 Macmillan Publishers Limited. This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit
Fulltext Permission: open
Fulltext Availability: With Fulltext
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