Nanoscale surface chemistry directs the tunable assembly of silver octahedra into three two-dimensional plasmonic superlattices

Yih Hong Lee, Wenxiong Shi, Hiang Kwee Lee, Ruibin Jiang, In Yee Phang, Yan Cui, Lucio Isa, Yijie Yang, Jianfang Wang, Shuzhou Li and Xing Yi Ling ()
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Yih Hong Lee: School of Physical and Mathematical Sciences, Nanyang Technological University
Wenxiong Shi: School of Materials Science and Engineering, Nanyang Technological University
Hiang Kwee Lee: School of Physical and Mathematical Sciences, Nanyang Technological University
Ruibin Jiang: The Chinese University of Hong Kong
In Yee Phang: Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research)
Yan Cui: School of Physical and Mathematical Sciences, Nanyang Technological University
Lucio Isa: Laboratory for Interfaces, Soft matter and Assembly, ETH Zurich
Yijie Yang: School of Physical and Mathematical Sciences, Nanyang Technological University
Jianfang Wang: The Chinese University of Hong Kong
Shuzhou Li: School of Materials Science and Engineering, Nanyang Technological University
Xing Yi Ling: School of Physical and Mathematical Sciences, Nanyang Technological University

Nature Communications, 2015, vol. 6, issue 1, 1-7

Abstract: 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.

Date: 2015
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DOI: 10.1038/ncomms7990

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