A Chemical Approach To Break the Planar Configuration of Ag Nanocubes into Tunable Two-Dimensional Metasurfaces
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AbstractCurrent plasmonic metasurfaces of nanocubes are limited to planar configurations, restricting the ability to create tailored local electromagnetic fields. Here, we report a new chemical strategy to achieve tunable metasurfaces with nonplanar nanocube orientations, creating novel lattice dependent field localization patterns. We manipulate the interfacial behaviors of Ag nanocubes by controlling the ratio of hydrophilic/hydrophobic molecules added in a binary thiol mixture during the surface functionalization step. The nano cube orientation at an oil/water interface can consequently be continuously tuned from planar to tilted and standing configurations, leading to the organization of Ag nanocubes into three unique large-area metacrystals, including square close-packed, linear, and hexagonal lattices. In particular, the linear and hexagonal metacrystals are unusual open lattices comprising nonplanar nanocubes, creating unique local electromagnetic field distribution patterns. Large-area "hot hexagons" with significant delocalization of hot spots form in the hexagonal metacrystal. With a lowest packing density of 24%, the hexagonal metacrystal generates nearly 350-fold stronger surface-enhanced Raman scattering as compared to the other denser-packing metacrystals, demonstrating the importance of achieving control over the geometrical and spatial orientation of the nanocubes in the metacrystals.
All Author(s) ListYang YJ, Lee YH, Phang IY, Jiang RB, Sim HYF, Wang JF, Ling XY
Journal nameNano Letters
Volume Number16
Issue Number6
Pages3872 - 3878
LanguagesEnglish-United Kingdom
KeywordsAg nanocube; hot spot tailoring; mixed monolayer; Surface chemistry; surface-enhanced Raman scattering (SERS); tunable metasurfaces
Web of Science Subject CategoriesChemistry; Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science; Materials Science, Multidisciplinary; Nanoscience & Nanotechnology; Physics; Physics, Applied; Physics, Condensed Matter; Science & Technology - Other Topics

Last updated on 2020-05-08 at 05:56