A Chemical Approach To Break the Planar Configuration of Ag Nanocubes into Tunable Two-Dimensional Metasurfaces
Publication in refereed journal

香港中文大學研究人員

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摘要Current 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.
著者Yang YJ, Lee YH, Phang IY, Jiang RB, Sim HYF, Wang JF, Ling XY
期刊名稱Nano Letters
出版年份2016
月份6
日期1
卷號16
期次6
出版社AMER CHEMICAL SOC
頁次3872 - 3878
國際標準期刊號1530-6984
電子國際標準期刊號1530-6992
語言英式英語
關鍵詞Ag nanocube; hot spot tailoring; mixed monolayer; Surface chemistry; surface-enhanced Raman scattering (SERS); tunable metasurfaces
Web of Science 學科類別Chemistry; Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science; Materials Science, Multidisciplinary; Nanoscience & Nanotechnology; Physics; Physics, Applied; Physics, Condensed Matter; Science & Technology - Other Topics

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