Two-Dimensional Bipyramid Plasmonic Nanoparticle Liquid Crystalline Superstructure with Four Distinct Orientational Packing Orders

Shi, Qianqian; Jye, Kae; Sikdar, Debabrata; Yap, Lim Wei; Premaratne, Malin; Cheng, Wenlong

doi:10.1021/acsnano.5b06206

Cited by 108 publications

(123 citation statements)

References 46 publications

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“…A decrease in translational (orientational) order relative to the bulk thus suggests a resemblance to liquid (plastic) crystals in more conventional systems. In fact, various instances of nanoparticle-based liquid crystalline structures with good translational order have been demonstrated using nanorods 29 and bipyramids 34 as building blocks.…”

Section: Resultsmentioning

confidence: 99%

Creating two self-assembly micro-environments to achieve supercrystals with dual structures using polyhedral nanoparticles

et al. 2018

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Organizing nanoparticles into supercrystals comprising multiple structures remains challenging. Here, we achieve one assembly with dual structures for Ag polyhedral building blocks, comprising truncated cubes, cuboctahedra, truncated octahedra, and octahedra. We create two micro-environments in a solvent evaporation-driven assembly system: one at the drying front and one at the air/water interface. Dynamic solvent flow concentrates the polyhedra at the drying front, generating hard particle behaviors and leading to morphology-dependent densest-packed bulk supercrystals. In addition, monolayers of nanoparticles adsorb at the air/liquid interface to minimize the air/liquid interfacial energy. Subsequent solvent evaporation gives rise to various structurally diverse dual-structure supercrystals. The topmost monolayers feature distinct open crystal structures with significantly lower packing densities than their densest-packed supercrystals. We further highlight a 3.3-fold synergistic enhancement of surface-enhanced Raman scattering efficiency arising from these dual-structure supercrystals as compared to a uniform one.

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Section: Resultsmentioning

confidence: 99%

Creating two self-assembly micro-environments to achieve supercrystals with dual structures using polyhedral nanoparticles

et al. 2018

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“…By virtue of the surface plasmon resonances (SPRs) in metallic or composite nanoparticles (NPs) it has been possible to realise different nanoparticle-based architectures exhibiting numerous exotic optical properties—such as directed narrowband-scattering, resonance-enhanced wide-band absorption, as well as intense near-field confinement and enhancement 1 2 3 4 5 6 7 . These traits enabled plasmonic NPs to feature in a wide variety of applications ranging from light harvesting to sensing, and also from guided transportation of energy to energy localisation for photothermal therapeutics and imaging 3 4 5 6 7 8 9 10 11 12 13 14 . Each NP enacts a tuneable optical antenna that allows one to tailor the spectral position, width, and intensity of the SPR as functions of the NP’s size, shape, composition, and surrounding medium 15 16 17 18 19 .…”

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confidence: 99%

Theory of tailorable optical response of two-dimensional arrays of plasmonic nanoparticles at dielectric interfaces

Sikdar

Kornyshev

2016

Sci Rep

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Two-dimensional arrays of plasmonic nanoparticles at interfaces are promising candidates for novel optical metamaterials. Such systems materialise from ‘top–down’ patterning or ‘bottom–up’ self-assembly of nanoparticles at liquid/liquid or liquid/solid interfaces. Here, we present a comprehensive analysis of an extended effective quasi-static four-layer-stack model for the description of plasmon-resonance-enhanced optical responses of such systems. We investigate in detail the effects of the size of nanoparticles, average interparticle separation, dielectric constants of the media constituting the interface, and the nanoparticle position relative to the interface. Interesting interplays of these different factors are explored first for normally incident light. For off-normal incidence, the strong effects of the polarisation of light are found at large incident angles, which allows to dynamically tune the reflectance spectra. All the predictions of the theory are tested against full-wave simulations, proving this simplistic model to be adequate within the quasi-static limit. The model takes seconds to calculate the system’s optical response and makes it easy to unravel the effect of each system parameter. This helps rapid rationalization of experimental data and understanding of the optical signals from these novel ‘metamaterials’, optimised for light reflection or harvesting.

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“…It is well established fact that the closer the laser excitation wavelength is to the plasmon resonance peak the stronger will be the SERS response. [ 6,27,58 ] We further evaluated the near‐field distribution in the plasmonic array by using 633 and 550 nm as the excitation wavelengths. As shown in Figure S6 in the Supporting Information, the hot‐spots at 633 nm are more intense than those seen for 550 nm, which indicated that 633 nm is a better choice of laser excitation wavelength for SERS performance.…”

Section: Resultsmentioning

confidence: 99%

Multiscale Patterned Plasmonic Arrays for Highly Sensitive and Uniform SERS Detection

Chen

Yin

Sikdar

et al. 2020

Adv Materials Inter

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The ability to rationally manipulate plasmonic nanoparticles into well‐defined hierarchically patterned arrays is crucial for exploiting the property of novel optical metamaterials and is of significance for designing plasmonic devices. Before the benefits offered by hybridized plasmon modes may be fully utilized in practice, programmable plasmonic nanostructures with preset morphology and composition should be developed in advance. However, it remains a grand challenge to fabricate large‐area patterned array with highly ordered nanostructure in a low‐expertise and straightforward route. Here, high‐throughput fabrication of multiscale patterned plasmonic arrays of macroscopic surfaces and nanoscale ordering is reported. The bottom‐up ligand‐guided crystallization of nanoparticles takes place upon drying‐mediated self‐assembly at air/solution/substrate interfaces, while the macroscopic topography is regulated by rational control over local nucleation in microwrinkles. Using bimetallic nanobricks as meta‐atoms, it is demonstrated that the configuration of patterned arrays can be finely engineered as required by simply customizing the wrinkled template. It is also proved that the fabricated plasmonic arrays exhibit nearly uniform hot‐spot distribution across the entire surface, which makes them as practical substrates for the surface‐enhanced Raman scattering (SERS) applications. This facile yet efficient methodology suggests a versatile step toward the fabricating of hierarchically patterned architectures for practical device construction.

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Two-Dimensional Bipyramid Plasmonic Nanoparticle Liquid Crystalline Superstructure with Four Distinct Orientational Packing Orders

Cited by 108 publications

References 46 publications

Creating two self-assembly micro-environments to achieve supercrystals with dual structures using polyhedral nanoparticles

Creating two self-assembly micro-environments to achieve supercrystals with dual structures using polyhedral nanoparticles

Theory of tailorable optical response of two-dimensional arrays of plasmonic nanoparticles at dielectric interfaces

Multiscale Patterned Plasmonic Arrays for Highly Sensitive and Uniform SERS Detection

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