Chemical and Physical Properties of Photonic Noble‐Metal Nanomaterials

Cai, Yiyu; Choi, Yun Chang; Kagan, Cherie R.

doi:10.1002/adma.202108104

Cited by 15 publications

(14 citation statements)

References 425 publications

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“…After exposure through a photomask, superlattices in the UV-irradiated regions (i.e., the triangles in Figure g,h) remain on the substrate, while the unexposed/un-cross-linked NCs are dissolved by solvents. These hierarchical NC patterns with structural ordering at different length scales have been considered as ideal designer tools to produce functional materials with strong coupling of optical, mechanical, and transport properties. ,,− Examples include the hybridized polaritons , and plasmonic–photonic coupling, which are promising in optical sensing and other applications.…”

Section: Resultsmentioning

confidence: 99%

“…These hierarchical NC patterns with structural ordering at different length scales have been considered as ideal designer tools to produce functional materials with strong coupling of optical, mechanical, and transport properties. 7,28,46−51 Examples include the hybridized polaritons 23,51 and plasmonic− photonic coupling, 48 which are promising in optical sensing and other applications.…”

Section: Stabilization Of 3d Nc Superlattices Viamentioning

confidence: 99%

“…1,14 For instance, varying the deformable hydrocarbon ligands changes the effective sizes and softness of constituent NCs, 15 introduces the "many body effect", and leads to significantly expanded library of binary NC superlattices. 16,17 Superlattices with such diverse core/ligand chemistry, structures, and collective interactions (electronic, 18,19 thermal, 20 magnetic, 21,22 photonic, 23,24 etc. ), in analogy to metamaterials, are promising for next-generation electronics, 19,25−27 photonics, 28 catalysis, 29,30 and biosensing.…”

Section: Introductionmentioning

confidence: 99%

“…Self-assembled superlattices of inorganic colloidal nanocrystals (NCs) have been a powerful material platform for both understanding the crystallization chemistry at nanoscale and exploring the emergent functionalities associated with their structural hierarchy and compositional tunability. − The formation of NC superlattices involves a set of weak forces (van der Waals, dipole–dipole, electrostatic, , and hydrogen bonding) between the NC building blocks, depending on the chemical nature of their surface ligands . These weak interparticle interactions add important perturbations to the classical hard-sphere space-filling model and thus create structures and functionalities not available in their microscale or bulk counterparts. , For instance, varying the deformable hydrocarbon ligands changes the effective sizes and softness of constituent NCs, introduces the “many body effect”, and leads to significantly expanded library of binary NC superlattices. , Superlattices with such diverse core/ligand chemistry, structures, and collective interactions (electronic, , thermal, magnetic, , photonic, , etc. ), in analogy to metamaterials, are promising for next-generation electronics, ,− photonics, catalysis, , and biosensing. , …”

Section: Introductionmentioning

confidence: 99%

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A General Approach to Stabilize Nanocrystal Superlattices by Covalently Bonded Ligands

Wang

Tian

et al. 2023

ACS Nano

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Self-assembled inorganic nanocrystal (NC) superlattices are powerful material platforms with diverse structures and emergent functionalities. However, their applications suffer from the low structural stability against solvents and other stimuli, due to the weak interparticle interactions. Existing strategies to stabilize NC superlattices typically require the design and incorporation of special ligands prior to self-assembly and are only applicable to superlattices of certain NCs, ligands, and structures. Here we report a general method to stabilize superlattices of various NC compositions and structures via strong, covalently bonded ligands. The core is the use of light-triggered, nitrene-based cross-linkers that do not interfere the self-assembly process while nonspecifically and effectively bonding the native ligands of NCs. The stabilized 2D and 3D superlattices of metal, semiconductor, and magnetic NCs retain their structures when being exposed to solvents of different polarities (from toluene to water) and show high thermal stability and mechanical rigidity. This can further stabilize binary NC superlattices, beyond those achievable in previous methods. Stabilized superlattices show robust and reproducible functionalities, for instance, when serving as reusable substrates for surface enhanced Raman spectroscopy. These results create more possibilities in exploiting the impressive library of NC superlattices in a broad scope of applications.

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Section: Resultsmentioning

confidence: 99%

Section: Stabilization Of 3d Nc Superlattices Viamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A General Approach to Stabilize Nanocrystal Superlattices by Covalently Bonded Ligands

Wang

Tian

et al. 2023

ACS Nano

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“…Supercrystals are tailored through particle-particle interactions and the choice of their building blocks. [1][2][3] In plasmonic metal NP supercrystals with periodic…”

Section: Introductionmentioning

confidence: 99%

Optimizing Interparticle Gaps in Large‐Scale Gold Nanoparticle Supercrystals for Flexible Light‐Matter Coupling

Schulz

Lange

2022

Advanced Optical Materials

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order on scales larger than optical wavelengths, new optical excitations can emerge. The plasmons of different NPs interact, creating coherent collective excitations that propagate through the lattice. [4][5][6] The collective plasmonic modes couple to photons forming hybrid quasiparticles, plasmon polaritons, with properties different from the excitations of the individual NPs. Depending on the supercrystal geometry, polaritons in different lightmatter coupling regimes can be realized.The reduced coupling strength g η ω =with the coupling strength g normalized to the frequency of the confined mode ω is an established quantity to classify lightmatter interaction. [7] The ultrastrong coupling regime, where 0.1 < η < 1, and the deep strong coupling regime, where η > 1 have only emerged in the past decade. The lower limit of η = 0.1 has been by now well established as the regime where observable effects of lightmatter interaction beyond the Purcell effect emerge. These strong light-matter coupling regimes promote a wide range of interesting optical effects, nonlinear and quantum. [8][9][10] Plasmonic supercrystals present the first realization of a deepstrong coupling material at optical frequencies. [4] In plasmonic supercrystals, the effective coupling strength and polariton properties depend on the fill factor, that is, the particle sizes and gap sizes between the particles; cf. Figure 1. [11] Effects such as enhanced Raman scattering scale with the resulting local fields. [13] In principle, the geometry-dependence of the polaritonic properties allows accessing different regimes of light-matter coupling by material design. However, to be able to benefit from the tunability granted by the supercrystal geometry, supercrystals composed of uniform constituents with long-range order and controlled gap sizes are required on large (>1 µm 2 ) dimensions. Fundamental studies as well as applications require robust, reproducible materials with small geometry variations.Herein, we present guidelines for the preparation of high quality plasmonic supercrystals with controlled gap sizes for commonly available gold nanoparticle (AuNP) sizes. The correct choice of the stabilizing organic ligand molecule is very important for obtaining defined supercrystals. It facilitates self-organization into large supercrystals and governs the gap sizes.Periodic arrangements of plasmonic nanoparticles, supercrystals, feature strong light-matter interaction. The light-matter coupling strength depends on the particle diameter and on the interparticle gaps, which provides a lever for controlling it. To facilitate material design, experimental data is analyzed with focus on how the reproducibility and tunability of the gap sizes change with the employed nanoparticles (particle size and molecular weight of the stabilizing organic ligands). A different behavior of the polystyrene-based ligands was found depending on their molecular weight with important consequences for the correlation of nanoparticle diameter and resulting gaps in the supercrystals...

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Open and Close‐Packed, Shape‐Engineered Polygonal Nanoparticle Metamolecules with Tailorable Fano Resonances

et al. 2023

Self Cite

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A top‐down lithographic patterning and deposition process is reported for producing nanoparticles (NPs) with well‐defined sizes, shapes, and compositions that are often not accessible by wet‐chemical synthetic methods. These NPs are ligated and harvested from the substrate surface to prepare colloidal NP dispersions. Using a template‐assisted assembly technique, fabricated NPs are driven by capillary forces to assemble into size‐ and shape‐engineered templates and organize into open or close‐packed multi‐NP structures or NP metamolecules. The sizes and shapes of the NPs and of the templates control the NP number, coordination, interparticle gap size, disorder, and location of defects such as voids in the NP metamolecules. The plasmonic resonances of polygonal‐shaped Au NPs are exploited to correlate the structure and optical properties of assembled NP metamolecules. Comparing open and close‐packed architectures highlights that introduction of a center NP to form close‐packed assemblies supports collective interactions, altering magnetic optical modes and multipolar interactions in Fano resonances. Decreasing the distance between NPs strengthens the plasmonic coupling, and the structural symmetries of the NP metamolecules determine the orientation‐dependent scattering response.

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Chemical and Physical Properties of Photonic Noble‐Metal Nanomaterials

Cited by 15 publications

References 425 publications

A General Approach to Stabilize Nanocrystal Superlattices by Covalently Bonded Ligands

A General Approach to Stabilize Nanocrystal Superlattices by Covalently Bonded Ligands

Optimizing Interparticle Gaps in Large‐Scale Gold Nanoparticle Supercrystals for Flexible Light‐Matter Coupling

Open and Close‐Packed, Shape‐Engineered Polygonal Nanoparticle Metamolecules with Tailorable Fano Resonances

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