Time‐Controlled Colloidal Superstructures: Long‐Range Plasmon Resonance Coupling in Particle Monolayers

Volk, Kirsten; Fitzgerald, J.P.S.; Retsch, Markus; Karg, Matthias

doi:10.1002/adma.201503672

Cited by 67 publications

(90 citation statements)

References 23 publications

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“…Extinction spectra (right) show the plasmon resonance of the metal cores and long‐range dipolar plasmon coupling for decreasing interparticle distances. Reproduced with permission …”

Section: Discussionmentioning

confidence: 99%

Functional Materials Design through Hydrogel Encapsulation of Inorganic Nanoparticles: Recent Developments and Challenges

Karg

2015

Macro Chemistry & Physics

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The encapsulation of inorganic nanoparticles by hydrogel shells offers a promising pathway toward the design of functional building blocks for manifold applications. Hydrogel shells can be grown in a broad range of thicknesses, from a few tens to several hundreds of nanometer, allowing for encapsulation of inorganic particles with different composition, size, and shape. This gives access to a diverse toolbox of colloidal building blocks, which combine properties of the individual components in a multifunctional fashion. Hydrogel shells provide the nanoparticle cores with transparent, soft, and responsive coatings which improve the colloidal stability and allow interparticle distance control in colloidal assembly. The variation of the shell dimensions gives access to controlling the fill factor and ultimately distance‐dependent effects such as plasmon resonance coupling. This article summarizes the latest efforts in the preparation of core–shell colloids with different inorganic cores and hydrogel shells of various morphologies as well as the assembly of these building blocks into functional superstructures. It is demonstrated how the level of complexity can be increased from 1D to 3D by chemical treatment of core–shell particles, i.e., core growth or core removal, and template‐free as well as template‐assisted assembly leading to isotropic and anisotropic arrangements of particles.

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“…Extinction spectra (right) show the plasmon resonance of the metal cores and long‐range dipolar plasmon coupling for decreasing interparticle distances. Reproduced with permission …”

Section: Discussionmentioning

confidence: 99%

Functional Materials Design through Hydrogel Encapsulation of Inorganic Nanoparticles: Recent Developments and Challenges

Karg

2015

Macro Chemistry & Physics

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“…This is in agreement to the results of our previous work, were we observed pronounced coupling for Ag@Au-PNIPAM particles, with Ag@Au cores of 100 nm in diameter, in periodic arrays only for inter-particles distances smaller than 450 nm. [13] The blue line in figure 2 M corresponds to a spectrum measured for the binary honeycomb lattice. This spectrum shows an intermediate absorbance as compared to the two individual monolayers (red and black line).…”

Section: Monolayer Fabrication By Interface-mediated Self-assemblymentioning

confidence: 99%

“…[17] We have previously shown that this deformation depends on the time that the particles rest at the air/water interface. [13] Consequently, time might be used to fabricate particle arrays with various lattice spacings. Figure 2 C shows a TEM image recorded from a monolayer that was prepared by the sequential deposition of a first Au@Au-PNIPAM monolayer and a second Ag@Au-PNIPAM monolayer on the same TEM grid.…”

Section: Monolayer Fabrication By Interface-mediated Self-assemblymentioning

confidence: 99%

“…This method has proven to be a versatile approach for the preparation of hexagonally ordered colloidal monolayers that can be transferred onto solid supports maintaining a high degree of order. [12][13][14]16] Figure 2 A and B show TEM images of monolayers of the Au@Au-PNIPAM (A) and Ag@Au-PNIPAM (B) particles that were transferred from the air/water interface to a TEM grid by simply withdrawing the grid through the freely-floating monolayer at the interface. The detailed experimental description of this procedure can be found in the Experimental Section (3.).…”

Section: Monolayer Fabrication By Interface-mediated Self-assemblymentioning

confidence: 99%

“…Later, Volk et al have shown that the inter-particle distance in such lattices can be easily tuned by changing the dwell-time of the metal-hydrogel core-shell particle monolayer assembled at the air/water interface. [13] This time-control gave access to highly ordered plasmonic particle arrays with inter-particle distances ranging from 350 to 550 nm.…”

Section: Introductionmentioning

confidence: 99%

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Binary plasmonic honeycomb structures: High-resolution EDX mapping and optical properties

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Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Particulate Coatings with Optimized Haze Properties

Semmler

Bley

Taylor

et al. 2018

Adv Funct Materials

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The haze factor, which describes the fraction of light that is scattered when passing through a transparent material, is of general importance for any optical device, from milk glass shielding visibility while providing ambient lighting to solar cells that are optimized by sophisticated light management layers. Often, such active layers are fabricated from particulate materials that are deposited as thin films on a substrate. Here, the effect of structural arrangement, position, and orientation of particles on the resulting haze factor is investigated. A mathematical optimization model that iteratively alters the particle layer structure to maximize or minimize the haze factor for a range of optimization scenarios is designed. Colloidal self‐assembly techniques are then used to replicate typical particle structures found in the optimized designs and correlate the macroscopically measured haze values to the predictions of the optimization. The results indicate general design rules that control the haze value in particle layers. Non close‐packed structures with distributed scatterers and high degrees of order provide minimal haze values while chain‐like arrangements and small clusters maximize the haze of a particle layer. Finally, the findings are transferred to metal nanohole films as model transparent electrodes with controlled haze values.

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Time‐Controlled Colloidal Superstructures: Long‐Range Plasmon Resonance Coupling in Particle Monolayers

Cited by 67 publications

References 23 publications

Functional Materials Design through Hydrogel Encapsulation of Inorganic Nanoparticles: Recent Developments and Challenges

Functional Materials Design through Hydrogel Encapsulation of Inorganic Nanoparticles: Recent Developments and Challenges

Binary plasmonic honeycomb structures: High-resolution EDX mapping and optical properties

Particulate Coatings with Optimized Haze Properties

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