Controlled Gold Nanorod Reorientation and Hexagonal Order in Micromolded Gold Nanorod@pNIPAM Microgel Chain Arrays

Wagner, Tom; Nedilko, Alexander; Linn, Malte J.; Chigrin, Dmitry N.; Plessen, G. von; Böker, Alexander

doi:10.1002/smll.201603054

Cited by 7 publications

(3 citation statements)

References 44 publications

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“…The range of properties and thus of applications is enhanced by more complex microgel systems that contain additional functional comonomers and/or advanced architectures. Hence, microgels synthesized with different monomers in the inner (core) and outer (shell) region, , hollow microgels, which are microgels with a solvent-filled cavity at their center, , or the combination of microgels with other components, for example, rigid colloids, − have been reported. Properties, for example, uptake and release, deformability, and permeability, can be tuned via the cross-link density, the microgel morphology, and by external stimuli.…”

Section: Resultsmentioning

confidence: 99%

Anisotropic Hollow Microgels That Can Adapt Their Size, Shape, and Softness

et al. 2019

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The development of soft anisotropic building blocks is of great interest for various applications in soft matter. Furthermore, such systems would be important model systems for ordering phenomena in fundamental soft matter science. In this work, we address the challenge of creating hollow and anisotropically shaped thermoresponsive microgels, polymeric networks with a solvent filled cavity in their center that are swollen in a good solvent. Sacrificial elliptical hematite silica particles were utilized as a template for the synthesis of a cross-linked N-isopropylacrylamide (NIPAm) shell. By varying the amount of NIPAm, two anisotropic microgels were synthesized with either a thin or thick microgel shell. We characterized these precursor core–shell and the resulting hollow microgels using a combination of light, X-ray, and neutron scattering. New form factor models, accounting for the cavity, the polymer distribution and the anisotropy, have been developed for fitting the scattering data. With such models, we demonstrated the existence of the cavity and simultaneously the anisotropic character of the microgels. Furthermore, we show that the thickness of the shell has a major influence on the shape and the cavity dimension of the microgel after etching of the sacrificial core. Finally, the effect of temperature is investigated, showing that changes in size, softness, and aspect ratio are triggered by temperature.

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Section: Resultsmentioning

confidence: 99%

Anisotropic Hollow Microgels That Can Adapt Their Size, Shape, and Softness

et al. 2019

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“…Changing the molecular weight of the copolymer can vary the microphase-separated domains, which allows for the fabrication of channels with widths ranging from 5 to 50 nm. 751 As shown in Figure 13b, after spin-coating or dip-coating a Au NR solution on the template, Au NRs are selectively isolated in the degraded PMMA domains and oriented along these microdomains. The assemblies in the EE configuration can be obtained by adjusting the number of the deposition repetitions and the concentration of the NRs in the solution.…”

Section: Assembly On Planar Substratesmentioning

confidence: 99%

“…The poly(methyl methacrylate) (PMMA) domains are removed through exposure to saturated acetic acid vapor or oxygen plasma, generating an alternating grooved structure. Changing the molecular weight of the copolymer can vary the microphase-separated domains, which allows for the fabrication of channels with widths ranging from 5 to 50 nm . As shown in Figure b, after spin-coating or dip-coating a Au NR solution on the template, Au NRs are selectively isolated in the degraded PMMA domains and oriented along these microdomains.…”

Section: Assembly and Organization Of Gold Nanorodsmentioning

confidence: 99%

Gold Nanorods: The Most Versatile Plasmonic Nanoparticles

et al. 2021

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Gold nanorods (NRs), pseudo-one-dimensional rod-shaped nanoparticles (NPs), have become one of the burgeoning materials in the recent years due to their anisotropic shape and adjustable plasmonic properties. With the continuous improvement in synthetic methods, a variety of materials have been attached around Au NRs to achieve unexpected or improved plasmonic properties and explore state-of-the-art technologies. In this review, we comprehensively summarize the latest progress on Au NRs, the most versatile anisotropic plasmonic NPs. We present a representative overview of the advances in the synthetic strategies and outline an extensive catalogue of Au-NR-based heterostructures with tailored architectures and special functionalities. The bottom-up assembly of Au NRs into preprogrammed metastructures is then discussed, as well as the design principles. We also provide a systematic elucidation of the different plasmonic properties associated with the Au-NR-based structures, followed by a discussion of the promising applications of Au NRs in various fields. We finally discuss the future research directions and challenges of Au NRs.

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Self‐Assembled Colloidal Nanopatterns toward Unnatural Optical Meta‐Materials

Wang

Park

Zhu

et al. 2020

Adv Funct Materials

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2D nanoscale patterns have been extensively investigated for various applications including information storage devices, non‐volatile memory devices, chemical or biological sensors. Recently, such nanostructured patterns have been gaining lots of attention because of their potential uses as meta‐materials or meta‐surfaces with unnatural optical properties. In particular, self‐assembled colloidal monolayers of gold nanoparticles (NPs) have been demonstrated as optical meta‐materials for unnaturally high refractive index (neff > 4) at optical frequency. Raspberry‐like particles or spherical assembly of NPs are also investigated for negative or near‐zero index of refraction. Thanks to the recent advance in colloidal chemistry for shaping NPs with controlling the interaction, non‐close‐packed, or even non‐periodic colloidal nanostructures can be achieved, which may be potentially useful for optical meta‐surfaces. In this article, a brief introduction of optical meta‐materials is provided and recent progress for high‐index and negative‐index meta‐materials are reviewed. In the second part, the meta‐surfaces will be briefly described including fundamental principle and some of the key potential applications. Finally, the recent experimental progress of high‐precision self‐assembly for the meta‐surface fabrication will be discussed.

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Controlled Gold Nanorod Reorientation and Hexagonal Order in Micromolded Gold Nanorod@pNIPAM Microgel Chain Arrays

Cited by 7 publications

References 44 publications

Anisotropic Hollow Microgels That Can Adapt Their Size, Shape, and Softness

Anisotropic Hollow Microgels That Can Adapt Their Size, Shape, and Softness

Gold Nanorods: The Most Versatile Plasmonic Nanoparticles

Self‐Assembled Colloidal Nanopatterns toward Unnatural Optical Meta‐Materials

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