Nanowrinkled thin films for nanorod assembly in microfluidics

Tadimety, Amogha; Kready, Kasia M.; Chorsi, Hamid T.; Zhang, Lina; Palinski, Timothy J.; Zhang, John X. J.

doi:10.1007/s10404-018-2177-7

Cited by 6 publications

(2 citation statements)

References 14 publications

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“…Hierarchical assemblies can be realized by stamping the PDMS mold onto evaporating Au NR droplets. , PDMS channels can also be fabricated by wrinkling a PDMS film on an elastic substrate and inducing the buckling instability. Highly oriented sinusoidal wrinkles can be produced, which allow for the preparation of highly oriented Au NR assemblies in a high-throughput process. − Copolymers can also be used to produce wrinkle-morphology-based templates. A copolymer, such as polystyrene- block -poly(methyl methacrylate) (PS- b -PMMA), is first spin-coated and then phase-separated through thermal annealing to form lamellar domains perpendicular to the substrate.…”

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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Section: Assembly and Organization Of Gold Nanorodsmentioning

confidence: 99%

Gold Nanorods: The Most Versatile Plasmonic Nanoparticles

et al. 2021

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“…In contrast, colloidal nanowire fabrication via self-assembly is scalable and has a reduced environmental footprint. Various bottom-up methods have been employed to assemble metal NPs into lines and stripes, including spin coating [20,22,23], dip coating [19,24], microfluidics [25] and capillary-assisted assembly [26]. The above-mentioned papers partially include testing the conductivity of the fabricated linearly assembled NPs.…”

Section: Introductionmentioning

confidence: 99%

Heading toward Miniature Sensors: Electrical Conductance of Linearly Assembled Gold Nanorods

et al. 2023

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Metal nanoparticles are increasingly used as key elements in the fabrication and processing of advanced electronic systems and devices. For future device integration, their charge transport properties are essential. This has been exploited, e.g., in the development of gold-nanoparticle-based conductive inks and chemiresistive sensors. Colloidal wires and metal nanoparticle lines can also be used as interconnection structures to build directional electrical circuits, e.g., for signal transduction. Our scalable bottom-up, template-assisted self-assembly creates gold-nanorod (AuNR) lines that feature comparably small widths, as well as good conductivity. However, the bottom-up approach poses the question about the consistency of charge transport properties between individual lines, as this approach leads to heterogeneities among those lines with regard to AuNR orientation, as well as line defects. Therefore, we test the conductance of the AuNR lines and identify requirements for a reliable performance. We reveal that multiple parallel AuNR lines (>11) are necessary to achieve predictable conductivity properties, defining the level of miniaturization possible in such a setup. With this system, even an active area of only 16 µm2 shows a higher conductance (~10−5 S) than a monolayer of gold nanospheres with dithiolated-conjugated ligands and additionally features the advantage of anisotropic conductance.

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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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Nanowrinkled thin films for nanorod assembly in microfluidics

Cited by 6 publications

References 14 publications

Gold Nanorods: The Most Versatile Plasmonic Nanoparticles

Gold Nanorods: The Most Versatile Plasmonic Nanoparticles

Heading toward Miniature Sensors: Electrical Conductance of Linearly Assembled Gold Nanorods

Self‐Assembled Colloidal Nanopatterns toward Unnatural Optical Meta‐Materials

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