Emulsions-directed assembly of gold nanoparticles to molecularly-linked and size-controlled spherical aggregates

Hussain, Irshad; Zhang, Haifei; Barauskas, Justas; Cooper, Andrew I.

doi:10.1016/j.jcis.2010.06.016

Cited by 18 publications

(13 citation statements)

References 33 publications

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“…Thus far, numerous techniques have been developed for assembling AuNPs into novel functional materials. For example, the assembly of AuNPs can easily be realized in solution by mixing them with multithiol molecules such as dithiol alkane and pentaerythritol tetrakis‐3‐mercaptopropionate . Unfortunately, this approach is apparently not suitable for forming controllable aggregates of AuNPs in vivo.…”

Section: Methodsmentioning

confidence: 99%

Light‐Triggered Assembly of Gold Nanoparticles for Photothermal Therapy and Photoacoustic Imaging of Tumors In Vivo

et al. 2016

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Photocross-linkable Au nanoparticles are prepared through surface decoration of photolabile diazirine moieties. Both in vitro and in vivo studies indicate that the light-triggered cross-linking can dramatically shift the surface plasmon resonance of Au nanoparticles to near-infrared regions, which in consequence remarkably enhances their efficacy for photothermal therapy and photoacoustic imaging of tumors in vivo.

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Section: Methodsmentioning

confidence: 99%

Light‐Triggered Assembly of Gold Nanoparticles for Photothermal Therapy and Photoacoustic Imaging of Tumors In Vivo

et al. 2016

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“…Similar approaches appear in the literature [28][29][30] for the fabrication of spherical clusters of NPs with different composition, including metallic ones, but little attention was given to their optical properties and in particular to their ability to sustain a magnetic dipole resonance. The idea of this method is to use emulsion droplets as nanocontainers to confine a discrete number of NPs.…”

Section: Fabrication Of Spherical Silver Nanoparticle Clustersmentioning

confidence: 97%

A bottom-up approach to fabricate optical metamaterials by self-assembled metallic nanoparticles

Dintinger¹,

Mühlig²,

Rockstuhl³

et al. 2012

Opt. Mater. Express

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Abstract:We introduce a novel bottom-up approach to fabricate by self assembly a metamaterial from metallic nanoparticles in a two-step process. In the first step, a metamaterial made of densely packed silver nanoparticles is required. The material dispersion with increasing nanoparticle densities, from dispersed to randomly packed nanoparticles, was measured by spectroscopic ellipsometry, demonstrating high permittivity values in the visible. In the second step, this material was used to prepare spherical clusters by a method based on oil-in-water emulsion. The optical properties of these clusters were equally investigated by spectroscopic means. Comparisons with rigorous numerical simulations clearly indicate that, depending on the cluster size, their spectral response can be unambiguously associated with the excitation of a magnetic dipole resonance. As a consequence, such spherical clusters are promising building blocks for future metamaterials possessing a magnetic response in the visible range. . 13. R. Paniagua-Domínguez, F. López-Tejeira, R. Marqués, and J. A. Sánchez-Gil, "Metallo-dielectric core-shell nanospheres as building blocks for optical three-dimensional isotropic negative-index metamaterials," New J. ©2012 Optical Society of America

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“…In a second step, a densification will take place to achieve higher NP volume filling factors in the droplet. The approach was already discussed in the literature [24][25][26] and led to the fabrication of spherical clusters of NPs with different composition. A few experiments were done on metallic particles without considering their optical properties in details.…”

Section: Silver Nanoparticle Clusters With High Volume Filling Fractionmentioning

confidence: 99%

Plasmonic nanoparticles for a bottom-up approach to fabricate optical metamaterials

Dintinger

Scharf

2012

SPIE Proceedings

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We investigate experimentally metallic nanoparticle composites fabricated by bottom-up techniques as potential candidates for optical metamaterials. Depending on the plasmonic resonances sustained by individual NPs and their nanoscale organization into larger meta-atoms, various properties might emerge. Here, the focus of our contribution is on the fabrication and optical characterization of silver NP clusters with a spherical shape. We start with the characterisation of the "bulk" dielectric constants of silver NP inks by spectroscopic ellipsometry for different nanoparticle densities (i.e from strongly diluted dispersions to solid randomly packed films). The inks are then used to prepare spherical nanoparticle clusters by an oil-in water emulsion technique. The study of their optical properties demonstrates their ability to support Mie resonances in the visible. These resonances are associated with the excitation of a magnetic dipole, which constitutes a prerequisite to the realization of metamaterials with negative permeability.

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Emulsions-directed assembly of gold nanoparticles to molecularly-linked and size-controlled spherical aggregates

Cited by 18 publications

References 33 publications

Light‐Triggered Assembly of Gold Nanoparticles for Photothermal Therapy and Photoacoustic Imaging of Tumors In Vivo

Light‐Triggered Assembly of Gold Nanoparticles for Photothermal Therapy and Photoacoustic Imaging of Tumors In Vivo

A bottom-up approach to fabricate optical metamaterials by self-assembled metallic nanoparticles

Plasmonic nanoparticles for a bottom-up approach to fabricate optical metamaterials

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