Synthesis of silica-core gold nanoshells and some modifications/variations

García-Soto, Mariano J.; González‐Ortega, Omar

doi:10.1007/s13404-016-0188-2

Cited by 25 publications

(29 citation statements)

References 82 publications

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“…Assuming that all the Au 3+ from the HAuCl 4 is reduced to Au 0 in the synthesis and consumed to form the AuSeeds, the total mass of produced Au 0 was calculated to be 1.78 × 10 −3 g. The corresponding theoretical concentration of AuSeeds was thus determined to be 0.037 g/L or 2.32 × 10 17 NPs/L, which is in agreement with the order of magnitude of NPs concentration reported in the literature for this synthesis. In the review article by Garcıa-Soto et al [ 34 ] the particle concentration is reported to be between 10 17 and 10 18 particles per L. Consistently with the above calculations, our ICP-AES analysis resulted in a Au 0 concentration of 0.028 g/L in the AuSeeds dispersion. This led to a number concentration of 1.77 × 10 17 NPs/L when the average diameter determined by TEM is considered.…”

Section: Resultssupporting

confidence: 90%

“…The alkaline pH of the solution causes the Au(OH) 4 − to be the predominant gold ion species. When the Au salt solution is added to the mixture of THP and formaldehyde, THP is able to partially reduce Au 3+ to form THP-Au + complexes, and the formaldehyde reduces these Au + species to produce Au 0 NPs [ 34 ]. Due to the complexation between THP and gold, phosphine groups could be expected at the surface of Au NPs, which would result in positively charged NPs.…”

Section: Resultsmentioning

confidence: 99%

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Gold-seeded Lithium Niobate Nanoparticles: Influence of Gold Surface Coverage on Second Harmonic Properties

et al. 2021

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Hybrid nanoparticles composed of an efficient nonlinear optical core and a gold shell can enhance and tune the nonlinear optical emission thanks to the plasmonic effect. However the influence of an incomplete gold shell, i.e., isolated gold nano-islands, is still not well studied. Here LiNbO3 (LN) core nanoparticles of 45 nm were coated with various densities of gold nano-seeds (AuSeeds). As both LN and AuSeeds bear negative surface charge, a positively-charged polymer was first coated onto LN. The number of polymer chains per LN was evaluated at 1210 by XPS and confirmed by fluorescence titration. Then, the surface coverage percentage of AuSeeds onto LN was estimated to a maximum of 30% using ICP-AES. The addition of AuSeeds was also accompanied with surface charge reversal, the negative charge increasing with the higher amount of AuSeeds. Finally, the first hyperpolarizability decreased with the increase of AuSeeds density while depolarization values for Au-seeded LN were close to the one of bare LN, showing a predominance of the second harmonic volumic contribution.

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Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Gold-seeded Lithium Niobate Nanoparticles: Influence of Gold Surface Coverage on Second Harmonic Properties

et al. 2021

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“…The presence of carbonate in the plating solution (K-Au) is necessary to raise the pH of the solution. In this condition, pH between 7 and 9, the Au ions have less tendency to reduce and form independent Au clusters in the solution, reducing only over the Au seeds adsorbed on the surface of the silica nanoparticles [51].…”

Section: Chemicalsmentioning

confidence: 99%

Rational design of bimetallic photocatalysts based on plasmonically-derived hot carriers

et al. 2021

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“…Previous experiments have shown a qualitative relationship between the seed density and the shell thickness: a n increase i n seed density produces thinner shells. 10,11 However, a quantitative description of this relationship is not straightforward. The formation of a continuous shell results not only from gold plating, but also from an additional process involving seeds coalescing into a smaller number of particles on the surface in the form of droplets.…”

Section: Introductionmentioning

confidence: 99%

Toward Ultrathin Gold Nanoshells: Exploring Seed Density, Polymer Additives and Microwave Radiation Effects

Lermusiaux¹,

Plissonneau²,

Bertry³

et al. 2021

Preprint

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Nanoshells made of a silica core and a gold shell possess an optical response that is sensitive to nanometre-scale variations in shell thickness. The exponential red shift of the plasmon resonance with decreasing shell thickness makes ultrathin nanoshells (less than 10 nm) particularly interesting for broad and tuneable ranges of optical properties. Nanoshells are generally synthesised by coating gold onto seed-covered silica particles, producing continuous shells with a lower limit of 15 nm, as a result of an inhomogeneous droplet formation on the silica surface during the seed regrowth. In this paper, we investigate the effects of three variations of the synthesis protocol to favour ultrathin nanoshells: seed density, polymer additives and microwave treatment. We first maximised gold seed density around the silica core but surprisingly its effect is limited. However, we found that the addition of polyvinylpyrrolidone during the shell synthesis leads to higher homogeneity and a thinner shell and that a post-synthetic thermal treatment using microwaves can further smooth the particle surface. This study brings new insights into the synthesis of metallic nanoshells, pushing the limits of ultrathin shell synthesis.

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Synthesis of silica-core gold nanoshells and some modifications/variations

Cited by 25 publications

References 82 publications

Gold-seeded Lithium Niobate Nanoparticles: Influence of Gold Surface Coverage on Second Harmonic Properties

Gold-seeded Lithium Niobate Nanoparticles: Influence of Gold Surface Coverage on Second Harmonic Properties

Rational design of bimetallic photocatalysts based on plasmonically-derived hot carriers

Toward Ultrathin Gold Nanoshells: Exploring Seed Density, Polymer Additives and Microwave Radiation Effects

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