Enhanced control of plasmonic properties of silver–gold hollow nanoparticles <i>via</i> a reduction-assisted galvanic replacement approach

Daniel, Josée R.; McCarthy, Lauren A.; Ringe, Emilie; Boudreau, Denis

doi:10.1039/c8ra09364d

Cited by 21 publications

(11 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Also, Krishnan et al converted silver nanoplates to silver–gold nanodisks by galvanic replacement-deposition reactions and, consequently, enormously improved the stability of bimetallic nanodisks . Additionally, lithographic techniques have been used for fabricating hollow metallic nanostructures. , Previously reported approaches for the synthesis of hollow metal nanostructures require (i) special instrumentation, (ii) etching and metal deposition steps, (iii) limited control over the size and geometry of the hollow in the nanostructures, (iv) high temperature, and (vi) reactions involving gold ions and a reducer (e.g., formaldehyde), which make them impractical for many plasmonic applications. In fact, colloidally synthesized and truly circular-shaped nanoring nanostructures with tunable plasmon resonance and plasmonic nanocavities are still lacking.…”

Section: Introductionmentioning

confidence: 99%

Colloidal Bimetallic Nanorings for Strong Plasmon Exciton Coupling

et al. 2020

View full text Add to dashboard Cite

Nobel-metal nanostructures strongly localize and manipulate light at nanoscale dimension by supporting surface plasmon polaritons. In fact, the optical properties of the nobel-metal nanostructures strongly depend on their morphology and composition. Until now, various metal nanostructures such as nanocubes, nanoprisms, nanorods, and recently hollow nanostructures have been demonstrated. In addition, the plasmonic field can be further enhanced at nanoparticle dimers and aggregates because of highly localized and intense optical fields, which is known as "plasmonic hot spots". However, colloidally synthesized and circular-shaped nanoring nanostructures with plasmonic hot spots are still lacking. We, herein, show for the first time that colloidal bimetallic nanorings with plasmonic nanocavities and tunable plasmon resonance wavelengths can be synthesized via colloidal synthesis and galvanic replacement reactions. In addition, in the strong coupling regime, plasmons in nanorings and excitons in J-aggregates interact strongly and nanoring-shaped colloidal plexcitonic nanoparticles are demonstrated. The results reveal that the optical properties of the nanoring and the onset of strong coupling can be tamed by the galvanic replacement reaction. Further, the plasmonic nanocavity in the nanorings has immense potential for applications in sensing and spectroscopy because of the space, enclosed by the plasmonic nanocavity, is empty and accessible to a variety of molecules, ions, and quantum dots.

show abstract

Section: Introductionmentioning

confidence: 99%

Colloidal Bimetallic Nanorings for Strong Plasmon Exciton Coupling

et al. 2020

View full text Add to dashboard Cite

show abstract

“…[36][37][38][39][40][41][42] This is a mature approach for AgAu hollow systems, where the extent of galvanic replacement and alloying can be controlled by not only stoichiometry, but also the addition of reducing agents. 43 Here, we show that stoichiometry-controlled partial galvanic replacement leads to the tunable decoration of well defined, crystalline, Mg NPs with Au, Ag, Pd and Fe. Composition mapping and elemental analyses confirm the galvanic replacement mechanism, and advanced electron microscopy techniques and single-particle scattering measurements further unravel the bimetallic and plasmonic nature of the particles.…”

Section: Introductionmentioning

confidence: 75%

“…An obvious candidate for a galvanic replacement reaction is Au, given its noble character, resistance to oxidation, well characterized plasmonic properties, and abundant previous reports of reaction with Ag. 38,40,41,43 There is not a straightforward analogy between Au/Ag and Au/Mg. Indeed, whereas Ag and Au have similar fcc crystal lattices, Mg crystallizes in a hcp structure.…”

Section: B Au-decorated Mg Nanoparticlesmentioning

confidence: 99%

Decoration of plasmonic Mg nanoparticles by partial galvanic replacement

Asselin

Boukouvala

et al. 2019

The Journal of Chemical Physics

Self Cite

View full text Add to dashboard Cite

show abstract

“…Another key difference is that the GR reported here is nonaqueous, while that reported for Al is performed in concentrated aqueous NH 4 Cl. This affects both the metal precursor speciation via pH control, 112 and the Al template's reactivity by inhibiting hydroxide formation. These initial results on the replacement of plasmonic Al and Mg NPs pave the way for an exciting array of synthetic approaches for bimetallic NPs.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Shapes, Plasmonic Properties, and Reactivity of Magnesium Nanoparticles

Ringe

2020

J. Phys. Chem. C

Self Cite

View full text Add to dashboard Cite

Localized surface plasmon resonances have attracted much attention due to their ability to enhance light–matter interactions and manipulate light at the subwavelength level. Recently, alternatives to the rare and expensive noble metals Ag and Au have been sought for more sustainable and large-scale plasmonic utilization. Mg supports plasmon resonances, is one of the most abundant elements in earth’s crust, and is fully biocompatible, making it an attractive framework for plasmonics. This feature article first reports the hexagonal, folded, and kite-like shapes expected theoretically from a modified Wulff construction for single crystal and twinned Mg structures and describes their excellent match with experimental results. Then, the optical response of Mg nanoparticles is overviewed, highlighting Mg’s ability to sustain localized surface plasmon resonances across the ultraviolet, visible, and near-infrared electromagnetic ranges. The various resonant modes of hexagons, leading to the highly localized electric field characteristic of plasmonic behavior, are presented numerically and experimentally. The evolution of these modes and the associated field from hexagons to the lower symmetry folded structures is then probed, again by matching simulations, optical, and electron spectroscopy data. Lastly, results demonstrating the opportunities and challenges related to the high chemical reactivity of Mg are discussed, including surface oxide formation and galvanic replacement as a synthetic tool for bimetallics. This Feature Article concludes with a summary of the next steps, open questions, and future directions in the field of Mg nanoplasmonics.

show abstract

Enhanced control of plasmonic properties of silver–gold hollow nanoparticles via a reduction-assisted galvanic replacement approach

Abstract: A co-reduction assisted method for the synthesis of Ag–Au hollow nanoparticles with enhanced control over plasmon wavelength and scattering intensity.

Cited by 21 publications

References 54 publications

Colloidal Bimetallic Nanorings for Strong Plasmon Exciton Coupling

Colloidal Bimetallic Nanorings for Strong Plasmon Exciton Coupling

Decoration of plasmonic Mg nanoparticles by partial galvanic replacement

Shapes, Plasmonic Properties, and Reactivity of Magnesium Nanoparticles

Contact Info

Product

Resources

About