Branched Plasmonic Nanoparticles with High Symmetry

Smith, Joshua D.; Woessner, Zachary J.; Skrabalak, Sara E.

doi:10.1021/acs.jpcc.9b01703

Cited by 19 publications

(29 citation statements)

References 99 publications

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“…This anisotropic growth results in a longitudinal resonance that occurs from tips on opposite C 5 axes and a transverse resonance that occurs between the branches on the same C 5 axis. The absence of a shoulder for k ‐ C 5 spectra in Figure a further supports the assignment of the two LSPR resonances since the excitation of the transverse LSPR is impossible . The peak at 556–587 nm is attributed to the resonance along the equatorial plane .…”

Section: Resultssupporting

confidence: 62%

“…When considering the near‐field behavior of the branched decahedron, areas of strong EF enhancements are found at the tips (Figure e–j). The increased EF intensity localized at the tips (Figure e–j) is expected . Tip‐localized EF enhancement is also observed for the branched pentatwinned rod (Figure S14) and branched icosahedron (Figure S15).…”

Section: Resultssupporting

confidence: 55%

“…The far‐field (Figure a) and near‐field (Figure e–j) plasmonic behavior was analyzed by changing the light's injection axis, k , along the C 2 and C 5 rotational axis of the branched decahedron (Figure S16) . Figure reveals that the branched decahedron displays three major LSPR peaks: a longitudinal LSPR between 861–882 nm, a transverse LSPR at 809 nm, and an equatorial LSPR between 556–587 nm.…”

Section: Resultsmentioning

confidence: 99%

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Defect‐Directed Growth of Symmetrically Branched Metal Nanocrystals

et al. 2019

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Branched plasmonic nanocrystals (NCs) have attracted much attention due to electric field enhancements at their tips. Seeded growth provides routes to NCs with defined branching patterns and, in turn, near‐field distributions with defined symmetries. Here, a systematic analysis was undertaken in which seeds containing different distributions of planar defects were used to grow branched NCs in order to understand how their distributions direct the branching. Characterization of the products by multimode electron tomography and analysis of the NC morphologies at different overgrowth stages indicate that the branching patterns are directed by the seed defects, with the emergence of branches from the seed faces consistent with minimizing volumetric strain energy at the expense of surface energy. These results contrast with growth of branched NCs from single‐crystalline seeds and provide a new platform for the synthesis of symmetrically branched plasmonic NCs.

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Section: Resultssupporting

confidence: 62%

Section: Resultssupporting

confidence: 55%

Section: Resultsmentioning

confidence: 99%

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Defect‐Directed Growth of Symmetrically Branched Metal Nanocrystals

et al. 2019

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“…[ 38 ] As this oscillation is confined by the nanoparticle, the light scattering and absorption behavior can be designed by particle size and shape and provide a myriad of observed colors by optical dark‐field scattering microscopy analysis of PUFs. [ 39–41 ]…”

Section: Design and Encoding Principles Of Plasmonic Nanoparticlesmentioning

confidence: 99%

Designer Plasmonic Nanostructures for Unclonable Anticounterfeit Tags

Ibrar

Skrabalak

2021

Small Structures

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Counterfeit goods are pervasive in many sectors of our economy, necessitating development of authentication strategies that enhance security of goods and prevent against economic losses. Unique images and barcodes have proven useful but are susceptible to duplication. In contrast, intrinsically random features can be difficult to replicate and represent an alternative if their encoding capacity (EC) is sufficiently high and their analysis facile. Herein, the creation of such anticounterfeit tags with designer plasmonic nanostructures—those whose optical properties are precisely controlled by nanostructure size and shape—as one promising authentication strategy and also reflects on the metrics that define EC as there is a shift toward covert anticounterfeit tags is discussed.

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“…For the controlled preparations of Ag–Au bimetallic NCs, various technologies (seed-mediated growth, soft template, thermo-decomposition, and etching) have been demonstrated to be effective. 18 − 25 Of them, etching is a very powerful tool to tune the morphology, composition, and structure of NCs. For example, galvanic etching can be used to synthesize diverse hollow nanostructures.…”

Section: Introductionmentioning

confidence: 99%

Effects of Strain and Kinetics on the H₂O₂-Assisted Reconstruction of Ag–Au–Ag Nanorods

et al. 2020

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Morphology of Ag nanocrystals (NCs) is essential to the NC application in catalysis, optics, and as antibacterial agents. Therefore, it is important to develop synthetic methods and understand the evaluation of NC morphology in different chemical environments. In this study, we report interesting findings of the morphological change of fivefold-twinned Ag–Au–Ag nanorods (NRs) under the effect of H 2 O 2 both as an oxidant (etchant) and a reductant. At low H 2 O 2 concentration, the reconstruction of Ag–Au–Ag NRs was dominated by the growth along the longitudinal direction of NRs. With the increase of H 2 O 2 concentration, the reconstruction also occurs in the transverse direction, and a clear change in particle morphology was observed. We further systematically studied the mechanism of the reaction. The results showed that the transition of the morphology was a two-step process: (1) the etching of Ag on the seeds and (2) the reduction of Ag 2 O. In the second step, the reaction kinetics was highly affected by H 2 O 2 concentration. At low H 2 O 2 concentration, the growth mainly occurs along ⟨110⟩. However, at high H 2 O 2 concentration, the reduction of Ag was not facet-selective. Using the developed method, we can prepare various bimetallic NCs (high aspect ratio NRs with abundant pinholes, nanoplates, and other NCs). The effect of the reconstruction process on the surface-enhanced Raman scattering (SERS) performance of NCs was investigated.

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Branched Plasmonic Nanoparticles with High Symmetry

Cited by 19 publications

References 99 publications

Defect‐Directed Growth of Symmetrically Branched Metal Nanocrystals

Defect‐Directed Growth of Symmetrically Branched Metal Nanocrystals

Designer Plasmonic Nanostructures for Unclonable Anticounterfeit Tags

Effects of Strain and Kinetics on the H₂O₂-Assisted Reconstruction of Ag–Au–Ag Nanorods

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Branched Plasmonic Nanoparticles with High Symmetry

Cited by 19 publications

References 99 publications

Defect‐Directed Growth of Symmetrically Branched Metal Nanocrystals

Defect‐Directed Growth of Symmetrically Branched Metal Nanocrystals

Designer Plasmonic Nanostructures for Unclonable Anticounterfeit Tags

Effects of Strain and Kinetics on the H2O2-Assisted Reconstruction of Ag–Au–Ag Nanorods

Contact Info

Product

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Effects of Strain and Kinetics on the H₂O₂-Assisted Reconstruction of Ag–Au–Ag Nanorods