Plasmon and compositional mapping of plasmonic nanostructures

Ringe, Emilie; Collins, Sean M.; DeSantis, Christopher J.; Skrabalak, Sara E.; Midgley, Paul A.

doi:10.1117/12.2073886

Cited by 4 publications

(4 citation statements)

References 48 publications

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“…For the representative 166 nm diameter Al nanocrystal studied here, three prominent LSPR modes were found: the lowest energy at 3.3 eV and intermediate energy modes at 5.5 and 7.1 eV (Figure b). Plasmon maps (Figure c) were generated from plotting the contribution of each resonant mode at each pixel for the modes (Figure b) extracted from the STEM-EELS data cube with non-negative matrix functionalization (performed in HYPERSPY). , These maps consistently display 3-fold symmetry, corroborating the CL results. The field intensity for the lowest energy dipolar 3.3 eV plasmon mode (Figure c, top) is strongly localized at the tips of the particle, similar to the lower energy modes of a nanocube. , The 5.5 eV mode (Figure c, center) is a quadrupolar LSPR with field intensity localized at the faces of the structure; analogies can again be made with the face mode of a nanocube .…”

supporting

confidence: 58%

Aluminum Nanocrystals

McClain¹,

Schlather²,

Ringe³

et al. 2015

Nano Lett.

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241

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Abstract:We demonstrate the facile synthesis of high purity aluminum nanocrystals over a range of controlled sizes from 70 nm to 220 nm diameter, with size control achieved through a simple modification of solvent ratios in the reaction solution. The monodisperse, icosahedral and trigonal bipyramidal nanocrystals are air-stable for weeks, due to the formation of a 2-4 nm thick passivating oxide layer on their surfaces. We show that the nanocrystals support sizedependent ultraviolet and visible plasmon modes, providing a far more sustainable alternative to gold and silver nanoparticles currently in widespread use.

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supporting

confidence: 58%

Aluminum Nanocrystals

McClain¹,

Schlather²,

Ringe³

et al. 2015

Nano Lett.

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186

241

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“…The multidimensional data array (164 × 164 pixels region of interest, 2048 energy channels, 3 tilts for the particle in Figs 2a - 3 , Supplementary Fig. 7 ) was analyzed using blind source separation of decomposed modes from non-negative matrix factorization performed in HYPERSPY 24 39 47 . This approach decomposes the intrinsically redundant information of a spectrum image (SI) into a number of spectral components (spectral factors) that are multiplied by different coefficients (loadings) at each pixel to best fit the SI.…”

Section: Methodsmentioning

confidence: 99%

Resonances of nanoparticles with poor plasmonic metal tips

Ringe

DeSantis

Collins

et al. 2015

Sci Rep

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The catalytic and optical properties of metal nanoparticles can be combined to create platforms for light-driven chemical energy storage and enhanced in-situ reaction monitoring. However, the heavily damped plasmon resonances of many catalytically active metals (e.g. Pt, Pd) prevent this dual functionality in pure nanostructures. The addition of catalytic metals at the surface of efficient plasmonic particles thus presents a unique opportunity if the resonances can be conserved after coating. Here, nanometer resolution electron-based techniques (electron energy loss, cathodoluminescence, and energy dispersive X-ray spectroscopy) are used to show that Au particles incorporating a catalytically active but heavily damped metal, Pd, sustain multiple size-dependent localized surface plasmon resonances (LSPRs) that are narrow and strongly localized at the Pd-rich tips. The resonances also couple with a dielectric substrate and other nanoparticles, establishing that the full range of plasmonic behavior is observed in these multifunctional nanostructures despite the presence of Pd.

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“…Indeed, recent studies of alloy plasmons illustrate the potential contributions of EELS characterization. ,,,− Ringe et al investigated Au–Pd octopods, suggesting that Au alloys containing a poor plasmonic metal (Pd) can still sustain localized LSPRs. Tran et al examined nonuniform Au–Pd nanoparticles obtained from a microbial synthesis and observed a significant difference when placing the electron beam at Au-rich and Pd-rich regions within a single nanoparticle.…”

Section: Probing Surface Plasmons With Stem/eelsmentioning

confidence: 99%

Probing Nanoparticle Plasmons with Electron Energy Loss Spectroscopy

2017

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Electron energy loss spectroscopy (EELS) performed in a scanning transmission electron microscope (STEM) has demonstrated unprecedented power in the characterization of surface plasmons. The subangstrom spatial resolution achieved in EELS and its capability of exciting the full set of localized surface plasmon resonance (LSPR) modes supported by a metallic nanostructure makes STEM/EELS an ideal tool in the study of LSPRs. The plasmonic properties characterized using EELS can be associated with geometric or structural features collected simultaneously in a STEM to achieve a deeper understanding of the plasmonic response. In this review, we provide the reader a thorough experimental description of EELS as a LSPR characterization tool and summarize the exciting recent progress in the field of STEM/EELS plasmon characterization.

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Plasmon and compositional mapping of plasmonic nanostructures

Cited by 4 publications

References 48 publications

Aluminum Nanocrystals

Aluminum Nanocrystals

Resonances of nanoparticles with poor plasmonic metal tips

Probing Nanoparticle Plasmons with Electron Energy Loss Spectroscopy

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