Study of sodium metal plasmon using electron energy loss spectroscopy

Yang, Shize; Crozier, Peter A.

doi:10.1017/s1431927621002634

Cited by 2 publications

(1 citation statement)

References 5 publications

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“…Plasmons arising on the surface of metallic nanostructures have allowed manipulation and enhancement of the typical molecular vibrations characteristic of the molecules adsorbed to their surfaces that are to be analyzed. Various groups have explored this plasmonic property and exploited its uses toward the molecular detection of analytes through the phenomenon termed surface-enhanced Raman scattering (SERS), especially through the use of heterometallic nanoparticles, with many of the nanoparticles proving to be much-needed additions to medical imaging and general molecular detection methods. − However, this plasmonic resonance has only been shown to arise in nonferromagnetic metals as well as more reactive alkali and alkaline-earth metal nanostructures. − This is due to Fe and Co’s real component of permittivity being positive, meaning they have weak interaction with incident light that do not allow the generation of surface plasmons, thereby dampening any possible surface plasmon resonance polaritons (SPP) at their metal/dielectric interface. Specifically, a new method of detection has arisen from the hybridized resonance pattern that occurs because of alloying FeCo with a noble metal to create ferroplasmonic nanostructures. , Lopez-Ortega et al have reported the magneto-optical enhancement in metallic Ag/FeCo core/shell nanoparticles with 50 emu/g magnetization .…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Magnetoplasmonic Air-Stable Au@FeCo

et al. 2023

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The synthesis of FeCo alloys as highly magnetic nanoparticles has been valuable, as far as applications for magnetic nanoparticles are concerned. However, recently, a field of magnetoplasmonics in which magnetic nanoparticles such as the FeCo alloys doped with plasmonic materials such as Au and Ag to create a hybrid nanostructure with both properties has emerged. These magnetoplasmonic metamaterials have greatly enhanced the limit of detection of analytes in spectroscopic methods, as well as providing a more widely applicable nanoparticle to broaden the use of FeCo alloys even further. Herein, we discuss the synthesis of high-yield and fairly monodisperse spherical FeCo and Au-doped FeCo (Au@FeCo) with varying compositions of Au synthesized via the thermal decomposition of iron pentacarbonyl (Fe(CO) 5 ) and dicobalt octacarbonyl (Co 2 (CO) 8 ), followed by the addition of Au atoms using triphenylphosphine gold(I) chloride ((Ph 3 P)AuCl) via both coprecipitation and by delayed addition methods. The products were separated using a hand-held magnet, and then characterized via ultraviolet−visible light (UV-vis), scanning electron microscopy coupled with energy-dispersive X-ray analysis (SEM-EDX), high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), flame atomic absorption spectrometry (F-AAS), and magnetization measurements. Optical studies revealed a plasmonic peak at 550 nm in the Au@FeCo nanoparticles that had a gold content (%Au) of >2% (by weight), determined using F-AAS. Colocation of the Fe, Co, and Au were demonstrated through EDX analysis. Location of the Au atoms in the core were seen through high-resolution bright-field imaging. To understand the use of these nanoparticles for potential application in therapeutics and/or electronics, resistance measurements were performed to assess power loss as a function of frequency. We also achieved magnetization values as high as 150 emu/g and as low as 50 emu/g for gold-loaded samples based on % Au by weight. This paves the way to continue to develop magneto-plasmonic structures chemically using these synthesis strategies.

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Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Magnetoplasmonic Air-Stable Au@FeCo

et al. 2023

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Advances in ultrahigh-energy resolution EELS: phonons, infrared plasmons and strongly coupled modes

Lagos

Bicket

et al. 2022

Microscopy

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Nowadays, sub-50 meV atom-wide electron probes are routinely produced for electron energy loss spectroscopy in transmission electron microscopes due to monochromator technology advances. We review how gradual improvements in energy resolution enabled the study of very low-energy excitations such as lattice phonons, molecular vibrations, infrared plasmons and strongly coupled hybrid modes in nanomaterials. Starting with the theoretical framework needed to treat inelastic electron scattering from phonons in solids, we illustrate contributions in detecting optical surface phonons in photonic structures. We discuss phonon mapping capabilities in real and reciprocal space, and the localized phonon response near nano-/atomic-scale structural features. We also survey the progress of aloof spectroscopy in studying vibrations in organic materials and applications in measuring local temperature and photonic density of states in single nanostructures using phonon scattering. We then turn towards studies on infrared plasmons in metals and semiconductors. Spectroscopy analyses now extend towards probing extremely complex broadband platforms, the effects of defects and nanogaps, and some far-reaching investigations towards uncovering plasmon lifetime and 3D photonic density of states. In doped semiconductors, we review research on the use of the electron probe to correlate local doping concentration and atomic-scale defects with the plasmonic response. Finally, we discuss advances in studying strong coupling phenomena in plasmon–exciton and plasmon–phonon systems. Overall, the wealth of information gained extends our knowledge about nanomaterial properties and elementary excitations, illustrating the powerful capabilities of high-energy resolution scanning transmission electron microscopy–electron energy loss spectrometry.

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Study of sodium metal plasmon using electron energy loss spectroscopy

Cited by 2 publications

References 5 publications

Synthesis and Characterization of Magnetoplasmonic Air-Stable Au@FeCo

Synthesis and Characterization of Magnetoplasmonic Air-Stable Au@FeCo

Advances in ultrahigh-energy resolution EELS: phonons, infrared plasmons and strongly coupled modes

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