The Substrate Effect in Electron Energy-Loss Spectroscopy of Localized Surface Plasmons in Gold and Silver Nanoparticles

Kadkhodazadeh, Shima; Christensen, Thomas; Beleggia, Marco; Mortensen, N. Asger; Wagner, Jakob Birkedal

doi:10.1021/acsphotonics.6b00489

Cited by 24 publications

(41 citation statements)

References 62 publications

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“…Figure b,c displays the energy maps of the two plasmon resonances observed in the Ga NPs (Figure a), i.e., the gallium bulk plasmon energy resonance (Figure b) and the LSPR (Figure c), centered at 13.76 and 4.12 eV, respectively, as seen in the extracted LL‐EELS signals (Figure d). It is widely known that many factors influence the energy resonance of the LSP in nanostructures, playing a crucial role, among others, the shape, size, and environment of the studied systems . As a common trend, the nanoparticle shrinking blueshifts the LSPR, while shape effects may lead to anisotropic properties (elongated structures), observation of higher order (HO) plasmonic modes or plasmon hybridization (when dealing with hollow systems or cavities) .…”

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confidence: 99%

High Spatial Resolution Mapping of Localized Surface Plasmon Resonances in Single Gallium Nanoparticles

Mata

Catalán‐Gómez

Nucciarelli

et al. 2019

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materials, as certain semiconductor systems, [6] have been demonstrated to show plasmonic behavior, where the plasmon resonance is achieved by the excitation of interband transitions. [7] Among metals, noble metals as gold and silver have been the most extensively studied and exploited plasmonic systems, whose response lies on the VIS-IR spectral region. However, expanding the operability range up to the UV region is highly desirable to cover further applications, [8] which requires exploring alternative plasmonic materials.Within this context, few material systems optically active at the UV, as Mg, Al, or Ga are currently catching the attention of many research groups. [9,10] The ability to obtain these materials as colloidal suspensions offers a further advantage since it allows for their easy and cheap synthesis as nanostructures. Aluminum is an attractive choice as UV plasmonic material due to its bulk plasma frequency (15 eV) and earth abundance. [11] The strong interband transitions in Al, at about 1.5 eV, damp the possible resonances at that spectral range (NIR), while the material can support LSPR below and above that region. The short wavelengths of Al resonances (typically, 150-250 nm) become comparable to the nanoparticle (NP) size, leading to the emergence of higher order LSPRs. Regarding the spectral shape, the large linewidth of Al resonances as compared to noble metals can be understood through the modified long wavelength approximation, where the radiative damping scales with the cubed oscillation frequency (ω 3 ). [12] Although much less studied until date, Mg also shows UV plasmon resonances as consequence of its bulk plasma frequency, supporting IR resonances, too, in contrast to Al. Up to three different LSPR modes have been reported for Mg hexagonal nanoplates. [9] Another alternative UV plasmonic material is gallium (Ga), having a high bulk plasmon energy, at 14 eV; [13] exhibiting strong UV LSPR due to its negative real part of the electric function along with its low imaginary part of the dielectric function. Simple synthetic procedures allow obtaining gallium nanoparticles (Ga NPs) in a cost effective way such as thermal evaporation. The plasmonic response of the synthesized Ga NPs can be tuned, for instance, as function of their size and shape. [14][15][16] Thus, Ga NPs are among the ideal candidates to spread the application range of plasmonic systems suitable, for instance, for DNA sensing. [17] Plasmonics has emerged as an attractive field driving the development of optical systems in order to control and exploit light-matter interactions. The increasing interest around plasmonic systems is pushing the research of alternative plasmonic materials, spreading the operability range from IR to UV. Within this context, gallium appears as an ideal candidate, potentially active within a broad spectral range (UV-VIS-IR), whose optical properties are scarcely reported. Importantly, the smart design of active plasmonic materials requires their characterization at high spatial and spectral resolu...

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confidence: 99%

High Spatial Resolution Mapping of Localized Surface Plasmon Resonances in Single Gallium Nanoparticles

Mata

Catalán‐Gómez

Nucciarelli

et al. 2019

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“…13 The presence of such intermediate states influences the dielectric properties of the surrounding medium and impacts the gold plasmon resonance energy and strength. [14][15][16] Therefore, it is very important to characterize and understand Au nanoparticle/Si nanocomposites on the nanometer scale, in order to be able to tune the surface plasmons of gold nanoparticles in such devices.…”

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Nanoscale-Induced Formation of Silicide around Gold Nanoparticles Encapsulated in a-Si

et al. 2020

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Decorating thin film solar cells with plasmonic nanoparticles is being pursued, in order to improve device efficiency through increased scattering and local field enhancement. Gold nanoparticles are in particular interesting, due to their chemical inertness and plasmon resonance in the visible range of the spectrum.In this work, gold nanoparticles fabricated by a gas aggregation nanoparticle source and embedded in a-Si (a commercial solar cell material) are studied using x-ray photo-electron spectroscopy, transmission electron microscopy, electron energy-loss spectroscopy and energy dispersive X-ray spectroscopy. The formation of gold silicide around the nanoparticles is investigated, as it has important consequences for the optical and electronic properties of the structures. Differently from previous studies, in which the silicide formation is observed for gold nanoparticles and thin films grown on top of crystalline silicon or silica, it is found that silicide formation is largely enhanced around the nanoparticles, owing to their increased surface/volume ratio. A detailed gold silicide formation mechanism is presented based on the results, and strategies for optimizing the design of plasmonically enhanced solar cells with gold nanoparticles encapsulated in a-Si are discussed.

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“…LSPR is generated by the interaction between incident light and collective oscillation of the free electrons on the surface of nanoparticles and has the property that can be observed in the wavelength of the visible region 13 . LSPR depends on the material 14,15 , shape 16 , size 17 , and dielectric environment 18,19 of the noble metal nanoparticles. So it is possible to analyze the interaction of biomolecules on the particles surface by observing the changes of the LSPR intensity 20 , wavelength 21 , and phase 22 depending on the refractive index of the dielectric medium at the metal-dielectric interface.…”

Section: Introductionmentioning

confidence: 99%

Fiber optic sensor based on ZnO nanowires decorated by Au nanoparticles for improved plasmonic biosensor

Kim

Park

Lee

2019

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Fiber-optic-based localized surface plasmon resonance (FO-LSPR) sensors with three-dimensional (3D) nanostructures have been developed. These sensors were fabricated using zinc oxide (ZnO) nanowires and gold nanoparticles (AuNPs) for highly sensitive plasmonic biosensing. The main achievements in the development of the biosensors include: (1) an extended sensing area, (2) light trapping effect by nanowires, and (3) a simple optical system based on an optical fiber. The 3D nanostructure was fabricated by growing the ZnO nanowires on the cross-section of optical fibers using hydrothermal synthesis and via immobilization of AuNPs on the nanowires. The proposed sensor outputted a linear response according to refractive index changes. The 3D FO-LSPR sensor exhibited an enhanced localized surface plasmon resonance response of 171% for bulk refractive index changes when compared to the two-dimensional (2D) FO-LSPR sensors where the AuNPs are fixed on optical fiber as a monolayer. In addition, the prostate-specific antigen known as a useful biomarker to diagnose prostate cancer was measured with various concentrations in 2D and 3D FO-LSPR sensors, and the limits of detection (LODs) were 2.06 and 0.51 pg/ml, respectively. When compared to the 2D nanostructure, the LOD of the sensor with 3D nanostructure was increased by 404%.

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The Substrate Effect in Electron Energy-Loss Spectroscopy of Localized Surface Plasmons in Gold and Silver Nanoparticles

Cited by 24 publications

References 62 publications

High Spatial Resolution Mapping of Localized Surface Plasmon Resonances in Single Gallium Nanoparticles

High Spatial Resolution Mapping of Localized Surface Plasmon Resonances in Single Gallium Nanoparticles

Nanoscale-Induced Formation of Silicide around Gold Nanoparticles Encapsulated in a-Si

Fiber optic sensor based on ZnO nanowires decorated by Au nanoparticles for improved plasmonic biosensor

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