Optical Properties of Au−Ag Nanoboxes Studied by Single Nanoparticle Spectroscopy

Hu, Min; Petrova, Hristina; Sekkinen, Andrew R.; Chen, Jingyi; McLellan, Joseph M.; Li, Zhi Yuan; Márquez, Manuel; Li, Xingde; Xia, Younan; Hartland, Gregory V.

doi:10.1021/jp0621068

Cited by 86 publications

(131 citation statements)

References 31 publications

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“…31,34 As the size of the particles increases, coupling of the LSPR oscillation to the radiation field can become an important energy loss mechanism. 20,22,[32][33][34]46 This effect is known as radiation damping, and is not included in the above analysis. For spherical particles, radiation damping can be accounted for by using the full Mie theory expression to calculate the scattering cross-sections.…”

Section: Dephasing Processes In Metal Nanoparticlesmentioning

confidence: 99%

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Dark-field microscopy studies of single metal nanoparticles: understanding the factors that influence the linewidth of the localized surface plasmon resonance

et al. 2008

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This article provides a review of our recent Rayleigh scattering measurements on single metal nanoparticles. Two different systems will be discussed in detail: gold nanorods with lengths between 30 and 80 nm, and widths between 8 and 30 nm; and hollow gold-silver nanocubes (termed nanoboxes or nanocages depending on their exact morphology) with edge lengths between 100 and 160 nm, and wall thicknesses of the order of 10 nm. The goal of this work is to understand how the linewidth of the localized surface plasmon resonance depends on the size, shape, and environment of the nanoparticles. Specifically, the relative contributions from bulk dephasing, electron-surface scattering, and radiation damping (energy loss via coupling to the radiation field) have been determined by examining particles with different dimensions. This separation is possible because the magnitude of the radiation damping effect is proportional to the particle volume, whereas, the electron-surface scattering contribution is inversely proportional to the dimensions. For the nanorods, radiation damping is the dominant effect for thick rods (widths greater than 20 nm), while electron-surface scattering is dominant for thin rods (widths less than 10 nm). Rods with widths in between these limits have narrow resonances-approaching the value determined by the bulk contribution. For nanoboxes and nanocages, both radiation damping and electron-surface scattering are significant at all sizes. This is because these materials have thin walls, but large edge lengths and, therefore, relatively large volumes. The effect of the environment on the localized surface plasmon resonance has also been studied for nanoboxes. Increasing the dielectric constant of the surroundings causes a red-shift and an increase in the linewidth of the plasmon band. The increase in linewidth is attributed to enhanced radiation damping.

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Section: Dephasing Processes In Metal Nanoparticlesmentioning

confidence: 99%

“…33,34,46 For the nanorods, electron-surface scattering is the dominant effect for narrow rods (widths < 10 nm), and radiation damping dominates for thick rods (widths > 20 nm). 33 Rods with "in between" thicknesses have narrow resonances, which are essentially free from either radiation damping or electron-surface scattering effects.…”

Section: Introductionmentioning

confidence: 99%

Dark-field microscopy studies of single metal nanoparticles: understanding the factors that influence the linewidth of the localized surface plasmon resonance

et al. 2008

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“…Hu et al conducted the first studies on the optical properties of individual hollow nanoparticles consisting of AuAg nanoboxes and nanocages by using Rayleigh scattering spectroscopy in a dark field microscope which was correlated with a SEM [124,125]. Figure 5 shows the Rayleigh scattering spectra and SEM images of several AuAg nanocages as studied by Hu et al [125] where {100} facets of the nanocages in Figure 5A,B and {111} facets of the nanocages in Figure 5C,D are in contact with the substrate.…”

Section: Ultralocal Plasmonic Propertiesmentioning

confidence: 99%

Hollow metal nanostructures for enhanced plasmonics: synthesis, local plasmonic properties and applications

et al. 2016

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Metallic nanostructures have received great attention due to their ability to generate surface plasmon resonances, which are collective oscillations of conduction electrons of a material excited by an electromagnetic wave. Plasmonic metal nanostructures are able to localize and manipulate the light at the nanoscale and, therefore, are attractive building blocks for various emerging applications. In particular, hollow nanostructures are promising plasmonic materials as cavities are known to have better plasmonic properties than their solid counterparts thanks to the plasmon hybridization mechanism. The hybridization of the plasmons results in the enhancement of the plasmon fields along with more homogeneous distribution as well as the reduction of localized surface plasmon resonance (LSPR) quenching due to absorption. In this review, we summarize the efforts on the synthesis of hollow metal nanostructures with an emphasis on the galvanic replacement reaction. In the second part of this review, we discuss the advancements on the characterization of plasmonic properties of hollow nanostructures, covering the single nanoparticle experiments, nanoscale characterization via electron energy-loss spectroscopy and modeling and simulation studies. Examples of the applications, i.e. sensing, surface enhanced Raman spectroscopy, photothermal ablation therapy of cancer, drug delivery or catalysis among others, where hollow nanostructures perform better than their solid counterparts, are also evaluated.

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“…The size data of length and thickness of Ag NPs P1-P4 and TNBs B1-B4 (cavity and outer) measured from several TEM images by averaging. from core-shell structure formation as well as an increase in the Au/Ag ratio and particle volume, which have been demonstrated in AuAg alloyed nanospheres [24], nanocages [25], and nanoframes [26]. As the volume of TNBs increases, the red shift value decreases.…”

Section: Synthesis and Characterization Of Auag Alloyed Tnbsmentioning

confidence: 92%

Surface Plasmon Properties of Hollow Auag Alloyed Triangular Nanoboxes and Its Applications in Sers Imaging and Potential Drug Delivery

Liu¹,

Lin²,

Jiang³

et al. 2012

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Abstract-We successfully synthesized hollow AuAg alloyed triangular nanoboxes (TNBs) with localized surface plasmon resonances (LSPR) spectra position from visible to NIR region. We then study the surface plasmon properties of AuAg alloyed TNBs and explore their application in surface enhanced Raman scattering (SERS) imaging. We also investigated the laser induced near-field ablation of TNBs, which have the potentials of drug delivery for cancer treatment. Finite Difference Time Domain (FDTD) method is used to calculate electromagnetic fields induced by optical excitation of LSPR of AuAg alloyed TNBs for the first time. The calculated results are proved through in-vivo SERS imaging by three types of SERS tags based on TNBs. Furthermore, the unique hollow structure of TNBs may facilitate direct encapsulation of anticancer drugs, without any surface coatings. The femtosecond laser near-field ablation experiment is studied as one possible method to release the drug encapsulated inside the hollow structure. These studies show that the nanostructures are easy to break down and promising as a nanodevice model for controlled drug delivery.

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Optical Properties of Au−Ag Nanoboxes Studied by Single Nanoparticle Spectroscopy

Cited by 86 publications

References 31 publications

Dark-field microscopy studies of single metal nanoparticles: understanding the factors that influence the linewidth of the localized surface plasmon resonance

Dark-field microscopy studies of single metal nanoparticles: understanding the factors that influence the linewidth of the localized surface plasmon resonance

Hollow metal nanostructures for enhanced plasmonics: synthesis, local plasmonic properties and applications

Surface Plasmon Properties of Hollow Auag Alloyed Triangular Nanoboxes and Its Applications in Sers Imaging and Potential Drug Delivery

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