Synthesis and Optical Properties of Gold Nanodecahedra with Size Control

Sánchez‐Iglesias, Ana; Pastoriza‐Santos, Isabel; Pérez‐Juste, Jorge; Rodríguez‐González, Benito; Abajo, F. Javier García de; Liz‐Marzán, Luis M.

doi:10.1002/adma.200600475

Cited by 354 publications

(278 citation statements)

References 40 publications

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“…40 This result is in contrast to ensemble extinction measurements of particles in solution using standard transmission vis-NIR spectroscopy, which reveal the presence of both modes A and B. 41,42 Incidentally, we attribute the redshift of the experimental feature A with respect to the numerical calculation to the presence of the PMMA supporting layer (refractive index n = 1.5), which is not included in the simulation, although other effects such as surface roughness and uncertainties in morphological details could play a role as well. In the calculated induced electric near-field intensity distributions of the azimuthal and polar plasmon modes (Figure 1c,d), large field enhancement is observed at the pentagonal base corners and edges for the azimuthal mode A, under circularly polarized light incidence (over 10 3 times larger than the incident intensity) and at the tips of the decahedron for the polar mode B (over 10 2 intensity enhancement).…”

mentioning

confidence: 69%

Plasmon Spectroscopy and Imaging of Individual Gold Nanodecahedra: A Combined Optical Microscopy, Cathodoluminescence, and Electron Energy-Loss Spectroscopy Study

Myroshnychenko¹,

et al. 2012

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Imaging localized plasmon modes in noblemetal nanoparticles is of fundamental importance for applications such as ultrasensitive molecular detection. Here, we demonstrate the combined use of optical dark-field microscopy (DFM), cathodoluminescence (CL), and electron energy-loss spectroscopy (EELS) to study localized surface plasmons on individual gold nanodecahedra. By exciting surface plasmons with either external light or an electron beam, we experimentally resolve a prominent dipole-active plasmon band in the far-field radiation acquired via DFM and CL, whereas EELS reveals an additional plasmon mode associated with a weak dipole moment. We present measured spectra and intensity maps of plasmon modes in individual nanodecahedra in excellent agreement with boundary-element method simulations, including the effect of the substrate. A simple tight-binding model is formulated to successfully explain the rich plasmon structure in these particles encompasing bright and dark modes, which we predict to be fully observable in less lossy silver decahedra. Our work provides useful insight into the complex nature of plasmon resonances in nanoparticles with pentagonal symmetry. KEYWORDS: Localized plasmons, gold nanodecahedra, dark-field microscopy and spectroscopy, cathodoluminescence spectral imaging, electron energy-loss spectroscopy, boundary-element method L ight-matter interaction at the nanoscale has attracted much attention during the past decade because of its scientific and practical relevance. In particular, an impressive amount of work on metal nanoparticles has been triggered by their ability to host localized surface plasmons (SPs), which are quantized collective oscillations of conduction electrons mediated by their coulomb interaction. 1 These excitations can be tailored over a broad spectral range by controlling the size, morphology, and composition of the particles. 1−5 In particular, plasmons in noble metal nanocrystals oscillate at frequencies within the visible and near-infrared (vis-NIR), that is, the spectral ranges of interest for optical engineering, spectroscopy, and microscopy. Actually, SPs couple efficiently to external electromagnetic radiation, 6,7 thus offering a convenient way of concentrating and enhancing the electromagnetic field intensity around nanoparticle volumes well below the light diffraction limit. These unique properties of nanoparticle plasmons play a leading role in a wide range of applications such as waveguiding 8−11 and light manipulation at the nanoscale, 12 optical trapping, 13 enhanced fluorescence, 14 single-molecule detection, and surface-enhanced Raman scattering (SERS). 15−18 Experimental access to the electromagnetic field distribution associated with nanoparticle SPs, with a sufficient degree of energy and spatial resolution, is of major importance in the

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mentioning

confidence: 69%

Plasmon Spectroscopy and Imaging of Individual Gold Nanodecahedra: A Combined Optical Microscopy, Cathodoluminescence, and Electron Energy-Loss Spectroscopy Study

Myroshnychenko¹,

et al. 2012

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“…The first one 32 consists of monodisperse equilateral 60 nm edge long, 30 nm thick nanoprisms deposited on a graphene sheet. The second one 31 consists of 80−200 nm edge long (and varying thickness) nanoprisms drop-casted on a thin carbon film. Such nanoparticles are chosen for their high crystallinity, which leads to well-defined resonances both in EELS 33 and CL, 34 and because the SP modes that dominate their optical response have been thoroughly discussed in the literature.…”

Section: −30mentioning

confidence: 99%

“…Gold triangular nanoprisms are synthesized using a seedmediated growth in aqueous media; 31,32 briefly, a small amount of iodide ions is exploited to guide the two-step growth of gold seeds stabilized by cetyltrymethilammonium chloride toward In the case of EELS, the spectra are first deconvolved and normalized. The CL and EELS images are generated by coloring each filtered maps of the data sets according to its energy, weighing each pixel of the maps by its intensity and summing all the resulting images.…”

Section: −30mentioning

confidence: 99%

Unveiling Nanometer Scale Extinction and Scattering Phenomena through Combined Electron Energy Loss Spectroscopy and Cathodoluminescence Measurements

et al. 2015

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Plasmon modes of the exact same individual gold nanoprisms are investigated through combined nanometer-resolved electron energy-loss spectroscopy (EELS) and cathodoluminescence (CL) measurements. We show that CL only probes the radiative modes, in contrast to EELS, which additionally reveals dark modes. The combination of both techniques on the same particles thus provides complementary information and also demonstrates that although the radiative modes give rise to very similar spatial distributions when probed by EELS or CL, their resonant energies appear to be different. We trace this phenomenon back to plasmon dissipation, which affects in different ways the plasmon signatures probed by these techniques. Our experiments are in agreement with electromagnetic numerical simulations and can be further interpreted within the framework of a quasistatic analytical model. We therefore demonstrate that CL and EELS are closely related to optical scattering and extinction, respectively, with the addition of nanometer spatial resolution.

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“…Since then, a plethora of studies have dealt with the production and characterization of noble metal colloids in a wide range of sizes [2][3][4], and for a variety of applications, including catalysis [5], biolabelling [6], biosensing [7], optical switches [8], among others. Only recently, variations in nanoparticle shape have been recognized as having a strong impact on their properties, which has motivated the development of synthetical methods for the preparation of particles with various geometries, such as rods [9][10][11][12][13], wires [14][15][16], prisms [17][18][19][20][21], cubes [22][23][24] and other polyhedrons [25,26].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Light Scattering of Short Au Rods with Low Aspect Ratios

et al. 2007

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The translational and rotational diffusion of a series of gold nanorods with low aspect ratio was investigated by dynamic light scattering (DLS). It is shown that the translational and the rotational diffusion coefficient can be determined because the particle shape causes an anisotropy of the polarizability. This gives rise to two clearly distinguishable relaxation modes in the time correlation function of the scattered light. The particle length and aspect ratio were determined independently by transmission electron microscopy (TEM). Using a hydrodynamic model, these geometrical parameters were converted to diffusion constants, which agree well with the values determined by DLS. Additionally it is possible to obtain an estimate of the particles aspect ratio from the amplitude ratio of the two relaxation modes.

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Synthesis and Optical Properties of Gold Nanodecahedra with Size Control

Cited by 354 publications

References 40 publications

Plasmon Spectroscopy and Imaging of Individual Gold Nanodecahedra: A Combined Optical Microscopy, Cathodoluminescence, and Electron Energy-Loss Spectroscopy Study

Plasmon Spectroscopy and Imaging of Individual Gold Nanodecahedra: A Combined Optical Microscopy, Cathodoluminescence, and Electron Energy-Loss Spectroscopy Study

Unveiling Nanometer Scale Extinction and Scattering Phenomena through Combined Electron Energy Loss Spectroscopy and Cathodoluminescence Measurements

Dynamic Light Scattering of Short Au Rods with Low Aspect Ratios

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