Controlling the Topography and Surface Plasmon Resonance of Gold Nanoshells by a Templated Surfactant-Assisted Seed Growth Method

Sánchez-Gaytán, Brenda L.; Qian, Zhaoxia; Hastings, Simon P.; Reca, Michael L.; Fakhraai, Zahra; Park, Soo‐Young

doi:10.1021/jp401189k

Cited by 52 publications

(91 citation statements)

References 32 publications

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“…As described in our previous publications [30][31][32][33], spiky nanoshells were produced using a surfactant-assisted seed growth method. The nanoshells used in this study have a polystyrene core with a diameter of 95 nm, with spikes estimated to be less than 68 nm in length.…”

Section: Synthesis and Dark Field Microscopymentioning

confidence: 99%

“…FDTD simulations were performed using Lumerical Solutions inc.'s FDTD package (versions 8.6 and 8.7) as previously described [31][32][33]. The simulation boundary conditions were set to Perfectly Matched Layers (PML), and a Total-Field Scattered-Field (TFSF) source was used to inject a plane wave into the simulation.…”

Section: Finite Difference Time Domain (Fdtd) Simulationsmentioning

confidence: 99%

“…The material properties of gold originated from the CRC Handbook [34], while an ellipsometry measurement was used to determine the optical properties of polystyrene, as in previous work [32,33].The height, tip diameter, and cone angles were randomized with ranges 50 nm -65 nm, 2 nm -6 nm, and 30 • -75 • , respectively.…”

Section: Finite Difference Time Domain (Fdtd) Simulationsmentioning

confidence: 99%

“…Spiky nanoshells are composed of randomly sized sharp gold spikes decorating the surface of a polystyrene core [30], and have tunable dipolar resonances in the visible and near-IR range [30][31][32]. It has been recently demonstrated that the disorder in these nanoshells generates spectrally and spatially broad dark quadrupole modes that enable highly efficient and reproducible Quadrupole Enhanced Raman Scattering(QERS) on a single particle level [33].…”

Section: Introductionmentioning

confidence: 99%

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Modal interference in spiky nanoshells

Hastings¹,

Qian²,

Swanglap³

et al. 2015

Opt. Express

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Near-field enhancement of the electric field by metallic nanostructures is important in non-linear optical applications such as surface enhanced Raman scattering. One approach to producing strong localization of the electric field is to couple a dark, non-radiating plasmonic mode with a broad dipolar resonator that is detectable in the far-field. However, characterizing or predicting the degree of the coupling between these modes for a complicated nanostructure can be quite challenging. Here we develop a robust method to solve the T-matrix, the matrix that predicts the scattered electric fields of the incident light, based on finite-difference time-domain (FDTD) simulations and least square fitting algorithms. This method allows us to simultaneously calculate the T-matrix for a broad spectral range. Using this method, the coupling between the electric dipole and quadrupole modes of spiky nanoshells is evaluated. It is shown that the built-in disorder in the structure of these nanoshells allows for coupling between the dipole modes of various orientations as well as coupling between the dipole and the quadrupole modes. A coupling strength of about 5% between these modes can explain the apparent interference features observed in the single particle scattering spectrum. This effect is experimentally verified by single particle backscattering measurements of spiky nanoshells. The modal interference in disordered spiky nanoshells can explain the origin of the spectrally broad quadrupole resonances that result in strong Quadrupole Enhanced Raman Scattering (QERS) in these nanoparticles.

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Section: Synthesis and Dark Field Microscopymentioning

confidence: 99%

Section: Finite Difference Time Domain (Fdtd) Simulationsmentioning

confidence: 99%

Section: Finite Difference Time Domain (Fdtd) Simulationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Modal interference in spiky nanoshells

Hastings¹,

Qian²,

Swanglap³

et al. 2015

Opt. Express

Self Cite

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“…As the aspect ratio increases, the HGNs will absorb longer wavelengths of light [66,83,118,119]. For a fixed core diameter, decreasing the volume of the gold salt delivered produces a thinner shell and red-shifted absorption whereas a constant shell thickness and a decreasing core diameter produce blue-shifted SPR [66,83,120,121]. Fig.…”

Section: Tuning Lspr To the Nirmentioning

confidence: 98%

Controllable Cobalt Oxide/Au Hierarchically Nanostructured Electrode for Nonenzymatic Glucose Sensing

2016

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By electrodeposition and galvanic replacement reaction, we developed a facile, time-saving, cost-effective, and environmentally friendly, two-step synthesis route to obtain a controllable cobalt oxide/Au hierarchically nanostructured electrode for glucose sensing. The nanomaterials were characterized by transmission electron microscopy, scanning electron microscopy, Raman spectroscopy, energy-dispersive spectrometry, and X-ray photoelectron spectroscopy, meanwhile, the sensing performance was investigated by cyclic voltammetry and amperometric response. The results revealed that this novel electrode exhibited excellent electrocatalytic performance toward glucose oxidation, with a wide double-linear range from 0.2 μM to 20 mM and a low detection limit of 0.1 μM based on a signal-to-noise ratio of 3, which was mainly attributed to the ability of loading a small amount of Au with good electron conductivity on the surface of cobalt oxide nanosheets with large active surface area and synergistic electrocatalytic activity of Au and cobalt oxide toward glucose electrooxidation. This facile, sensitive, and selective glucose sensor is also proven to be suitable for the detection of glucose in human serum.

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Chemical Control of Plasmons in Metal Chalcogenide and Metal Oxide Nanostructures

et al. 2015

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The field of plasmonics has grown to impact a diverse set of scientific disciplines ranging from quantum optics and photovoltaics to metamaterials and medicine. Plasmonics research has traditionally focused on noble metals; however, any material with a sufficiently high carrier density can support surface plasmon modes. Recently, researchers have made great gains in the synthetic (both intrinsic and extrinsic) control over the morphology and doping of nanoscale oxides, pnictides, sulfides, and selenides. These synthetic advances have, collectively, blossomed into a new, emerging class of plasmonic metal chalcogenides that complement traditional metallic materials. Chalcogenide and oxide nanostructures expand plasmonic properties into new spectral domains and also provide a rich suite of chemical controls available to manipulate plasmons, such as particle doping, shape, and composition. New opportunities in plasmonic chalcogenide nanomaterials are highlighted in this article, showing how they may be used to fundamentally tune the interaction and localization of electromagnetic fields on semiconductor surfaces in a way that enables new horizons in basic research and energy-relevant applications.

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Controlling the Topography and Surface Plasmon Resonance of Gold Nanoshells by a Templated Surfactant-Assisted Seed Growth Method

Cited by 52 publications

References 32 publications

Modal interference in spiky nanoshells

Modal interference in spiky nanoshells

Controllable Cobalt Oxide/Au Hierarchically Nanostructured Electrode for Nonenzymatic Glucose Sensing

Chemical Control of Plasmons in Metal Chalcogenide and Metal Oxide Nanostructures

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