Optimizing Refractive Index Sensitivity of Supported Silver Nanocube Monolayers

Ahamad, Nur; Bottomley, Adam; Ianoul, Anatoli

doi:10.1021/jp207682s

Cited by 45 publications

(55 citation statements)

References 45 publications

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“…Nanocube substrates were prepared according to the procedure reported previously. 16 Briefly, NIMA 311D trough, filled with Milli Q water (18.2 MΩ cm) was used to prepare the Langmuir films of different NC samples. In order to form monolayers an appropriate amount of each sample was transferred into chloroform and deposited onto the surface of the water using a microsyringe.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

Reflection and Absorption Spectra of Silver Nanocubes on a Dielectric Substrate: Anisotropy, Angle, and Polarization Dependencies

Bottomley

Ianoul

2014

J. Phys. Chem. C

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Angle and polarization dependent UV−visible reflection and transmission spectra were measured for monolayers of weakly interacting silver nanocubes (of 40 and 80 nm edge lengths) supported by thin films of titanium oxide on glass utilizing both front and rear geometries with respect to the incident radiation. The supporting substrate mediates the hybridization of dipolar and quadrupolar plasmon resonances. From the spectra absolute extinction and absorption cross sections for supported silver nanocubes were determined. A strong angle dependence of the extinction and reflection spectra for p-but not s-polarized light was observed. This dependence is considerably more pronounced for the hybridized quadrupolar resonance of the 40 nm cubes. When illuminated from the rear, a significantly stronger absorption of light by the dipolar but not the quadrupolar resonance occurs for both cube sizes. Such absorption anisotropy could result from the wavelength dependent constructive or destructive interference between incident and scattered light from the nanocubes. This study demonstrates the impact of a dielectric substrate on the optical properties of novel plasmonic materials.

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Section: ■ Materials and Methodsmentioning

confidence: 99%

Reflection and Absorption Spectra of Silver Nanocubes on a Dielectric Substrate: Anisotropy, Angle, and Polarization Dependencies

Bottomley

Ianoul

2014

J. Phys. Chem. C

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“…As the nanocube approaches the glass substrate, the dipolar and the quadrupolar modes become more resolved. 30,36 Also shown are the field intensities of the hybrid quadrupolar (Q) mode and the dipolar (D) mode where the white horizontal line represents the substrate (Figure 1.9B, C). 33 These modes are spatially separated on the nanocube.…”

Section: Plasmonicsmentioning

confidence: 99%

Plasmonic Core/Half-Shell Nanoparticles: Exploring Half-Shell Growth for Gold, Titania, Silica and Cuprous Oxide onto Silver Nanocubes

Gale-Mouldey¹

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Core/shell nanoparticles have often been studied due to their attractive optical, electronic, and catalytic properties. By coupling these core/shell features with physical anisotropy of the shell -by selectively capping only a portion of the core -complex nanostructures with unique properties can be formed. This research investigates the synthesis and plasmonic properties of silver nanocube/metal and oxide core/shell nanoparticles with full or partial shells. The shell materials tested were gold, titania, silica, and cuprous oxide. The general method involved growing the shell on a silver nanocube (AgNC) that was partially embedded in a polystyrene thin-film supported by a glass substrate. The amount of shell coverage was dictated by the depth of embedding, and thus nanocube surface exposed and available for reaction. After in-solution shell growth, the particles were removed from the substrate and suspended in solution. The characterization of these particles by UV-vis spectroscopy and transmission electron microscopy confirmed their altered plasmonic properties and their morphology. This partial shell growth technique is ideal for any low temperature, two step core/shell synthesis. The resultant shells had quite distinct morphologies dependant on the shell material chosen. While the gold and titania shell growths are incomplete at this time, silica and cuprous oxide provided positive results. The AgNC/SiO2 core/shell nanoparticles exhibited a complete and conformal coverage of SiO2 due to undergrowth between the AgNC and the polystyrene. This undergrowth arises from mild etching of the silver during the silica growth, creating space for the silica precursor to penetrate between the core and the polymer thin-film. The AgNC/Cu2O core/shell nanoparticles formed had a distinct half-shell morphology with iv either pyramidal or cubic half-shells where the geometry of the shell is dependent upon the order of reagent addition. Furthermore, the cuprous oxide half-shells caused significant modifications to the localized surface plasmon resonance of the AgNC core and resulted in in-solution hybridization of the plasmon modes. The proposed core/half-shell morphology will be particularly advantageous in the formation of dimers for SERS sensing or as individual particles for catalysis. v

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“…Recently, it has been found that the interaction of "dark states" and "bright states" in metamaterial and plasmonic structures can also form Fano resonances [3][4][5][6]. Due to the sharp lineshape, a slight perturbation in local environment can cause a considerable change in transmission, reflection, or extinction spectrum [7], which is very helpful especially for applications such as sensor and modulator [8,9].…”

Section: Introductionmentioning

confidence: 99%

Sharp Fano Resonance within Bi-periodic Silver Particle Array and Its Application as Plasmonic Sensor with Ultra-high Figure of Merit

Zhao

Jiang

2014

Plasmonics

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In this research paper, a new type of Fano resonance originating from the far-field interference of lattice collective resonances of two sets of interlacing silver particle arrays with different radii is investigated numerically. The anti-phased collective resonance of the two arrays acts as "dark state", while the phased one serves as "bright state". The structure has the advantage to achieve both high modulation depth and sharp linewidth simultaneously, which is very attractive for plasmonic sensor, and the sensitivity and figure of merit can reach as high as 633 nm/RIU and 2000, respectively. Also, the structure has the merit of high Q factor up to 320.

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Optimizing Refractive Index Sensitivity of Supported Silver Nanocube Monolayers

Cited by 45 publications

References 45 publications

Reflection and Absorption Spectra of Silver Nanocubes on a Dielectric Substrate: Anisotropy, Angle, and Polarization Dependencies

Reflection and Absorption Spectra of Silver Nanocubes on a Dielectric Substrate: Anisotropy, Angle, and Polarization Dependencies

Plasmonic Core/Half-Shell Nanoparticles: Exploring Half-Shell Growth for Gold, Titania, Silica and Cuprous Oxide onto Silver Nanocubes

Sharp Fano Resonance within Bi-periodic Silver Particle Array and Its Application as Plasmonic Sensor with Ultra-high Figure of Merit

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